[Objective] The paper was to construct soil erosion control and circular agriculture mode in hilly red soil of southern China, and analyze its application effort. [Method] The cause of soil erosion in hilly red soil o...[Objective] The paper was to construct soil erosion control and circular agriculture mode in hilly red soil of southern China, and analyze its application effort. [Method] The cause of soil erosion in hilly red soil of southern China and the reason for long-term treatment without remarkable effort were analyzed. On this basis, the key technology, economic benefit, ecological service function and carbon sequestration sink enhancement effect of various modes were further analyzed. [Result] The basic idea for comprehensive control of hilly soil erosion in southern China was as follows: the control of soil erosion was combined with modern agricultural production, in order to build "fruit(tea)-grass-livestock-methane" circular agriculture mode with comprehensive control of soil erosion; application effect analysis showed that the establishment of circular agriculture mode in southern hilly area to control soil erosion had remarkable effect, which could simultaneously meet the coordinated development of ecological, economic and social benefits. [Conclusion] This study established an effective mode suitable for soil erosion control and agricultural protection development in southern red soil mountain, which could drive the sustainable development of ecological restoration of mountainous area and rural agricultural economy.展开更多
The capacity of soil and water conservation measures, defined as the maximum quantity of suitable soil and water conservation measures contained in a region, were determined for the Loess Plateau based on zones suitab...The capacity of soil and water conservation measures, defined as the maximum quantity of suitable soil and water conservation measures contained in a region, were determined for the Loess Plateau based on zones suitable for establishing terraced fields, forestland and grassland with the support of geographic information system(GIS) software. The minimum possible soil erosion modulus and actual soil erosion modulus in 2010 were calculated using the revised universal soil loss equation(RUSLE), and the ratio of the minimum possible soil erosion modulus under the capacity of soil and water conservation measures to the actual soil erosion modulus was defined as the soil erosion control degree. The control potential of soil erosion and water loss in the Loess Plateau was studied using this concept. Results showed that the actual soil erosion modulus was 3355 t·km^(–2)·a^(–1), the minimum possible soil erosion modulus was 1921 t·km^(–2)·a^(–1), and the soil erosion control degree was 0.57(medium level) in the Loess Plateau in 2010. In terms of zoning, the control degree was relatively high in the river valley-plain area, soil-rocky mountainous area, and windy-sandy area, but relatively low in the soil-rocky hilly-forested area, hilly-gully area and plateau-gully area. The rate of erosion areas with a soil erosion modulus of less than 1000 t·km^(–2)·a^(–1) increased from 50.48% to 57.71%, forest and grass coverage rose from 56.74% to 69.15%, rate of terraced fields increased from 4.36% to 19.03%, and per capita grain available rose from 418 kg·a^(–1) to 459 kg·a^(–1) under the capacity of soil and water conservation measures compared with actual conditions. These research results are of some guiding significance for soil and water loss control in the Loess Plateau.展开更多
Wind erosion is a major cause of land desertification and sandstorm formation in arid and semi-arid areas.The objective of this study was to evaluate the potential of soybeans crude extract induced calcium carbonate p...Wind erosion is a major cause of land desertification and sandstorm formation in arid and semi-arid areas.The objective of this study was to evaluate the potential of soybeans crude extract induced calcium carbonate precipitation(SICP)on reducing wind erosion risk of sandy soil.Field tests were carried out in Ulan Buh Desert,Ningxia Hui Autonomous Region,China.Results showed that the SICP method could significantly enhance the surface strength and wind erosion resistance of the topsoil.The optimal cementation solution(urea-CaCl2)concentration and spraying volume,according to experiments conducted on sandy land,were 0.2 mol/L and 4 L/m^2,respectively.Under this condition,the CaCO3 content was approximately 0.45%,the surface strength of sandy soil could reach 306.2 kPa,and the depth of wind erosion was approximately zero,after 30 d completion of SICP treatment.Soil surface strength declined with the increase of time,and long-term sand fixation effects of SICP treatment varied depending on topography.Whereas wind erosion in the top area of the windward slope was remarkable,sandy soils on the bottom area of the windward slope still maintained a relatively high level of surface strength and a low degree of wind erosion 12 month after SICP treatment.Scanning electron microscopy(SEM)tests with energy dispersive X-ray(EDX)confirmed the precipitation of CaCO3 and its bridge effect.These findings suggested that the SICP method is a promising candidate to protect sandy soil from wind erosion in desert areas.展开更多
The China Loess Plateau is subjected to severe soil erosion triggered by intense rainfall,resulting in significant harm and losses to both human society and the natural surroundings.In this study,a novel technique for...The China Loess Plateau is subjected to severe soil erosion triggered by intense rainfall,resulting in significant harm and losses to both human society and the natural surroundings.In this study,a novel technique for managing loess erosion is introduced,which involves the utilization of a combined polymer SH and ryegrass.A comprehensive series of tests were undertaken,including rainfall erosion tests,disintegration experiments,and scanning electron microscopy examinations,to assess the accumulative sediment yield(ASY),disintegration ratio,and microstructural features of both untreated and treated loess samples.The results showed a significant reduction in ASY with increased dry density of untreated loess.Furthermore,the combined technique effectively controlled erosion,limiting ASY to 266.2 g/cm^(2)in 60 minutes.This was approximately one-sixth,one-ninth,and one-fifteenth of the ASY in SH-treated loess(L-SH),ryegrass-treated loess(L-R),and untreated loess,respectively.It resisted disintegration better than ryegrass alone but slightly less than SH.This improvement was due to the combined effect of SH and ryegrass,which reduced raindrop impact,improved loess microstructure,and boosted ryegrass growth.The innovative technique holds the potential to be applied as a field-scale technique in the Loess Plateau region of China.展开更多
To investigate the effects of various erosion control measures on mountain floods, a case study was conducted in Censhui River South Branch Watershed using scenario analysis and soil conservation service （SCS） metho...To investigate the effects of various erosion control measures on mountain floods, a case study was conducted in Censhui River South Branch Watershed using scenario analysis and soil conservation service （SCS） methods. A distributed hydrological model was developed, and watershed parameters were determined based on satellite imagery, digital terrain models, digital maps and field investigations. Two types of erosion control measures were investigated： the variation of vegetation covers and the change of cultivation techniques. Seven scenarios were considered for the test watershed. The results show： （1） while the de-vegetation results in the increase of peak discharge, the improve of vegetation covers decreases peak discharge at watershed scale; （2） by both improving vegetation cover and enhancing terrace-cultivation technology, the peak discharge is reduced and the peak flow arrival time is delayed; （3） attention should be attached to both early warning system and measures changing the underlying surface and conveyance systems.展开更多
