Emerging tick-borne viruses are posing an increasing health concern.However,there is limited knowledge about the distribution characteristics of tick virome in Yunnan Province,southwestern China,where it is distinguis...Emerging tick-borne viruses are posing an increasing health concern.However,there is limited knowledge about the distribution characteristics of tick virome in Yunnan Province,southwestern China,where it is distinguished by its diverse eco-climatic zones and rich biodiversity,making it a hotspot for studying tick-borne pathogens.The present study aimed to explore the diversity and ecological characteristics of tick virome in Yunnan Province,especially to identify novel potentially pathogenic viruses threatening human and vertebrate animals,and to investigate host-specific viral tropisms and their transmission characteristics.Using a meta-transcriptomic approach,the study analyzed the viromes of 448 individual ticks and approximately 10,000 eggs collected from nine counties with different hosts,altitudes and landscapes.The ticks encompassed eight species across four genera.The study focused on delineating virome diversity profiles,evaluating host-specific viral tropisms,and investigating potential transovarial transmission through viral contigs identification and Sanger sequencing.The study identified 53 viral families,revealing significant virome diversity and geographic and environmental specificity.Haemaphysalis and Ixodes ticks exhibited greater viral richness and abundance,with host taxonomy being a primary influencing factor.We determined 102 viral genomes encompassing 35 species,comprising 15 novel viruses identified when their RNAdependent RNA polymerase/DNA polymerase sequences exhibited<90% amino acid identity to known viruses.The novel vectors for vertebrate-related or potentially pathogenic viruses were also detected,thus providing new insights into transmission cycles.The evidence for transovarial transmission was reinforced by the absence of significant differences in Chuviridae and Nairoviridae families between female ticks and their eggs.These findings underscore the necessity of continuous surveillance to avert the spillover of emerging pathogens.展开更多
According to the investigation of sampling area of 6800 m2 on the south slope of Shennongjia Mountain, there were 126 vascular plant species, belonging to 108 genera and 64 families, in the investigated rare plant com...According to the investigation of sampling area of 6800 m2 on the south slope of Shennongjia Mountain, there were 126 vascular plant species, belonging to 108 genera and 64 families, in the investigated rare plant communities, of which 9 rare plant species were recorded, accounting for 27.3% of the total rare plants. The communities were about 30 m in height and were divided into three layers as tree layer, shrub layer, and herb layer. The flora of the communities had obvious temperate character. Phanerophytes (accounted for 65.9%), Mesophyllous (62.7%), Papyraceous (84.1%), simple leaf (83.3%), un-entire leaf (69.8%) were dominant in life form, leaf size class, leaf texture, leaf form, and leaf margin respectively. According to important value of species, the communities were divided into three types as Davidia involucrata + Litsea pungens community, Cercidiphyllum japanicum + Padus wilsonii community, and Padus wilsonii + Acer mono community. The indexes of species diversity of tree layer had little difference among communities and evenness was high. The results indicated that the communities had complex structure and relative stability.展开更多
This paper reports the investigation of artificial vegetation communities on excavated slopes in a construction perturbed area of the Xiangjiaba hydroelectric power station in the Jinsha River Basin, P. R. China. Belt...This paper reports the investigation of artificial vegetation communities on excavated slopes in a construction perturbed area of the Xiangjiaba hydroelectric power station in the Jinsha River Basin, P. R. China. Belt transect and random quadrats were used in sampling and recording the vegetation of the four selected plots on the slopes. The community of each plot was characterized based on the coverage, relative importance value, richness, diversity, evenness of species derived from the survey data. Problems of these communities were identified and corresponding regulation measures were proposed to accelerate the positive succession process of the ecosystem. It is demonstrated that the artificial vegetation restoration on the excavated slope has improved the ecological environment.展开更多
