[Objectives]To explore the characteristics of land use change and its main influencing factors in Mojiang County from 2000 to 2020,and try to provide a scientific reference for alleviating the contradiction between ma...[Objectives]To explore the characteristics of land use change and its main influencing factors in Mojiang County from 2000 to 2020,and try to provide a scientific reference for alleviating the contradiction between man and land in Mojiang County and realizing the sustainable development of regional land resources.[Methods]Based on the land cover data and socio-economic data of Mojiang County from 2000 to 2020,the dynamic degree of land use,land use transfer matrix and center-of-gravity transfer model were calculated,and the temporal and spatial change characteristics and driving factors of various types of land use were calculated by PLUS model.[Results]From 2000 to 2020,the area and proportion of grassland,waters and construction land in Mojiang County showed an upward trend,while the area and proportion of cultivated land and forest land showed a downward trend.Among them,cultivated land was mainly converted into forest land and grassland,and some were converted into waters and construction land;forest land was mainly converted into cultivated land and grassland,and part of it was converted into waters and construction land.From 2000 to 2020,the center-of-gravity of cultivated land,forest land and construction land in Mojiang County moved to the southeast of the county,and the moving rates were 0.66,1.97 and 10.58 km/yr,respectively;the center-of-gravity of grassland and waters moved to the southwest of the county,and the moving rates were 1.30 and 20.20 km/yr,respectively.Distance from road,distance from government and distance from waters are the main driving forces affecting land use change in Mojiang County;the forecast shows that in 2040,the area of grassland and forest land in Mojiang County will continue to decrease,the area of cultivated land will turn to rise,and the area of waters and construction land will continue to rise.[Conclusions]Reasonable planning and optimizing the allocation of cultivated land and forest land structure and strict control of the expansion scale of construction land are necessary measures to ensure the coordinated development of regional land rational use and economic construction.展开更多
To comprehensively evaluate the alterations in water ecosystem service functions within arid watersheds,this study focused on the Bosten Lake Basin,which is situated in the arid region of Northwest China.The research ...To comprehensively evaluate the alterations in water ecosystem service functions within arid watersheds,this study focused on the Bosten Lake Basin,which is situated in the arid region of Northwest China.The research was based on land use/land cover(LULC),natural,socioeconomic,and accessibility data,utilizing the Patch-level Land Use Simulation(PLUS)and Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)models to dynamically assess LULC change and associated variations in water yield and water conservation.The analyses included the evaluation of contribution indices of various land use types and the investigation of driving factors that influence water yield and water conservation.The results showed that the change of LULC in the Bosten Lake Basin from 2000 to 2020 showed a trend of increasing in cultivated land and construction land,and decreasing in grassland,forest,and unused land.The unused land of all the three predicted scenarios of 2030(S1,a natural development scenario;S2,an ecological protection scenario;and S3,a cultivated land protection scenario)showed a decreasing trend.The scenarios S1 and S3 showed a trend of decreasing in grassland and increasing in cultivated land;while the scenario S2 showed a trend of decreasing in cultivated land and increasing in grassland.The water yield of the Bosten Lake Basin exhibited an initial decline followed by a slight increase from 2000 to 2020.The areas with higher water yield values were primarily located in the northern section of the basin,which is characterized by higher altitude.Water conservation demonstrated a pattern of initial decrease followed by stabilization,with the northeastern region demonstrating higher water conservation values.In the projected LULC scenarios of 2030,the estimated water yield under scenarios S1 and S3 was marginally greater than that under scenario S2;while the level of water conservation across all three scenarios remained rather consistent.The results showed that Hejing County is an important water conservation function zone,and the eastern part of the Xiaoyouledusi Basin is particularly important and should be protected.The findings of this study offer a scientific foundation for advancing sustainable development in arid watersheds and facilitating efficient water resource management.展开更多
The potential energy difference of trivalent Pr/Nd complex ions with various α hydroxyl carboxylic acids were computed by molecular mechanics plus(MM +) model. Its relationships with the steric hindrance of the...The potential energy difference of trivalent Pr/Nd complex ions with various α hydroxyl carboxylic acids were computed by molecular mechanics plus(MM +) model. Its relationships with the steric hindrance of the coordinating lignads and with the separation factor of Pr/Nd were discussed. It is found that the MM + model can be used for selecting and designing ligand as effective eluant, with which Pr 3+ and Nd 3+ can be separated by ion exchange chromatography.展开更多