The study investigated farmers＇ perception of soil erosion control measures and highlighted implications for sustainable development in agriculture and environment in southeast, Nigeria. Purposive, multistage and ran...The study investigated farmers＇ perception of soil erosion control measures and highlighted implications for sustainable development in agriculture and environment in southeast, Nigeria. Purposive, multistage and random sampling techniques were employed in selecting a sample size of two hundred and forty （240） respondents. Structured interview schedule was used for data collection, while percentages, mean ratings and factor analysis techniques were employed for analysis. The findings show that majority （64.6%） of farmers were within the ages of 40-59, while majority （67.9%） had either FSLC or WASCE/SSCE/GCE/OL qualifications. The farmers reported that the major soil erosion control measures used were strip cropping （M = 4.8） and making of ridges against slopes （M = 4.7）. The study reported that poor group affinity, inadequate institutional support and inadequate technical knowhow were constraints to soil erosion control in southeast, Nigeria. The study highlighted implications for sustainable development in agriculture and environment on organizational overhaul in extension, participatory extension policy on farmers groups and institutional re-orientation and synergy between Universities, Agricultural Development Programme （ADP）, Ministry of Agriculture （MOA） and Local Government Councils. In conclusion, success in soil erosion control and sustainable development in agriculture and environment in southeast, Nigeria depends on the extent issues raised and implications highlighted can be addressed. The study recommends improved funding support to extension, participatory extension training and contacts with farmers＇ groups and groups＇ resources management.展开更多
While soils are as essential to human society as air and water,soil degradation has not received nearly as much attention as the threats to these other elements.On the map of water erosion of Europe,Southern Europe is...While soils are as essential to human society as air and water,soil degradation has not received nearly as much attention as the threats to these other elements.On the map of water erosion of Europe,Southern Europe is red"colored".Erosion in the Balkan countries,through both on and offsite effects is a major cause of soil and water degradation.This paper compares erosion control works in several countries from the Balkan region(Macedonia,Serbia,and Bulgaria).The basis for comparative analyses was various country reports as well as available published papers.Quantitative method-text analyze method was used for these study.Natural conditions in the Balkan countries contribute to the appearance of various erosion forms and the intensity of the erosion processes.Over the history of these countries,people who settled this region used the available natural resources to fill their needs(tree cutting,incorrect plugging,overgrazing),which contributed to soil erosion.Organized erosion control works in the Balkans started in the beginning of the 20th century(1905 in Bulgaria).The highest intensity of erosion control works were carried out during the period 1945-1990.Various erosion control works were launched.Bulgaria had a large anti-erosion afforestation,almost 1 million ha.Bulgaria's ecological river restoration approach has been in use for almost 50 years.Serbia contributed significant erosion and torrent control works on hilly agricultural areas.Specific screen barrages and afforestation on extremely dry areas are characteristic in Macedonia.A common characteristic for all countries is a high decrease in erosion control works in the last 20 years.展开更多
Vegetation plays a major role in soil protection against erosion effects,and studies have also highlighted its importance in retaining sediments from roadside slopes.Yet,hydro-sedimentological studies under natural pr...Vegetation plays a major role in soil protection against erosion effects,and studies have also highlighted its importance in retaining sediments from roadside slopes.Yet,hydro-sedimentological studies under natural precipitation conditions are still scarce in semi-arid areas due to difficulties in monitoring the few and very concentrated precipitation events.Quantifying sediment connectivity and yield at watershed scale,often highly impacted by the erosion of unpaved roads,is necessary for management plans.This study aims to evaluate the efficiency of native vegetation on roadside slope segments in Caatinga biome in retaining sediments and conserving the soil in a semi-arid area of Brazil.Surface runoff,sediment concentration,and yield measurements were measured from 34 natural precipitation events in four years on two slopes with and without vegetation.The runoff coefficients of the plot with no vegetation varied from 3.0%to 58.0%,while in the vegetated plot,they showed variation from 1.0%to 21.0%.The annual specific sediment yield ranged from 4.6 to 138.7 kg/(hm^(2)•a)for the vegetated plot and from 34.9 to 608.5 kg/(hm^(2)•a)for the unvegetated one.These results indicate a 4 to 12 times higher soil loss on the unvegetated slope in relation to the vegetated one and demonstrate that natural Caatinga vegetation acts as an effective barrier against surface-transported sediments.Moreover,natural Caatinga vegetation present on the slope plays an important role in breaking connectivity between sediment flows from unpaved roads and the watershed drainage system.These findings indicate that investments in unpaved road and roadside slope restoration,not only enhance road infrastructure but also promote environmental gains by reducing the impact of erosion.展开更多
Severe soil erosion in the middle and upper reaches of Yangtze River has been regarded as a major environmental problem. The on-site impact of soil erosion on agricultural production and the off-site impact on floods ...Severe soil erosion in the middle and upper reaches of Yangtze River has been regarded as a major environmental problem. The on-site impact of soil erosion on agricultural production and the off-site impact on floods and sedimentation in Yangtze Rive are well known. A quantitative assessment of soil erosion intensity is still scanty for developing appropriate soil erosion control measures for different land use types and zones in this region. This article constructs a localized USLE and estimates the average soil loss in the Jinsha River Region in Yunnan Province, one of the priority areas for soil erosion control in the middle and upper reaches of Yangtze River. The estimation is done under different land uses and zones in this basin. The estimation shows that while soil erosion in the cultivated land is the most severe, 36～40% of the garden and forest land suffers from soil erosion of various degrees due to lack of ground cover and other factors. Soil erosion in the pasture is modest when the ground cover is well maintained. It also confirmed that terracing can reduce soil erosion intensity significantly on the cultivated land. Research findings suggest that sufficient attention must be paid to regeneration of the ground cover in reforestation programs. In addition to mass reforestation efforts, restoration of grassland and terracing of the cultivated land should also play an important role in erosion control.展开更多
The unique geomorphological features and farming methods in the Mollisol region of Northeast China increase water catchment flow and aggravate the erosion of ephemeral gully(EG).Vegetation suffers from rain erosion an...The unique geomorphological features and farming methods in the Mollisol region of Northeast China increase water catchment flow and aggravate the erosion of ephemeral gully(EG).Vegetation suffers from rain erosion and damage during the growth stage,which brings serious problems to the restoration of grass in the early stage.Therefore,effects of coir geotextile and geocell on EG erosion under four confluence intensities were researched in this study.Results of the simulated water discharge erosion test showed that when the confluence strength was less than 30 L/min,geocell and coir geotextile had a good effect on controlling EG erosion,and sediment yield of geocell and coir geotextile was reduced by 25.95%–37.82%and 73.73%–88.96%,respectively.However,when confluence intensity increased to 40 L/min,protective effect of coir geotextile decreased,and sediment yield rate increased sharply by 189.03%.When confluence intensity increased to 50 L/min,the protective effect of coir geotextile was lost.On the other hand,geocell showed that the greater the flow rate,the better the protective effect.In addition,with the increase in confluence intensity,erosion pattern of coir geotextile developed from sheet erosion to intermittent fall and then to completion of main rill,and the protective effect was gradually weakened.In contrast,the protective effect of EG under geocell was gradually enhanced from the continuous rill to the intermittent rill and finally to the intermittent fall.This study shows that coir geotextile and geocell can prevent EG erosion,and the effect of geocell is better than that of coir geotextile on the surface of EG.展开更多