In order to investigate the change of ecological characteristics due to the decrease of COD/SO_4^(2-) ratio during sulfate reduction, continuous-flew tests were conducted in an acidogenic sulfate-reducing reactor with...In order to investigate the change of ecological characteristics due to the decrease of COD/SO_4^(2-) ratio during sulfate reduction, continuous-flew tests were conducted in an acidogenic sulfate-reducing reactor with molasses wastewater as sole organic carbon source and sodium snlfate as electron acceptor, and the change of pH value, oxidation reduction potential (ORP), volatile fat acids (VFAs), alkalinity (ALK) and the predominant populations with COD/SO_4^(2-) ratio decreasing from 4.2 to 2.0 were investigated. The experimental results demonstrated that, with decreasing COD/SO_4^(2-) ratio, ORP and ALK increased, pH value decreased, and the proportion of acetic acid in terminal products decreased significantly, and a stable -type microbial community with high COD/SO_4^(2-) ratio was converted into a sub -stable -type one with low COD/SO_4^(2-) ratio.展开更多
A 5-year study on the soil ecological environment of matsutake (Trihcholoma Matsutake) growing areas near Changbai Mountains showed that several factors, such as climate, parent material, organism and landform, which ...A 5-year study on the soil ecological environment of matsutake (Trihcholoma Matsutake) growing areas near Changbai Mountains showed that several factors, such as climate, parent material, organism and landform, which form the soil ecosystem provided suitable ecological environment for the formation and growth of matsutake. How to improve the construction and function of the soil ecosystem in order to utilize the natural resource continuously was also studied.展开更多
Ips subelongatus Motschulsky were raised indoors and in the field using fresh baits for Study of biological and ecological characteristics during 1992-1994. The life cycle of the pest in Lishu County Jilin Province wa...Ips subelongatus Motschulsky were raised indoors and in the field using fresh baits for Study of biological and ecological characteristics during 1992-1994. The life cycle of the pest in Lishu County Jilin Province was described. The study results indicated that temperature was a main factor affecting the development of 1ps Subelongatus, The initial temperature for development of egg, larva, pupa and adult was 6.1, 8.0, 10.3 and 9.8℃,respectively. To complete one-generation needs, respectively, 48 d at temperature of 18 ℃, 39 d at 20℃ and 33d at 22℃. The pest has different number of generations in different area as a result of temperature change. In Jilin Province, it generally has three generations, except that some individuals have 2 generations. The nature enemies for this pest are Thanasinus substriatus, Tomhoicobia seitneri Ruschk, Coeliodes sp. etc.展开更多
In the sea area west of the middle line of Taiwan Straits, 116°40′～120°30′E, 22°22.9′～25°43′N, four cruises of comprehensive survey were conducted by the Third Institute of Oceanography, Stat...In the sea area west of the middle line of Taiwan Straits, 116°40′～120°30′E, 22°22.9′～25°43′N, four cruises of comprehensive survey were conducted by the Third Institute of Oceanography, State Oceanic Administration, from May, 1984 to February, 1985. The data concerned were taken from the quantitative samples obtained by using large-sized standard zooplankton nets, while the values adopted such as hydrological and chemical data of the various stations were from the average values of the field data of each one-meter layer.展开更多
Abundance of total bacteria, heterotrophic bacteria, coliform and oil degradable bacteria and their relations with salinity and suspended matter in the frontal waters in the Hangzhou Bay are described. The results obt...Abundance of total bacteria, heterotrophic bacteria, coliform and oil degradable bacteria and their relations with salinity and suspended matter in the frontal waters in the Hangzhou Bay are described. The results obtained show that the highest abundances of total bacteria , heterotrophic bacteria are encountered around the front and near the northern shore of the Hangzhou Bay, where a positive correlation ( r =0. 70) between the total bacteria abundance and the total suspended matter (TSM) is persent. Moreover,the abundance of oil degradable bacteria being an indicator of oil pollution, is also high in that region.展开更多