China’s policy on cropland protection is a fundamental agricultural policy,which supports the state’s sustainable development goals of eradicating hunger,achieving food security,improving nutrition and promoting sus...China’s policy on cropland protection is a fundamental agricultural policy,which supports the state’s sustainable development goals of eradicating hunger,achieving food security,improving nutrition and promoting sustainable agriculture.We combined the SD and PLUS models to construct an integrated framework for simulating future areas of cropland and their spatial distribution.We simulated the spatial and temporal changes in cropland in Guangxi Autonomous Region under different scenarios in 2030,2040 and 2050.The results showed that the simulation error for historical cropland areas using the SD model was≤3%.The PLUS model results for the spatial distribution of cropland in Guangxi in 2020 was 0.92 for overall accuracy(OA),0.77 for Kappa,and 0.33 for the figure of merit(FOM).Thus,the integrated model was suitable for simulating cropland in Guangxi under different future scenarios.Analyses of the landscape index,standard deviation ellipse and hot spots were performed to examine the spatial and temporal distribution characteristics of Guangxi’s cropland under different future scenarios in more detail.They indicated that the area of cropland in Guangxi under different future scenarios gradually decreased,with the SSP245 scenario showing the greatest decrease in the area of cropland.Cropland in Guangxi showed a westward shift under different future scenarios,which was most rapid under the SSP245 scenario.cropland remained fragmented from 2000 to 2020,with fragmentation intensifying under different future scenarios,while cropland shifted to western rocky,desertified and poverty-affected areas.In sum,the results show that the SD-PLUS integrated model can predict the change trend of cropland in Guangxi under different future scenarios,which facilitates optimisation of the spatial allocation and planning of cropland and provides key data for implementing future cropland protection policies in Guangxi.展开更多
Ecosystem services values(ESV)are increasingly affected by land use land cover change(LULCC)in Côte d’Ivoire.However,there is a scarcity of studies to understand the current state of the ecological environment a...Ecosystem services values(ESV)are increasingly affected by land use land cover change(LULCC)in Côte d’Ivoire.However,there is a scarcity of studies to understand the current state of the ecological environment and the factors that influence the change of ESV in Côte d’Ivoire.This study aimed to quantify LULCC and the ESV change in Côte d’Ivoire from 1990 to 2040.The method-ology used in this study is based on evaluating the change in land use and ESV from 1990 to 2020 and predicting the land cover in 2040 with a cellular au-tomata(CA)based PLUS model.Our results demonstrated that vegetation cover is predicted to decrease by 0.370%per year from 2020 to 2040.Culti-vated land is predicted to increase by 0.013%per year from 2020 to 2040.From 2020 to 2040,hotspots of ESV changes are predicted to mainly appear in the Tchologo and Hambol regions.Our results demonstrated that ecosystem management should be made to control cultivated land expansion and protect wetland,and forestland for more sustainable ecosystem services.Ecosystem management to mitigate vegetation loss is necessary to help decisions mak-ers to manage land use,facilitate land use expansion and protect the eco-system.展开更多
文摘[Objectives]To explore the characteristics of land use change and its main influencing factors in Mojiang County from 2000 to 2020,and try to provide a scientific reference for alleviating the contradiction between man and land in Mojiang County and realizing the sustainable development of regional land resources.[Methods]Based on the land cover data and socio-economic data of Mojiang County from 2000 to 2020,the dynamic degree of land use,land use transfer matrix and center-of-gravity transfer model were calculated,and the temporal and spatial change characteristics and driving factors of various types of land use were calculated by PLUS model.[Results]From 2000 to 2020,the area and proportion of grassland,waters and construction land in Mojiang County showed an upward trend,while the area and proportion of cultivated land and forest land showed a downward trend.Among them,cultivated land was mainly converted into forest land and grassland,and some were converted into waters and construction land;forest land was mainly converted into cultivated land and grassland,and part of it was converted into waters and construction land.From 2000 to 2020,the center-of-gravity of cultivated land,forest land and construction land in Mojiang County moved to the southeast of the county,and the moving rates were 0.66,1.97 and 10.58 km/yr,respectively;the center-of-gravity of grassland and waters moved to the southwest of the county,and the moving rates were 1.30 and 20.20 km/yr,respectively.Distance from road,distance from government and distance from waters are the main driving forces affecting land use change in Mojiang County;the forecast shows that in 2040,the area of grassland and forest land in Mojiang County will continue to decrease,the area of cultivated land will turn to rise,and the area of waters and construction land will continue to rise.[Conclusions]Reasonable planning and optimizing the allocation of cultivated land and forest land structure and strict control of the expansion scale of construction land are necessary measures to ensure the coordinated development of regional land rational use and economic construction.
基金This research was supported by the Special Project for the Construction of Innovation Environment in the Autonomous Region(2022D04007)the National Natural Science Foundation of China(42361030).