Soil erosion from chestnut forests has many types and intensities. However, less attention has been paid to the increasing soil erosion in the chestnut forests of Yanshan Mountains region, North China. The objective o...Soil erosion from chestnut forests has many types and intensities. However, less attention has been paid to the increasing soil erosion in the chestnut forests of Yanshan Mountains region, North China. The objective of this study was to discuss forest ages(<5, 5~<10, 10~<20, and 20~ yr), slopes(5°~<15°, 15°~<25°, 25°~<35°, and 35°~), slope positions(upslope, midslope, downslope, and whole slope), and slope aspects(sunny, half-sunny, shade, and half-shade) effects on soil erosion types and intensities in chestnut forests. A field survey was applied to investigate in detail the contiguous chestnut forests near Changfu village of Hebei Province, China on October 9-30, 2016. Results showed that chestnut forests are dominated by moderate erosion in this region, and the soil erosionfrom chestnut forests tended to deteriorate gradually. The average land degradation index was 0.31. The erosion intensity from chestnut forests will gradually increase with the year of planting. Most of the slopes are greater than 15°, accounting for 86.7% of the total chestnut forests. Most of the chestnut forests occupy the whole slope, accounting for 47.5% of the total area. Moderate erosion occurs most commonly for different slope aspects. In conclusion, improving the preparation efficiency of chestnut forests and enhancing the construction standards of soil and water conservation measures would be useful measures to avoid soil erosion from chestnut forests reaching a more severe level.展开更多
Wind erosion is one of the significant natural calamities worldwide, which degrades around one-third of global land. The eroded and suspended soil particles in the environment may cause health hazards, i.e.allergies a...Wind erosion is one of the significant natural calamities worldwide, which degrades around one-third of global land. The eroded and suspended soil particles in the environment may cause health hazards, i.e.allergies and respiratory diseases, due to the presence of harmful contaminants, bacteria, and pollens.The present study evaluates the feasibility of microbially induced calcium carbonate precipitation(MICP)technique to mitigate wind-induced erosion of calcareous desert sand(Thar desert of Rajasthan province in India). The temperature during biotreatment was kept at 36℃ to stimulate the average temperature of the Thar desert. The spray method was used for bioaugmentation of Sporosarcina(S.) pasteurii and further treatment using chemical solutions. The chemical solution of 0.25 pore volume was sprayed continuously up to 5 d, 10 d, 15 d, and 20 d, using two different concentration ratios of urea and calcium chloride dihydrate viz 2:1 and 1:1. The biotreated samples were subjected to erosion testing(in the wind tunnel) at different wind speeds of 10 m/s, 20 m/s, and 30 m/s. The unconfined compressive strength of the biocemented crust was measured using a pocket penetrometer. The variation in calcite precipitation and microstructure(including the presence of crystalline minerals) of untreated as well as biotreated sand samples were determined through calcimeter, scanning electron microscope(SEM), and energydispersive X-ray spectroscope(EDX). The results demonstrated that the erosion of untreated sand increases with an increase in wind speeds. When compared to untreated sand, a lower erosion was observed in all biocemented sand samples, irrespective of treatment condition and wind speed. It was observed that the sample treated with 1:1 cementation solution for up to 5 d, was found to effectively resist erosion at a wind speed of 10 m/s. Moreover, a significant erosion resistance was ascertained in15 d and 20 d treated samples at higher wind speeds. The calcite content percentage, thickness of crust,bulk density, and surface strength of biocemented sand were enhanced with the increase in treatment duration. The 1:1 concentration ratio of cementation solution was found effective in improving crust thickness and surface strength as compared to 2:1 concentration ratio of cementation solution. The calcite crystals formation was observed in SEM analysis and calcium peaks were observed in EDX analysis for biotreated sand.展开更多
Gully erosion,an integrated result of various social and environmental factors,is a severe problem for sustainable development and ecology security in southern China.Cur-rently,the dominant driving forces on gully dis...Gully erosion,an integrated result of various social and environmental factors,is a severe problem for sustainable development and ecology security in southern China.Cur-rently,the dominant driving forces on gully distribution are shown to vary at different spatial scales.However,few systematic studies have been performed on spatial scaling effects in identifying driving forces for gully erosion.In this study,we quantitatively identified the de-terminants of gully distribution and their relative importance at four different spatial scales(southern China,Jiangxi province,Ganxian county,and Tiancun township,respectively)based on the Boruta algorithm.The optimal performance of gully susceptibility mapping was investigated by comparing the performance of the multinomial logistic regression(MLR),lo-gistic model tree(LMT),and random forest(RF).Across the four spatial scales,the total contributions of gully determinants were classified as lithology and soil(32.65%)≥topogra-phy(22.40%)>human activities(22.31%)>climate(11.32%)>vegetation(11.31%).Among these factors,precipitation(7.82%),land use and land cover(6.16%),rainfall erosivity(10.15%),and elevation(11.59%)were shown to be the predominant factors for gully erosion at the individual scale of southern China,province,county,and township,respectively.In addition,contrary to climatic factors,the relative importance of soil properties and vegetation increased with the decrease of spatial scale.Moreover,the RF model outperformed MLR and LMT at all the investigated spatial scales.This study provided a reference for factor selection in gully susceptibility modeling and facilitated the development of gully erosion management strategies suitable for different spatial scales.展开更多
Mountainous regions of the globe experience landslides due to heavy rainfall and unplanned construction on slopes.Geojute is adopted globally as a landslide rehabilitation measure,but its impact on natural vegetation ...Mountainous regions of the globe experience landslides due to heavy rainfall and unplanned construction on slopes.Geojute is adopted globally as a landslide rehabilitation measure,but its impact on natural vegetation development is poorly understood.The present study was conducted to examine the impact of geojute application on vegetation restoration,ecology and carbon stock in a recently occurred landslide,during 2012.The results revealed that the geojute application improved the richness,diversity,density and basal area of plant species at the landslide site.Likewise,biomass production,carbon stock and carbon sequestration of plant species was observed significantly higher in geojute treatments compared to control(without geojute treatment).Moreover,significant improvement in soil moisture was recorded beneath the geojute treatments.Further,results showed that the geojute is highly effective in controlling soil erosion at the landslide site.The findings of this study revealed ecological and environmental benefits of geojute application in term of improvement in vegetation recovery processes,species diversity and carbon sequestration at the landslide site.The scientific outcome of this study can be helpful for planning the rehabilitation measures in landslide affected regions of the globe.展开更多
Recent studies show an increase in the population of beavers, nutria and other rodents in vast regions of central Europe over the last 15 years. Unfortunately, this caused in many instances considerable damage on larg...Recent studies show an increase in the population of beavers, nutria and other rodents in vast regions of central Europe over the last 15 years. Unfortunately, this caused in many instances considerable damage on large rivers along dykes and earthworks in the floodplain areas, leading to an increased risk of bank failures. However, most of these mammals belong to protected species. This work is aimed at showing positive experience in cooperation with universities, research institutes and environmental agencies regarding measures to permanently safeguard the banks using composite erosion control systems with polymer coated steel wire net （as flexible reinforcement component） and a geosynthetic （to promote vegetation growth）. The steel mesh component works as an effective long-term barrier against the intrusion of mammals, discouraging them from digging inside the core of the dyke. An analysis of the sensitive areas to be protected led also to definition of the characteristics of these interventions （length, shape, escape ways, population areas, etc.）. The study will present several additional benefits when using polymer steel nets along dykes, such as： high and durable erosion protection in overflow areas, promotion of fast and effective vegetation growth （increasing stability）, surface protection against ice impacts （in northern regions）, ease of installation, maintenance, ability to conform to irregular shapes of the slope. This work will also present the positive outcome of research studies along dykes in Germany, Austria and in Italy.展开更多