Objective To explore the biological basis of the damp-heat stasis-toxin syndrome in colorectal cancer(CRC)patients.Methods Totally 100 patients with CRC and 50 healthy individuals were screened.A total of 41 patients ...Objective To explore the biological basis of the damp-heat stasis-toxin syndrome in colorectal cancer(CRC)patients.Methods Totally 100 patients with CRC and 50 healthy individuals were screened.A total of 41 patients with CRC with damp heat stasis syndrome(SRYD),41 patients with CRC without damp heat stasis syndrome(FSRYD)and 40 healthy individuals(Normal)were enrolled.16S rRNA sequencing technology was used to analyze the differences in the composition and diversity of microbial groups.Results There was no significant difference in richness and diversity among SRYD,FSRYD and Normal groups.Compared with other groups,different expressions ofFirmicutes,Actinobacteriota,Elusimicrobiota,RCP2-54 at phylum level,Ralstonia,Sphingomonas,Dialister,Corynebacterium,Rothia,Odoribacter,Streptococcus and so on at genus level were detected in SRYDD groups.A possible noninvasive biomarker of damp-heat stasis andtoxin syndrome in colorectal cancer may be Streptococcus.LEfSe analysis indicated a ggreaterabundanceof Firmicutes,Actinobacteriota,Streptococcaceae,Streptococcus,Actinobacteria,Granulicatella,Rothia,Corynebacteriales,Corynebacteriaceae,Corynebacterium in SRYD groups.PICRUSt functional predictive analysis indicated the primary enrichment pathway of the SRYD group's differential expression are phosphotransferase system,valine,leucine and isoleucine degradation,central carbon metabolism in cancer,carbohydrate transport and metabolism.Conclusion It is reasonable to analyze CRC Chinese medicine syndrome differentiation from the perspective of tongue coating flora.Tongue coating flora can be used to diagnose damp-heat stasis-toxin syndrome in CRC patients.Streptococcus could be a noninvasive biomarker for damp-heat stasis-toxin syndrome in CRC.展开更多
This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Ac...This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Acanthus ebracteatus.It further delves into the factors leading to its endangered status and proposes corresponding protection strategies.The mian reasons for the endangered of A.ebracteatus are as follows:illegal harvesting of whole plants,habitat destruction,reproductive obstacles,and competition or interference from invasive or noxious plant species.To address these threats,a series of conservation strategies are proposed.Firstly,in-depth research on the artificial propagation techniques of A.ebracteatus should be conducted to surmount reproductive barriers.Secondly,habitat restoration initiatives need to be carried out to create a suitable ecological setting.Thirdly,in-situ protections should be enhanced while the implementing ex-situ conservation measures.Meanwhile,continuous monitoring of A.ebracteatus seedlings should be conducted to strengthen subsequent management and conservation efforts.Finally,it is recommended to rationally explore and utilize the medicinal properties of A.ebracteatus.展开更多
Based on extensive literature search,the composition,pharmacology,clini cal applications of Passiflora foetida L,ecological characteristics were summarized with the aim to provide scientific data for further research ...Based on extensive literature search,the composition,pharmacology,clini cal applications of Passiflora foetida L,ecological characteristics were summarized with the aim to provide scientific data for further research and exploitation.展开更多
This study attempted to determine the characteristics of the communities, the ecological factors, and the denitrifying enzyme activity for denitrifying bacteria found in the paddy soils of the Taihu Lake Basin, China....This study attempted to determine the characteristics of the communities, the ecological factors, and the denitrifying enzyme activity for denitrifying bacteria found in the paddy soils of the Taihu Lake Basin, China. Samples of the six main soil types of the basin were taken from paddy fields with different fertilities. The total numbers of bacteria and denitrifying bacteria in the high fertility soils were much more than those in low fertility soils, and the number of denitrifying bacteria accounted for 49% to 80% of the total number of bacteria. The O2 content was an important ecological factor that affected denitrification. Of test the strains isolated from the paddy soils in the Taihu Lake Basin, some (e.g., Pseudomonas spp.) grew well under low oxygen partial pressure, while others (e.g., Bacillus spp.) had no strict predilection with O2 content. Another critical ecological factor was the nitrogen concentration. Three selected denitrifying bacteria grew better in aculture medium with 135 instead of 276mg L^-1 nitrogen. At the same time 67% of the test strains were able to reduce NO3^- to NO2^- and 56% had N2O reductase.展开更多