文摘To comprehensively evaluate the alterations in water ecosystem service functions within arid watersheds,this study focused on the Bosten Lake Basin,which is situated in the arid region of Northwest China.The research was based on land use/land cover(LULC),natural,socioeconomic,and accessibility data,utilizing the Patch-level Land Use Simulation(PLUS)and Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)models to dynamically assess LULC change and associated variations in water yield and water conservation.The analyses included the evaluation of contribution indices of various land use types and the investigation of driving factors that influence water yield and water conservation.The results showed that the change of LULC in the Bosten Lake Basin from 2000 to 2020 showed a trend of increasing in cultivated land and construction land,and decreasing in grassland,forest,and unused land.The unused land of all the three predicted scenarios of 2030(S1,a natural development scenario;S2,an ecological protection scenario;and S3,a cultivated land protection scenario)showed a decreasing trend.The scenarios S1 and S3 showed a trend of decreasing in grassland and increasing in cultivated land;while the scenario S2 showed a trend of decreasing in cultivated land and increasing in grassland.The water yield of the Bosten Lake Basin exhibited an initial decline followed by a slight increase from 2000 to 2020.The areas with higher water yield values were primarily located in the northern section of the basin,which is characterized by higher altitude.Water conservation demonstrated a pattern of initial decrease followed by stabilization,with the northeastern region demonstrating higher water conservation values.In the projected LULC scenarios of 2030,the estimated water yield under scenarios S1 and S3 was marginally greater than that under scenario S2;while the level of water conservation across all three scenarios remained rather consistent.The results showed that Hejing County is an important water conservation function zone,and the eastern part of the Xiaoyouledusi Basin is particularly important and should be protected.The findings of this study offer a scientific foundation for advancing sustainable development in arid watersheds and facilitating efficient water resource management.
文摘The potential energy difference of trivalent Pr/Nd complex ions with various α hydroxyl carboxylic acids were computed by molecular mechanics plus(MM +) model. Its relationships with the steric hindrance of the coordinating lignads and with the separation factor of Pr/Nd were discussed. It is found that the MM + model can be used for selecting and designing ligand as effective eluant, with which Pr 3+ and Nd 3+ can be separated by ion exchange chromatography.
文摘China’s policy on cropland protection is a fundamental agricultural policy,which supports the state’s sustainable development goals of eradicating hunger,achieving food security,improving nutrition and promoting sustainable agriculture.We combined the SD and PLUS models to construct an integrated framework for simulating future areas of cropland and their spatial distribution.We simulated the spatial and temporal changes in cropland in Guangxi Autonomous Region under different scenarios in 2030,2040 and 2050.The results showed that the simulation error for historical cropland areas using the SD model was≤3%.The PLUS model results for the spatial distribution of cropland in Guangxi in 2020 was 0.92 for overall accuracy(OA),0.77 for Kappa,and 0.33 for the figure of merit(FOM).Thus,the integrated model was suitable for simulating cropland in Guangxi under different future scenarios.Analyses of the landscape index,standard deviation ellipse and hot spots were performed to examine the spatial and temporal distribution characteristics of Guangxi’s cropland under different future scenarios in more detail.They indicated that the area of cropland in Guangxi under different future scenarios gradually decreased,with the SSP245 scenario showing the greatest decrease in the area of cropland.Cropland in Guangxi showed a westward shift under different future scenarios,which was most rapid under the SSP245 scenario.cropland remained fragmented from 2000 to 2020,with fragmentation intensifying under different future scenarios,while cropland shifted to western rocky,desertified and poverty-affected areas.In sum,the results show that the SD-PLUS integrated model can predict the change trend of cropland in Guangxi under different future scenarios,which facilitates optimisation of the spatial allocation and planning of cropland and provides key data for implementing future cropland protection policies in Guangxi.
文摘Ecosystem services values(ESV)are increasingly affected by land use land cover change(LULCC)in Côte d’Ivoire.However,there is a scarcity of studies to understand the current state of the ecological environment and the factors that influence the change of ESV in Côte d’Ivoire.This study aimed to quantify LULCC and the ESV change in Côte d’Ivoire from 1990 to 2040.The method-ology used in this study is based on evaluating the change in land use and ESV from 1990 to 2020 and predicting the land cover in 2040 with a cellular au-tomata(CA)based PLUS model.Our results demonstrated that vegetation cover is predicted to decrease by 0.370%per year from 2020 to 2040.Culti-vated land is predicted to increase by 0.013%per year from 2020 to 2040.From 2020 to 2040,hotspots of ESV changes are predicted to mainly appear in the Tchologo and Hambol regions.Our results demonstrated that ecosystem management should be made to control cultivated land expansion and protect wetland,and forestland for more sustainable ecosystem services.Ecosystem management to mitigate vegetation loss is necessary to help decisions mak-ers to manage land use,facilitate land use expansion and protect the eco-system.