Vegetation-erosion dynamics is a new interdisciplinary science,studying the laws of evolution of watershed vegetation under the action of various ecological stresses.Introducing a qualitative expression of ecological ...Vegetation-erosion dynamics is a new interdisciplinary science,studying the laws of evolution of watershed vegetation under the action of various ecological stresses.Introducing a qualitative expression of ecological stresses in this paper,the present authors establish the cou-pled differential equations for the vegetation-erosion process and derive a theoretical solution.The model is applied to the Anjiagou watershed on the Loess Pateau and the Xiaojiang water-shed and its sub-watersheds on the Yunnan Plateau.The calculated results agree well with the vegetation development processes.Abstracted from the differential equations the so-called vegetation-erosion chart is worked out,with which we can predict the development trend of vegetation under no human stresses.It is demonstrated that the erosion control is important for vegetation development and reforestation must be a long-term strategy.On the Yunnan Plateau with relatively high precipitation and temperature,vegetation can be greatly improved if erosion is controlled.On the dry and cold Loess Pateau suffering from high rate of soil erosion,however,vegetation can effectively control erosion but erosion reduction exhibits low effectiveness on vegetation development.Vegetation in the area is not stable and management is always needed to maintain the vegetation.展开更多
Green roofs are exposed to high winds and harsh environmental conditions that can degrade vegetation and erode substrate material,with negative consequences to ecosystem services.Biochar has been promoted as an effect...Green roofs are exposed to high winds and harsh environmental conditions that can degrade vegetation and erode substrate material,with negative consequences to ecosystem services.Biochar has been promoted as an effective substrate additive to enhance plant performance,but unprocessed biochars are susceptible to wind and water erosion.Applications of granulated biochars or chemical dust suppressants are suggested as a means to mitigate biochar and substrate erosion;however,research on biochar type and chemical dust suppressant use on biochar and substrate erosion is lacking.Vegetation is a crucial factor that influences substrate erosion,yet plant responses may vary with biochar type and chemical dust suppressant;thus,the effects of possible mitigation measures on biochar and substrate erosion are unclear.We investigated the effects of surface-applied granulated and unprocessed biochars and an organic dust suppressant(Entac™)on biochar and substrate erosion on green roofs with Sedum album L.and a native plant mix.Our results show that 94%of unprocessed biochars were lost from green roofs after 2 years regardless of the Entac™amendment,likely due to the lightweight nature and fragmentation of biochar particles.In contrast,granulation of biochars reduced the biochar erosion and total substrate erosion by 74%and 39%,respec-tively,possibly due to enhanced biochar bulk density and particle size and improved moisture retention of biochar-amended substrates.Additionally,Sedum album better reduced biochar and substrate erosion than the native plant mix,likely due to rapid development of high vegetation cover that reduced wind exposure and enhanced substrate moisture retention.We conclude that applications of granulated biochars can substantially reduce biochar and sub-strate erosion on green roofs,improving green roof sustainability.展开更多
Dear Editor,American sloughgrass(Beckmannia syzigachne[Steud.]Fernald)(2n=14)(Amosova et al.,2019),a diploid species within the Poaceae family,exhibits both annual and perennial life cycles and is self-pollinating.It ...Dear Editor,American sloughgrass(Beckmannia syzigachne[Steud.]Fernald)(2n=14)(Amosova et al.,2019),a diploid species within the Poaceae family,exhibits both annual and perennial life cycles and is self-pollinating.It is widely distributed throughout Eastern Asia,Western Europe,and North America(https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:30332-2),playing a crucial role in both natural ecosystems and agricultural settings.B.syzigachne is important for wetland restoration and erosion control but also poses significant challenges as a weed in agricultural systems,particularly in rice–wheat and rice–rapeseed double-cropping systems(Qu et al.,2021).Understanding the genetic elements underpinning B.syzigachne’s adaptation to diverse environments is crucial for studying traits like herbicide resistance and stress tolerance,which are key to enhancing agricultural efficiency and promoting sustainable cropping practices.However,the lack of a reference genome has impeded progress in this area.More broadly,the International Weed Genomics Consortium is advancing genomic tools to advance sustainable weed control and provide insights into stress tolerance,potentially benefiting crop breeding(Montgomery et al.,2024).展开更多
Nearly forty years after the Clean Water Act(CWA)was passed,we’ve come a long way in our understanding of the strength and fragility of our water resources and the impact that our actions or inactions can have on the...Nearly forty years after the Clean Water Act(CWA)was passed,we’ve come a long way in our understanding of the strength and fragility of our water resources and the impact that our actions or inactions can have on them.Though regulatory systems are in place and best management practices(BMPs)are plentiful,successfully managing risk in environmental compliance remains a constant concern.Fortunately,the rules to environmental compliance are simple:half of it is paperwork and the other half is maintenance.If you take an organized and balanced approach to compliance,you should be able to keep risk at bay and avoid enforcement action.However,remember that no matter how thoroughly you prepare for a construction project,you may still encounter unexpected situations requiring environmental knowledge and understanding.As you start to plan your operation,you should take the time to stop and consider the risk associated with your project.The Environmental Protection Agency(EPA)considers risk to be“the chance of harmful effects to human health or to ecological systems resulting from exposure to the environmental stressor.”The“stressors”are a variety of physical,chemical,or biological activities that can cause negative reactions to ecosystems and the environment.1 In order to limit,and hopefully prevent,risky situations,the key is to assess and target the problems that could arise and then implement a system of metrics that help with prevention.展开更多
文摘[Objective] The paper was to construct soil erosion control and circular agriculture mode in hilly red soil of southern China, and analyze its application effort. [Method] The cause of soil erosion in hilly red soil of southern China and the reason for long-term treatment without remarkable effort were analyzed. On this basis, the key technology, economic benefit, ecological service function and carbon sequestration sink enhancement effect of various modes were further analyzed. [Result] The basic idea for comprehensive control of hilly soil erosion in southern China was as follows: the control of soil erosion was combined with modern agricultural production, in order to build "fruit(tea)-grass-livestock-methane" circular agriculture mode with comprehensive control of soil erosion; application effect analysis showed that the establishment of circular agriculture mode in southern hilly area to control soil erosion had remarkable effect, which could simultaneously meet the coordinated development of ecological, economic and social benefits. [Conclusion] This study established an effective mode suitable for soil erosion control and agricultural protection development in southern red soil mountain, which could drive the sustainable development of ecological restoration of mountainous area and rural agricultural economy.