This paper focuses on the growth response of Caragana microphylla seedlings to changes of artificially controlled water table in Horqin Sandy Land, China. Monitoring results of soil water content shows that soil moist...This paper focuses on the growth response of Caragana microphylla seedlings to changes of artificially controlled water table in Horqin Sandy Land, China. Monitoring results of soil water content shows that soil moisture is closely correlated to groundwater depths. Soil volumetric water increased rapidly when close to water sources and finally stabilized in a saturated state. The soil moisture trend of CK （control） increased gradually at 0-50 cm of soil depth then decreased to 4% below 50 cm soil depth. C. microphylla can adapt to different soil environments by changes in ecological and physiological characteristics. By comparing the ecological characteristics of C. microphylla seedlings at various water tables, we found that a shallow water table of 40 cm depth inhibited seedling groundwater depth of 120 em was more advantageous for plant growth because of weak ecological characteristics. A height and canopy growth of C. microphylla seedlings. During the first two years, the most suitable water depth for root biomass was 120 cm, and 180 cm for root length. The growth of vertical roots is positively correlated with groundwater depth, and root thickness is the determinate factor for root biomass while the fine root is the determinate factor for root length. A thick root would grow much more in a natural drought environment while access to ground water promotes the growth of fine roots.展开更多
The vegetation has been poisoned by gold in the western Guangdong-Hainan region. The gold content ofthe leaves there is as high as 10-1961 times the abundance, the chlorophyll content is 10%-30% lower thanthat of the ...The vegetation has been poisoned by gold in the western Guangdong-Hainan region. The gold content ofthe leaves there is as high as 10-1961 times the abundance, the chlorophyll content is 10%-30% lower thanthat of the vegetation in metamorphic terrains and 10%-20% higher than that in granite terrains, and thecarotenoid content is 10%-44% lower than the background value. The water content of leaves is 10% to 20%lower than the background value. The cells of leaves are deformed and broken. The leaf surface shows colourspots and becomes yellow or dark green. The spectral reflectance of the leaf surface is 5%-30% higher than thebackground value: the spectral shape has shifted 5-15 nm to the short wavelength. The gray scales of eanopyon images of Landsat TM and airborne imaging scanner (AIS) are 10%-100% higher than the backgroundvalues. On Landsat TM and AIS false colour images, plants poisoned by gold display a yellow color, whichdisinguishes them from background plants. According to the spectral and image features of goldbiogeochemical effects, the author has constructed a gold information system and expert prediction system,and thus two gold target areas and two gold prospect areas have been identified rapidly, economically andaccurately in the western Guangdong-Hainan region which is extensively covered by vegetation.展开更多
The construction of an ecological security pattern(ESP)is an effective approach to addressing ecological concerns in urban agglomerations.However,previous research has often overlooked the ecological characteristics a...The construction of an ecological security pattern(ESP)is an effective approach to addressing ecological concerns in urban agglomerations.However,previous research has often overlooked the ecological characteristics at different spatial scales,making it difficult to effectively tackle environmental issues.This study focuses on the Changsha–Zhuzhou–Xiangtan urban agglomeration(CZXUA)to construct an ESP from 2 scales:the urban agglomeration and the metropolitan area.First,ecological sources at different scales were identified and optimized using morphological spatial pattern analysis,ecosystem service supply assessment,landscape connectivity evaluation,and ecological demand intensity analysis.Next,spatial principal component analysis was employed to analyze resistance factors across different spatial scales,enabling the construction of a multi-scale landscape resistance surface.Finally,multi-scale ecological corridors were extracted using circuit theory,and the ecological corridors passing through the central urban area were optimized.As a result,176 ecological sources,337 ecological corridors,60 ecological pinch points,and 30 ecological barrier points were identified,forming the overall ESP for the CZXUA.Furthermore,an ecological protection and optimization pattern,described as“One River,Seven Waters,One Heart,and Eight Wedges”,was proposed based on the ESP.This pattern highlights pivotal areas for ecological protection and restoration within the national land space.This study provides a comprehensive example of constructing a multi-scale ecological corridor network and identifying critical areas for ecological protection and restoration.The findings can serve as a reference for special ecological protection planning in urban agglomerations.展开更多
基金supported by the National Key Research and Development Program of China(2024YFC2607504)National Natural Science Foundation of China(U2002219).
文摘Emerging tick-borne viruses are posing an increasing health concern.However,there is limited knowledge about the distribution characteristics of tick virome in Yunnan Province,southwestern China,where it is distinguished by its diverse eco-climatic zones and rich biodiversity,making it a hotspot for studying tick-borne pathogens.The present study aimed to explore the diversity and ecological characteristics of tick virome in Yunnan Province,especially to identify novel potentially pathogenic viruses threatening human and vertebrate animals,and to investigate host-specific viral tropisms and their transmission characteristics.Using a meta-transcriptomic approach,the study analyzed the viromes of 448 individual ticks and approximately 10,000 eggs collected from nine counties with different hosts,altitudes and landscapes.The ticks encompassed eight species across four genera.The study focused on delineating virome diversity profiles,evaluating host-specific viral tropisms,and investigating potential transovarial transmission through viral contigs identification and Sanger sequencing.The study identified 53 viral families,revealing significant virome diversity and geographic and environmental specificity.Haemaphysalis and Ixodes ticks exhibited greater viral richness and abundance,with host taxonomy being a primary influencing factor.We determined 102 viral genomes encompassing 35 species,comprising 15 novel viruses identified when their RNAdependent RNA polymerase/DNA polymerase sequences exhibited<90% amino acid identity to known viruses.The novel vectors for vertebrate-related or potentially pathogenic viruses were also detected,thus providing new insights into transmission cycles.The evidence for transovarial transmission was reinforced by the absence of significant differences in Chuviridae and Nairoviridae families between female ticks and their eggs.These findings underscore the necessity of continuous surveillance to avert the spillover of emerging pathogens.
基金This paper was supported by the Chinese Academy of Sciences (KZCX2-406) National Natural Science Foundation of China (NSFC39970123) Changbai Mountain Open Research Station.
文摘According to the investigation of sampling area of 6800 m2 on the south slope of Shennongjia Mountain, there were 126 vascular plant species, belonging to 108 genera and 64 families, in the investigated rare plant communities, of which 9 rare plant species were recorded, accounting for 27.3% of the total rare plants. The communities were about 30 m in height and were divided into three layers as tree layer, shrub layer, and herb layer. The flora of the communities had obvious temperate character. Phanerophytes (accounted for 65.9%), Mesophyllous (62.7%), Papyraceous (84.1%), simple leaf (83.3%), un-entire leaf (69.8%) were dominant in life form, leaf size class, leaf texture, leaf form, and leaf margin respectively. According to important value of species, the communities were divided into three types as Davidia involucrata + Litsea pungens community, Cercidiphyllum japanicum + Padus wilsonii community, and Padus wilsonii + Acer mono community. The indexes of species diversity of tree layer had little difference among communities and evenness was high. The results indicated that the communities had complex structure and relative stability.
基金Funded by the Natural Science Foundation of China (No. 50879043)the National S & T Support Program of China during the 11th Five-Year Plan Period (No. 2006BAC10B04)
文摘This paper reports the investigation of artificial vegetation communities on excavated slopes in a construction perturbed area of the Xiangjiaba hydroelectric power station in the Jinsha River Basin, P. R. China. Belt transect and random quadrats were used in sampling and recording the vegetation of the four selected plots on the slopes. The community of each plot was characterized based on the coverage, relative importance value, richness, diversity, evenness of species derived from the survey data. Problems of these communities were identified and corresponding regulation measures were proposed to accelerate the positive succession process of the ecosystem. It is demonstrated that the artificial vegetation restoration on the excavated slope has improved the ecological environment.