基金National Natural Science Foundation of China,No.41401305,No.41330858The Open Foundation of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,No.K318009902-14
文摘The capacity of soil and water conservation measures, defined as the maximum quantity of suitable soil and water conservation measures contained in a region, were determined for the Loess Plateau based on zones suitable for establishing terraced fields, forestland and grassland with the support of geographic information system(GIS) software. The minimum possible soil erosion modulus and actual soil erosion modulus in 2010 were calculated using the revised universal soil loss equation(RUSLE), and the ratio of the minimum possible soil erosion modulus under the capacity of soil and water conservation measures to the actual soil erosion modulus was defined as the soil erosion control degree. The control potential of soil erosion and water loss in the Loess Plateau was studied using this concept. Results showed that the actual soil erosion modulus was 3355 t·km^(–2)·a^(–1), the minimum possible soil erosion modulus was 1921 t·km^(–2)·a^(–1), and the soil erosion control degree was 0.57(medium level) in the Loess Plateau in 2010. In terms of zoning, the control degree was relatively high in the river valley-plain area, soil-rocky mountainous area, and windy-sandy area, but relatively low in the soil-rocky hilly-forested area, hilly-gully area and plateau-gully area. The rate of erosion areas with a soil erosion modulus of less than 1000 t·km^(–2)·a^(–1) increased from 50.48% to 57.71%, forest and grass coverage rose from 56.74% to 69.15%, rate of terraced fields increased from 4.36% to 19.03%, and per capita grain available rose from 418 kg·a^(–1) to 459 kg·a^(–1) under the capacity of soil and water conservation measures compared with actual conditions. These research results are of some guiding significance for soil and water loss control in the Loess Plateau.
基金Projects(51978244,51979088,51608169)supported by the National Natural Science Foundation of China。
文摘Wind erosion is a major cause of land desertification and sandstorm formation in arid and semi-arid areas.The objective of this study was to evaluate the potential of soybeans crude extract induced calcium carbonate precipitation(SICP)on reducing wind erosion risk of sandy soil.Field tests were carried out in Ulan Buh Desert,Ningxia Hui Autonomous Region,China.Results showed that the SICP method could significantly enhance the surface strength and wind erosion resistance of the topsoil.The optimal cementation solution(urea-CaCl2)concentration and spraying volume,according to experiments conducted on sandy land,were 0.2 mol/L and 4 L/m^2,respectively.Under this condition,the CaCO3 content was approximately 0.45%,the surface strength of sandy soil could reach 306.2 kPa,and the depth of wind erosion was approximately zero,after 30 d completion of SICP treatment.Soil surface strength declined with the increase of time,and long-term sand fixation effects of SICP treatment varied depending on topography.Whereas wind erosion in the top area of the windward slope was remarkable,sandy soils on the bottom area of the windward slope still maintained a relatively high level of surface strength and a low degree of wind erosion 12 month after SICP treatment.Scanning electron microscopy(SEM)tests with energy dispersive X-ray(EDX)confirmed the precipitation of CaCO3 and its bridge effect.These findings suggested that the SICP method is a promising candidate to protect sandy soil from wind erosion in desert areas.
基金supported by the Natural Science Foundation of Qinghai Province(Grant No.2024-ZJ-987).
文摘The China Loess Plateau is subjected to severe soil erosion triggered by intense rainfall,resulting in significant harm and losses to both human society and the natural surroundings.In this study,a novel technique for managing loess erosion is introduced,which involves the utilization of a combined polymer SH and ryegrass.A comprehensive series of tests were undertaken,including rainfall erosion tests,disintegration experiments,and scanning electron microscopy examinations,to assess the accumulative sediment yield(ASY),disintegration ratio,and microstructural features of both untreated and treated loess samples.The results showed a significant reduction in ASY with increased dry density of untreated loess.Furthermore,the combined technique effectively controlled erosion,limiting ASY to 266.2 g/cm^(2)in 60 minutes.This was approximately one-sixth,one-ninth,and one-fifteenth of the ASY in SH-treated loess(L-SH),ryegrass-treated loess(L-R),and untreated loess,respectively.It resisted disintegration better than ryegrass alone but slightly less than SH.This improvement was due to the combined effect of SH and ryegrass,which reduced raindrop impact,improved loess microstructure,and boosted ryegrass growth.The innovative technique holds the potential to be applied as a field-scale technique in the Loess Plateau region of China.
文摘To investigate the effects of various erosion control measures on mountain floods, a case study was conducted in Censhui River South Branch Watershed using scenario analysis and soil conservation service （SCS） methods. A distributed hydrological model was developed, and watershed parameters were determined based on satellite imagery, digital terrain models, digital maps and field investigations. Two types of erosion control measures were investigated： the variation of vegetation covers and the change of cultivation techniques. Seven scenarios were considered for the test watershed. The results show： （1） while the de-vegetation results in the increase of peak discharge, the improve of vegetation covers decreases peak discharge at watershed scale; （2） by both improving vegetation cover and enhancing terrace-cultivation technology, the peak discharge is reduced and the peak flow arrival time is delayed; （3） attention should be attached to both early warning system and measures changing the underlying surface and conveyance systems.
文摘The study investigated farmers＇ perception of soil erosion control measures and highlighted implications for sustainable development in agriculture and environment in southeast, Nigeria. Purposive, multistage and random sampling techniques were employed in selecting a sample size of two hundred and forty （240） respondents. Structured interview schedule was used for data collection, while percentages, mean ratings and factor analysis techniques were employed for analysis. The findings show that majority （64.6%） of farmers were within the ages of 40-59, while majority （67.9%） had either FSLC or WASCE/SSCE/GCE/OL qualifications. The farmers reported that the major soil erosion control measures used were strip cropping （M = 4.8） and making of ridges against slopes （M = 4.7）. The study reported that poor group affinity, inadequate institutional support and inadequate technical knowhow were constraints to soil erosion control in southeast, Nigeria. The study highlighted implications for sustainable development in agriculture and environment on organizational overhaul in extension, participatory extension policy on farmers groups and institutional re-orientation and synergy between Universities, Agricultural Development Programme （ADP）, Ministry of Agriculture （MOA） and Local Government Councils. In conclusion, success in soil erosion control and sustainable development in agriculture and environment in southeast, Nigeria depends on the extent issues raised and implications highlighted can be addressed. The study recommends improved funding support to extension, participatory extension training and contacts with farmers＇ groups and groups＇ resources management.
文摘While soils are as essential to human society as air and water,soil degradation has not received nearly as much attention as the threats to these other elements.On the map of water erosion of Europe,Southern Europe is red"colored".Erosion in the Balkan countries,through both on and offsite effects is a major cause of soil and water degradation.This paper compares erosion control works in several countries from the Balkan region(Macedonia,Serbia,and Bulgaria).The basis for comparative analyses was various country reports as well as available published papers.Quantitative method-text analyze method was used for these study.Natural conditions in the Balkan countries contribute to the appearance of various erosion forms and the intensity of the erosion processes.Over the history of these countries,people who settled this region used the available natural resources to fill their needs(tree cutting,incorrect plugging,overgrazing),which contributed to soil erosion.Organized erosion control works in the Balkans started in the beginning of the 20th century(1905 in Bulgaria).The highest intensity of erosion control works were carried out during the period 1945-1990.Various erosion control works were launched.Bulgaria had a large anti-erosion afforestation,almost 1 million ha.Bulgaria's ecological river restoration approach has been in use for almost 50 years.Serbia contributed significant erosion and torrent control works on hilly agricultural areas.Specific screen barrages and afforestation on extremely dry areas are characteristic in Macedonia.A common characteristic for all countries is a high decrease in erosion control works in the last 20 years.
基金the National Council for Scientific and Technological Development (CNPq) for funding the field studies and for the research productivity fellowship (CNPq/PQ) awarded to Pedro Henrique Augusto MEDEIROS and José Carlos de ARAúJOthe Coordination for the Improvement of Higher Education Personnel (CAPES) for the doctoral scholarship awarded to Teresa Raquel Lima FARIAS (2117/13-4)the Foundation for the Support of Scientific and Technological Development in the State of Ceará (FUNCAP) for the master scholarship awarded to Maria Thereza Rocha CHAVES。
文摘Vegetation plays a major role in soil protection against erosion effects,and studies have also highlighted its importance in retaining sediments from roadside slopes.Yet,hydro-sedimentological studies under natural precipitation conditions are still scarce in semi-arid areas due to difficulties in monitoring the few and very concentrated precipitation events.Quantifying sediment connectivity and yield at watershed scale,often highly impacted by the erosion of unpaved roads,is necessary for management plans.This study aims to evaluate the efficiency of native vegetation on roadside slope segments in Caatinga biome in retaining sediments and conserving the soil in a semi-arid area of Brazil.Surface runoff,sediment concentration,and yield measurements were measured from 34 natural precipitation events in four years on two slopes with and without vegetation.The runoff coefficients of the plot with no vegetation varied from 3.0%to 58.0%,while in the vegetated plot,they showed variation from 1.0%to 21.0%.The annual specific sediment yield ranged from 4.6 to 138.7 kg/(hm^(2)•a)for the vegetated plot and from 34.9 to 608.5 kg/(hm^(2)•a)for the unvegetated one.These results indicate a 4 to 12 times higher soil loss on the unvegetated slope in relation to the vegetated one and demonstrate that natural Caatinga vegetation acts as an effective barrier against surface-transported sediments.Moreover,natural Caatinga vegetation present on the slope plays an important role in breaking connectivity between sediment flows from unpaved roads and the watershed drainage system.These findings indicate that investments in unpaved road and roadside slope restoration,not only enhance road infrastructure but also promote environmental gains by reducing the impact of erosion.
基金the result of project(No.40061006)funded by the National Natural Sciences Foundation of China
文摘Severe soil erosion in the middle and upper reaches of Yangtze River has been regarded as a major environmental problem. The on-site impact of soil erosion on agricultural production and the off-site impact on floods and sedimentation in Yangtze Rive are well known. A quantitative assessment of soil erosion intensity is still scanty for developing appropriate soil erosion control measures for different land use types and zones in this region. This article constructs a localized USLE and estimates the average soil loss in the Jinsha River Region in Yunnan Province, one of the priority areas for soil erosion control in the middle and upper reaches of Yangtze River. The estimation is done under different land uses and zones in this basin. The estimation shows that while soil erosion in the cultivated land is the most severe, 36～40% of the garden and forest land suffers from soil erosion of various degrees due to lack of ground cover and other factors. Soil erosion in the pasture is modest when the ground cover is well maintained. It also confirmed that terracing can reduce soil erosion intensity significantly on the cultivated land. Research findings suggest that sufficient attention must be paid to regeneration of the ground cover in reforestation programs. In addition to mass reforestation efforts, restoration of grassland and terracing of the cultivated land should also play an important role in erosion control.
基金supported by the National Natural Science Foundation of China(41907047)the China Scholarship Council(202106515016)the Strategic International Collaboration of Scientific and Technological Innovation for the National Key Research and Development Plan(2016YFE0202900).
文摘The unique geomorphological features and farming methods in the Mollisol region of Northeast China increase water catchment flow and aggravate the erosion of ephemeral gully(EG).Vegetation suffers from rain erosion and damage during the growth stage,which brings serious problems to the restoration of grass in the early stage.Therefore,effects of coir geotextile and geocell on EG erosion under four confluence intensities were researched in this study.Results of the simulated water discharge erosion test showed that when the confluence strength was less than 30 L/min,geocell and coir geotextile had a good effect on controlling EG erosion,and sediment yield of geocell and coir geotextile was reduced by 25.95%–37.82%and 73.73%–88.96%,respectively.However,when confluence intensity increased to 40 L/min,protective effect of coir geotextile decreased,and sediment yield rate increased sharply by 189.03%.When confluence intensity increased to 50 L/min,the protective effect of coir geotextile was lost.On the other hand,geocell showed that the greater the flow rate,the better the protective effect.In addition,with the increase in confluence intensity,erosion pattern of coir geotextile developed from sheet erosion to intermittent fall and then to completion of main rill,and the protective effect was gradually weakened.In contrast,the protective effect of EG under geocell was gradually enhanced from the continuous rill to the intermittent rill and finally to the intermittent fall.This study shows that coir geotextile and geocell can prevent EG erosion,and the effect of geocell is better than that of coir geotextile on the surface of EG.