基金Sponsored by the National Natural Science Foundation of China(Grant No. 50208006)the Scientific Research Foundation of Harbin Institute of Technology(Grant No. HIT. 2001.51)
文摘In order to investigate the change of ecological characteristics due to the decrease of COD/SO_4^(2-) ratio during sulfate reduction, continuous-flew tests were conducted in an acidogenic sulfate-reducing reactor with molasses wastewater as sole organic carbon source and sodium snlfate as electron acceptor, and the change of pH value, oxidation reduction potential (ORP), volatile fat acids (VFAs), alkalinity (ALK) and the predominant populations with COD/SO_4^(2-) ratio decreasing from 4.2 to 2.0 were investigated. The experimental results demonstrated that, with decreasing COD/SO_4^(2-) ratio, ORP and ALK increased, pH value decreased, and the proportion of acetic acid in terminal products decreased significantly, and a stable -type microbial community with high COD/SO_4^(2-) ratio was converted into a sub -stable -type one with low COD/SO_4^(2-) ratio.
文摘A 5-year study on the soil ecological environment of matsutake (Trihcholoma Matsutake) growing areas near Changbai Mountains showed that several factors, such as climate, parent material, organism and landform, which form the soil ecosystem provided suitable ecological environment for the formation and growth of matsutake. How to improve the construction and function of the soil ecosystem in order to utilize the natural resource continuously was also studied.
文摘Ips subelongatus Motschulsky were raised indoors and in the field using fresh baits for Study of biological and ecological characteristics during 1992-1994. The life cycle of the pest in Lishu County Jilin Province was described. The study results indicated that temperature was a main factor affecting the development of 1ps Subelongatus, The initial temperature for development of egg, larva, pupa and adult was 6.1, 8.0, 10.3 and 9.8℃,respectively. To complete one-generation needs, respectively, 48 d at temperature of 18 ℃, 39 d at 20℃ and 33d at 22℃. The pest has different number of generations in different area as a result of temperature change. In Jilin Province, it generally has three generations, except that some individuals have 2 generations. The nature enemies for this pest are Thanasinus substriatus, Tomhoicobia seitneri Ruschk, Coeliodes sp. etc.
文摘In the sea area west of the middle line of Taiwan Straits, 116°40′～120°30′E, 22°22.9′～25°43′N, four cruises of comprehensive survey were conducted by the Third Institute of Oceanography, State Oceanic Administration, from May, 1984 to February, 1985. The data concerned were taken from the quantitative samples obtained by using large-sized standard zooplankton nets, while the values adopted such as hydrological and chemical data of the various stations were from the average values of the field data of each one-meter layer.
文摘Abundance of total bacteria, heterotrophic bacteria, coliform and oil degradable bacteria and their relations with salinity and suspended matter in the frontal waters in the Hangzhou Bay are described. The results obtained show that the highest abundances of total bacteria , heterotrophic bacteria are encountered around the front and near the northern shore of the Hangzhou Bay, where a positive correlation ( r =0. 70) between the total bacteria abundance and the total suspended matter (TSM) is persent. Moreover,the abundance of oil degradable bacteria being an indicator of oil pollution, is also high in that region.