基金supported by the National Key Research and Development Plan(Grant Nos.2016YFC0503704,2016YFC0501602,2016YFC0501705)
文摘Soil erosion from chestnut forests has many types and intensities. However, less attention has been paid to the increasing soil erosion in the chestnut forests of Yanshan Mountains region, North China. The objective of this study was to discuss forest ages(<5, 5~<10, 10~<20, and 20~ yr), slopes(5°~<15°, 15°~<25°, 25°~<35°, and 35°~), slope positions(upslope, midslope, downslope, and whole slope), and slope aspects(sunny, half-sunny, shade, and half-shade) effects on soil erosion types and intensities in chestnut forests. A field survey was applied to investigate in detail the contiguous chestnut forests near Changfu village of Hebei Province, China on October 9-30, 2016. Results showed that chestnut forests are dominated by moderate erosion in this region, and the soil erosionfrom chestnut forests tended to deteriorate gradually. The average land degradation index was 0.31. The erosion intensity from chestnut forests will gradually increase with the year of planting. Most of the slopes are greater than 15°, accounting for 86.7% of the total chestnut forests. Most of the chestnut forests occupy the whole slope, accounting for 47.5% of the total area. Moderate erosion occurs most commonly for different slope aspects. In conclusion, improving the preparation efficiency of chestnut forests and enhancing the construction standards of soil and water conservation measures would be useful measures to avoid soil erosion from chestnut forests reaching a more severe level.
基金Prestige Institute of Engineering, Management, and Research, Indore, India for their supportGuangdong Department of Science and Technology,China for"Overseas Famous Teacher Project"(Grant No.2020A1414010268)。
文摘Wind erosion is one of the significant natural calamities worldwide, which degrades around one-third of global land. The eroded and suspended soil particles in the environment may cause health hazards, i.e.allergies and respiratory diseases, due to the presence of harmful contaminants, bacteria, and pollens.The present study evaluates the feasibility of microbially induced calcium carbonate precipitation(MICP)technique to mitigate wind-induced erosion of calcareous desert sand(Thar desert of Rajasthan province in India). The temperature during biotreatment was kept at 36℃ to stimulate the average temperature of the Thar desert. The spray method was used for bioaugmentation of Sporosarcina(S.) pasteurii and further treatment using chemical solutions. The chemical solution of 0.25 pore volume was sprayed continuously up to 5 d, 10 d, 15 d, and 20 d, using two different concentration ratios of urea and calcium chloride dihydrate viz 2:1 and 1:1. The biotreated samples were subjected to erosion testing(in the wind tunnel) at different wind speeds of 10 m/s, 20 m/s, and 30 m/s. The unconfined compressive strength of the biocemented crust was measured using a pocket penetrometer. The variation in calcite precipitation and microstructure(including the presence of crystalline minerals) of untreated as well as biotreated sand samples were determined through calcimeter, scanning electron microscope(SEM), and energydispersive X-ray spectroscope(EDX). The results demonstrated that the erosion of untreated sand increases with an increase in wind speeds. When compared to untreated sand, a lower erosion was observed in all biocemented sand samples, irrespective of treatment condition and wind speed. It was observed that the sample treated with 1:1 cementation solution for up to 5 d, was found to effectively resist erosion at a wind speed of 10 m/s. Moreover, a significant erosion resistance was ascertained in15 d and 20 d treated samples at higher wind speeds. The calcite content percentage, thickness of crust,bulk density, and surface strength of biocemented sand were enhanced with the increase in treatment duration. The 1:1 concentration ratio of cementation solution was found effective in improving crust thickness and surface strength as compared to 2:1 concentration ratio of cementation solution. The calcite crystals formation was observed in SEM analysis and calcium peaks were observed in EDX analysis for biotreated sand.
基金National Natural Science Foundation of China,No.42277329,No.41807065,No.42077067China Postdoctoral Science Foundation,No.2018M640714Fundamental Research Funds for the Central Universities,No.2662021ZHQD003。
文摘Gully erosion,an integrated result of various social and environmental factors,is a severe problem for sustainable development and ecology security in southern China.Cur-rently,the dominant driving forces on gully distribution are shown to vary at different spatial scales.However,few systematic studies have been performed on spatial scaling effects in identifying driving forces for gully erosion.In this study,we quantitatively identified the de-terminants of gully distribution and their relative importance at four different spatial scales(southern China,Jiangxi province,Ganxian county,and Tiancun township,respectively)based on the Boruta algorithm.The optimal performance of gully susceptibility mapping was investigated by comparing the performance of the multinomial logistic regression(MLR),lo-gistic model tree(LMT),and random forest(RF).Across the four spatial scales,the total contributions of gully determinants were classified as lithology and soil(32.65%)≥topogra-phy(22.40%)>human activities(22.31%)>climate(11.32%)>vegetation(11.31%).Among these factors,precipitation(7.82%),land use and land cover(6.16%),rainfall erosivity(10.15%),and elevation(11.59%)were shown to be the predominant factors for gully erosion at the individual scale of southern China,province,county,and township,respectively.In addition,contrary to climatic factors,the relative importance of soil properties and vegetation increased with the decrease of spatial scale.Moreover,the RF model outperformed MLR and LMT at all the investigated spatial scales.This study provided a reference for factor selection in gully susceptibility modeling and facilitated the development of gully erosion management strategies suitable for different spatial scales.
基金Common Fund for Commodities and the OPEC Fund for International Development for funding to carry out this study in collaboration with National Jute Board,Kolkata,India and Jute Diversification Promotion Centre,Bangladesh
文摘Mountainous regions of the globe experience landslides due to heavy rainfall and unplanned construction on slopes.Geojute is adopted globally as a landslide rehabilitation measure,but its impact on natural vegetation development is poorly understood.The present study was conducted to examine the impact of geojute application on vegetation restoration,ecology and carbon stock in a recently occurred landslide,during 2012.The results revealed that the geojute application improved the richness,diversity,density and basal area of plant species at the landslide site.Likewise,biomass production,carbon stock and carbon sequestration of plant species was observed significantly higher in geojute treatments compared to control(without geojute treatment).Moreover,significant improvement in soil moisture was recorded beneath the geojute treatments.Further,results showed that the geojute is highly effective in controlling soil erosion at the landslide site.The findings of this study revealed ecological and environmental benefits of geojute application in term of improvement in vegetation recovery processes,species diversity and carbon sequestration at the landslide site.The scientific outcome of this study can be helpful for planning the rehabilitation measures in landslide affected regions of the globe.
文摘Recent studies show an increase in the population of beavers, nutria and other rodents in vast regions of central Europe over the last 15 years. Unfortunately, this caused in many instances considerable damage on large rivers along dykes and earthworks in the floodplain areas, leading to an increased risk of bank failures. However, most of these mammals belong to protected species. This work is aimed at showing positive experience in cooperation with universities, research institutes and environmental agencies regarding measures to permanently safeguard the banks using composite erosion control systems with polymer coated steel wire net （as flexible reinforcement component） and a geosynthetic （to promote vegetation growth）. The steel mesh component works as an effective long-term barrier against the intrusion of mammals, discouraging them from digging inside the core of the dyke. An analysis of the sensitive areas to be protected led also to definition of the characteristics of these interventions （length, shape, escape ways, population areas, etc.）. The study will present several additional benefits when using polymer steel nets along dykes, such as： high and durable erosion protection in overflow areas, promotion of fast and effective vegetation growth （increasing stability）, surface protection against ice impacts （in northern regions）, ease of installation, maintenance, ability to conform to irregular shapes of the slope. This work will also present the positive outcome of research studies along dykes in Germany, Austria and in Italy.
基金supported by the Ministy of Sci ence and Technology(Grant No 2003CB415206)the National Natural Science F oundation of China(Grant No.40371010)
文摘Vegetation-erosion dynamics is a new interdisciplinary science,studying the laws of evolution of watershed vegetation under the action of various ecological stresses.Introducing a qualitative expression of ecological stresses in this paper,the present authors establish the cou-pled differential equations for the vegetation-erosion process and derive a theoretical solution.The model is applied to the Anjiagou watershed on the Loess Pateau and the Xiaojiang water-shed and its sub-watersheds on the Yunnan Plateau.The calculated results agree well with the vegetation development processes.Abstracted from the differential equations the so-called vegetation-erosion chart is worked out,with which we can predict the development trend of vegetation under no human stresses.It is demonstrated that the erosion control is important for vegetation development and reforestation must be a long-term strategy.On the Yunnan Plateau with relatively high precipitation and temperature,vegetation can be greatly improved if erosion is controlled.On the dry and cold Loess Pateau suffering from high rate of soil erosion,however,vegetation can effectively control erosion but erosion reduction exhibits low effectiveness on vegetation development.Vegetation in the area is not stable and management is always needed to maintain the vegetation.
基金the Natural Sciences and Engineering Research Council of Canada(NSERC)to Sean C.Thomas.
文摘Green roofs are exposed to high winds and harsh environmental conditions that can degrade vegetation and erode substrate material,with negative consequences to ecosystem services.Biochar has been promoted as an effective substrate additive to enhance plant performance,but unprocessed biochars are susceptible to wind and water erosion.Applications of granulated biochars or chemical dust suppressants are suggested as a means to mitigate biochar and substrate erosion;however,research on biochar type and chemical dust suppressant use on biochar and substrate erosion is lacking.Vegetation is a crucial factor that influences substrate erosion,yet plant responses may vary with biochar type and chemical dust suppressant;thus,the effects of possible mitigation measures on biochar and substrate erosion are unclear.We investigated the effects of surface-applied granulated and unprocessed biochars and an organic dust suppressant(Entac™)on biochar and substrate erosion on green roofs with Sedum album L.and a native plant mix.Our results show that 94%of unprocessed biochars were lost from green roofs after 2 years regardless of the Entac™amendment,likely due to the lightweight nature and fragmentation of biochar particles.In contrast,granulation of biochars reduced the biochar erosion and total substrate erosion by 74%and 39%,respec-tively,possibly due to enhanced biochar bulk density and particle size and improved moisture retention of biochar-amended substrates.Additionally,Sedum album better reduced biochar and substrate erosion than the native plant mix,likely due to rapid development of high vegetation cover that reduced wind exposure and enhanced substrate moisture retention.We conclude that applications of granulated biochars can substantially reduce biochar and sub-strate erosion on green roofs,improving green roof sustainability.
基金supported by the Zhejiang Provincial Natural Science Foundation of China under grant no.LR24C130001the Department of Science and Technology of Zhejiang Province(2022C02032).
文摘Dear Editor,American sloughgrass(Beckmannia syzigachne[Steud.]Fernald)(2n=14)(Amosova et al.,2019),a diploid species within the Poaceae family,exhibits both annual and perennial life cycles and is self-pollinating.It is widely distributed throughout Eastern Asia,Western Europe,and North America(https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:30332-2),playing a crucial role in both natural ecosystems and agricultural settings.B.syzigachne is important for wetland restoration and erosion control but also poses significant challenges as a weed in agricultural systems,particularly in rice–wheat and rice–rapeseed double-cropping systems(Qu et al.,2021).Understanding the genetic elements underpinning B.syzigachne’s adaptation to diverse environments is crucial for studying traits like herbicide resistance and stress tolerance,which are key to enhancing agricultural efficiency and promoting sustainable cropping practices.However,the lack of a reference genome has impeded progress in this area.More broadly,the International Weed Genomics Consortium is advancing genomic tools to advance sustainable weed control and provide insights into stress tolerance,potentially benefiting crop breeding(Montgomery et al.,2024).
文摘Nearly forty years after the Clean Water Act(CWA)was passed,we’ve come a long way in our understanding of the strength and fragility of our water resources and the impact that our actions or inactions can have on them.Though regulatory systems are in place and best management practices(BMPs)are plentiful,successfully managing risk in environmental compliance remains a constant concern.Fortunately,the rules to environmental compliance are simple:half of it is paperwork and the other half is maintenance.If you take an organized and balanced approach to compliance,you should be able to keep risk at bay and avoid enforcement action.However,remember that no matter how thoroughly you prepare for a construction project,you may still encounter unexpected situations requiring environmental knowledge and understanding.As you start to plan your operation,you should take the time to stop and consider the risk associated with your project.The Environmental Protection Agency(EPA)considers risk to be“the chance of harmful effects to human health or to ecological systems resulting from exposure to the environmental stressor.”The“stressors”are a variety of physical,chemical,or biological activities that can cause negative reactions to ecosystems and the environment.1 In order to limit,and hopefully prevent,risky situations,the key is to assess and target the problems that could arise and then implement a system of metrics that help with prevention.