文摘Objective To explore the biological basis of the damp-heat stasis-toxin syndrome in colorectal cancer(CRC)patients.Methods Totally 100 patients with CRC and 50 healthy individuals were screened.A total of 41 patients with CRC with damp heat stasis syndrome(SRYD),41 patients with CRC without damp heat stasis syndrome(FSRYD)and 40 healthy individuals(Normal)were enrolled.16S rRNA sequencing technology was used to analyze the differences in the composition and diversity of microbial groups.Results There was no significant difference in richness and diversity among SRYD,FSRYD and Normal groups.Compared with other groups,different expressions ofFirmicutes,Actinobacteriota,Elusimicrobiota,RCP2-54 at phylum level,Ralstonia,Sphingomonas,Dialister,Corynebacterium,Rothia,Odoribacter,Streptococcus and so on at genus level were detected in SRYDD groups.A possible noninvasive biomarker of damp-heat stasis andtoxin syndrome in colorectal cancer may be Streptococcus.LEfSe analysis indicated a ggreaterabundanceof Firmicutes,Actinobacteriota,Streptococcaceae,Streptococcus,Actinobacteria,Granulicatella,Rothia,Corynebacteriales,Corynebacteriaceae,Corynebacterium in SRYD groups.PICRUSt functional predictive analysis indicated the primary enrichment pathway of the SRYD group's differential expression are phosphotransferase system,valine,leucine and isoleucine degradation,central carbon metabolism in cancer,carbohydrate transport and metabolism.Conclusion It is reasonable to analyze CRC Chinese medicine syndrome differentiation from the perspective of tongue coating flora.Tongue coating flora can be used to diagnose damp-heat stasis-toxin syndrome in CRC patients.Streptococcus could be a noninvasive biomarker for damp-heat stasis-toxin syndrome in CRC.
基金Supported by Special Innovation Projects for Regular Institutions of Higher Education in Guangdong Province(2023KTSCX071)Zhanjiang Science and Technology Bureau Project(2023A01018)Colonel-level Project(LY2207).
文摘This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Acanthus ebracteatus.It further delves into the factors leading to its endangered status and proposes corresponding protection strategies.The mian reasons for the endangered of A.ebracteatus are as follows:illegal harvesting of whole plants,habitat destruction,reproductive obstacles,and competition or interference from invasive or noxious plant species.To address these threats,a series of conservation strategies are proposed.Firstly,in-depth research on the artificial propagation techniques of A.ebracteatus should be conducted to surmount reproductive barriers.Secondly,habitat restoration initiatives need to be carried out to create a suitable ecological setting.Thirdly,in-situ protections should be enhanced while the implementing ex-situ conservation measures.Meanwhile,continuous monitoring of A.ebracteatus seedlings should be conducted to strengthen subsequent management and conservation efforts.Finally,it is recommended to rationally explore and utilize the medicinal properties of A.ebracteatus.
基金Supported by the Key Laboratory of Resource Biology and Biotechnology in Western China of Ministry of Education (KH09030)the Special Fund for the Science and Technology of Science and Technology Department of Tibet Autonomous Region (20091012)the Scientific Research Program Funded by Shaanxi Provincial Education Department (2010JK862)~~
文摘Based on extensive literature search,the composition,pharmacology,clini cal applications of Passiflora foetida L,ecological characteristics were summarized with the aim to provide scientific data for further research and exploitation.
基金Project supported by the National Natural Science Foundation of China (No. 39770024).
文摘This study attempted to determine the characteristics of the communities, the ecological factors, and the denitrifying enzyme activity for denitrifying bacteria found in the paddy soils of the Taihu Lake Basin, China. Samples of the six main soil types of the basin were taken from paddy fields with different fertilities. The total numbers of bacteria and denitrifying bacteria in the high fertility soils were much more than those in low fertility soils, and the number of denitrifying bacteria accounted for 49% to 80% of the total number of bacteria. The O2 content was an important ecological factor that affected denitrification. Of test the strains isolated from the paddy soils in the Taihu Lake Basin, some (e.g., Pseudomonas spp.) grew well under low oxygen partial pressure, while others (e.g., Bacillus spp.) had no strict predilection with O2 content. Another critical ecological factor was the nitrogen concentration. Three selected denitrifying bacteria grew better in aculture medium with 135 instead of 276mg L^-1 nitrogen. At the same time 67% of the test strains were able to reduce NO3^- to NO2^- and 56% had N2O reductase.
基金funded by the Chinese National Key Projects for Basic Scientific Research (No.2009CB421303)the Chinese National Support Projects of Science and Technology (No.2011BAC07B02)+1 种基金the Strategic Leading Science and Technology Project of Chinese Academy of Sciences (No.XDA05050201-04-01)the Chinese National Science Foundation (No.41371053)
文摘This paper focuses on the growth response of Caragana microphylla seedlings to changes of artificially controlled water table in Horqin Sandy Land, China. Monitoring results of soil water content shows that soil moisture is closely correlated to groundwater depths. Soil volumetric water increased rapidly when close to water sources and finally stabilized in a saturated state. The soil moisture trend of CK （control） increased gradually at 0-50 cm of soil depth then decreased to 4% below 50 cm soil depth. C. microphylla can adapt to different soil environments by changes in ecological and physiological characteristics. By comparing the ecological characteristics of C. microphylla seedlings at various water tables, we found that a shallow water table of 40 cm depth inhibited seedling groundwater depth of 120 em was more advantageous for plant growth because of weak ecological characteristics. A height and canopy growth of C. microphylla seedlings. During the first two years, the most suitable water depth for root biomass was 120 cm, and 180 cm for root length. The growth of vertical roots is positively correlated with groundwater depth, and root thickness is the determinate factor for root biomass while the fine root is the determinate factor for root length. A thick root would grow much more in a natural drought environment while access to ground water promotes the growth of fine roots.
文摘The vegetation has been poisoned by gold in the western Guangdong-Hainan region. The gold content ofthe leaves there is as high as 10-1961 times the abundance, the chlorophyll content is 10%-30% lower thanthat of the vegetation in metamorphic terrains and 10%-20% higher than that in granite terrains, and thecarotenoid content is 10%-44% lower than the background value. The water content of leaves is 10% to 20%lower than the background value. The cells of leaves are deformed and broken. The leaf surface shows colourspots and becomes yellow or dark green. The spectral reflectance of the leaf surface is 5%-30% higher than thebackground value: the spectral shape has shifted 5-15 nm to the short wavelength. The gray scales of eanopyon images of Landsat TM and airborne imaging scanner (AIS) are 10%-100% higher than the backgroundvalues. On Landsat TM and AIS false colour images, plants poisoned by gold display a yellow color, whichdisinguishes them from background plants. According to the spectral and image features of goldbiogeochemical effects, the author has constructed a gold information system and expert prediction system,and thus two gold target areas and two gold prospect areas have been identified rapidly, economically andaccurately in the western Guangdong-Hainan region which is extensively covered by vegetation.
基金supported by Hunan Provincial Natural Science Foundation General Project,grant number 2023JJ306932023 Central South University Education and Teaching Reform Research Project,grant number 2023jy045-3Hunan Provincial Key Laboratory of Low Carbon Healthy Building
文摘The construction of an ecological security pattern(ESP)is an effective approach to addressing ecological concerns in urban agglomerations.However,previous research has often overlooked the ecological characteristics at different spatial scales,making it difficult to effectively tackle environmental issues.This study focuses on the Changsha–Zhuzhou–Xiangtan urban agglomeration(CZXUA)to construct an ESP from 2 scales:the urban agglomeration and the metropolitan area.First,ecological sources at different scales were identified and optimized using morphological spatial pattern analysis,ecosystem service supply assessment,landscape connectivity evaluation,and ecological demand intensity analysis.Next,spatial principal component analysis was employed to analyze resistance factors across different spatial scales,enabling the construction of a multi-scale landscape resistance surface.Finally,multi-scale ecological corridors were extracted using circuit theory,and the ecological corridors passing through the central urban area were optimized.As a result,176 ecological sources,337 ecological corridors,60 ecological pinch points,and 30 ecological barrier points were identified,forming the overall ESP for the CZXUA.Furthermore,an ecological protection and optimization pattern,described as“One River,Seven Waters,One Heart,and Eight Wedges”,was proposed based on the ESP.This pattern highlights pivotal areas for ecological protection and restoration within the national land space.This study provides a comprehensive example of constructing a multi-scale ecological corridor network and identifying critical areas for ecological protection and restoration.The findings can serve as a reference for special ecological protection planning in urban agglomerations.
