In recent years,intensified land use change driven by climate change and human activities have markedly impacted the ecological environmental quality of the arid inland river basins.The implementation of forestry proj...In recent years,intensified land use change driven by climate change and human activities have markedly impacted the ecological environmental quality of the arid inland river basins.The implementation of forestry projects,coupled with continuous population growth,has increased the need for systematic assessments of ecological effects to ensure sustainable development in arid inland river basins.This study generated a 22-a(2000-2021)remote sensing ecological index(RSEI)data series for the Manas River Basin,a typical arid inland river basin in China,utilizing Moderate Resolution Imaging Spectroradiometer(MODIS)data and the Google Earth Engine(GEE)platform.We examined the spatiotemporal patterns of ecological environmental quality in the Manas River Basin through the Theil-Sen estimator,Mann-Kendall trend test,coefficient of variation(CV),and Hurst index.Furthermore,we employed the Optimal Parameter-based Geographical Detector(OPGD)method to quantify the influence of seven key drivers:elevation,slope,temperature,precipitation,gross domestic product(GDP),population density,and land use change.The key findings revealed that the basin's ecological environmental quality showed significant improvement(mean RSEI of 0.38,with a range of 0.34-0.41),with areas exhibiting good and excellent grades increasing by 16.71%,particularly in the midstream oasis region and upstream mountainous region,while areas exhibiting poor and relatively poor grades decreased by 11.52%in the downstream desert region.Spatial heterogeneity of ecological environmental quality was pronounced,with 32.23%of the areas showing localized degradation,the midstream oasis region exhibiting sustainable recovery potential(Hurst index>0.50),and only 36.67%of the areas maintaining stable and highly stable conditions(primarily in the upstream mountainous region).The OPGD analysis revealed that temperature(q-value=0.496-0.780),land use change(q-value=0.705-0.782),and elevation(q-value=0.245-0.637)were dominant factors,with the influence of land use change increasing during 2000-2020.Strong interaction effects emerged between land use change and temperature(q-value>0.705)and between land use change and elevation(q-value=0.751 in 2020),highlighting intensified human-nature coupling.These findings provide vital perspectives for ecosystem management in arid inland river basins under both climate and anthropogenic pressures.展开更多
As one of China's most important ecological conservation regions,the source region of the Yellow River(SRYR)has a fragile ecological environment.Investigating land use transformations and their ecological conseque...As one of China's most important ecological conservation regions,the source region of the Yellow River(SRYR)has a fragile ecological environment.Investigating land use transformations and their ecological consequences in this region is of great significance for optimizing territorial spatial structure and promoting regional sustainable development.Based on the dominant functions of production-living-ecological space(PLES),we employed the land use transfer matrix and the standard deviational ellipse method to elucidate the spatiotemporal evolution characteristics of PLES in the SRYR from 2000 to 2020.Furthermore,the mechanism underlying the differentiation of eco-environmental effects in this region was explored using the optimal parameter-based geographical detector(OPGD)model.Results indicated that ecological space predominated within the PLES of the SRYR,accounting for approximately 98.74%of the total area.Living space was sparsely distributed in township areas with a proportion below 1.00%.Production space was mainly distributed in Guinan County and Gonghe County,accounting for about 1.16%of the area.In terms of the temporal scale,during 2000–2020,the overall eco-environmental quality of the SRYR exhibited an improving trend,primarily driven by the conversion of other ecological spaces into grassland ecological space.Interaction detection results revealed that the interaction between normalized difference vegetation index and gross domestic product was the strongest.In addition,the interaction between precipitation and temperature showed a significant bilinear enhancement effect.This finding suggests that the variations in eco-environmental quality in the SRYR during 2000–2020 have been jointly influenced by natural,climatic,and human factors.This study helps to provide a scientific basis for the rational layout of PLES and guiding ecological restoration efforts in the SRYR.展开更多
基金supported by the National Natural Science Foundation of China(32360084).
文摘In recent years,intensified land use change driven by climate change and human activities have markedly impacted the ecological environmental quality of the arid inland river basins.The implementation of forestry projects,coupled with continuous population growth,has increased the need for systematic assessments of ecological effects to ensure sustainable development in arid inland river basins.This study generated a 22-a(2000-2021)remote sensing ecological index(RSEI)data series for the Manas River Basin,a typical arid inland river basin in China,utilizing Moderate Resolution Imaging Spectroradiometer(MODIS)data and the Google Earth Engine(GEE)platform.We examined the spatiotemporal patterns of ecological environmental quality in the Manas River Basin through the Theil-Sen estimator,Mann-Kendall trend test,coefficient of variation(CV),and Hurst index.Furthermore,we employed the Optimal Parameter-based Geographical Detector(OPGD)method to quantify the influence of seven key drivers:elevation,slope,temperature,precipitation,gross domestic product(GDP),population density,and land use change.The key findings revealed that the basin's ecological environmental quality showed significant improvement(mean RSEI of 0.38,with a range of 0.34-0.41),with areas exhibiting good and excellent grades increasing by 16.71%,particularly in the midstream oasis region and upstream mountainous region,while areas exhibiting poor and relatively poor grades decreased by 11.52%in the downstream desert region.Spatial heterogeneity of ecological environmental quality was pronounced,with 32.23%of the areas showing localized degradation,the midstream oasis region exhibiting sustainable recovery potential(Hurst index>0.50),and only 36.67%of the areas maintaining stable and highly stable conditions(primarily in the upstream mountainous region).The OPGD analysis revealed that temperature(q-value=0.496-0.780),land use change(q-value=0.705-0.782),and elevation(q-value=0.245-0.637)were dominant factors,with the influence of land use change increasing during 2000-2020.Strong interaction effects emerged between land use change and temperature(q-value>0.705)and between land use change and elevation(q-value=0.751 in 2020),highlighting intensified human-nature coupling.These findings provide vital perspectives for ecosystem management in arid inland river basins under both climate and anthropogenic pressures.
基金financially supported by the Qinghai Provincial Applied Basic Research Program,China(2024-ZJ-953)。
文摘As one of China's most important ecological conservation regions,the source region of the Yellow River(SRYR)has a fragile ecological environment.Investigating land use transformations and their ecological consequences in this region is of great significance for optimizing territorial spatial structure and promoting regional sustainable development.Based on the dominant functions of production-living-ecological space(PLES),we employed the land use transfer matrix and the standard deviational ellipse method to elucidate the spatiotemporal evolution characteristics of PLES in the SRYR from 2000 to 2020.Furthermore,the mechanism underlying the differentiation of eco-environmental effects in this region was explored using the optimal parameter-based geographical detector(OPGD)model.Results indicated that ecological space predominated within the PLES of the SRYR,accounting for approximately 98.74%of the total area.Living space was sparsely distributed in township areas with a proportion below 1.00%.Production space was mainly distributed in Guinan County and Gonghe County,accounting for about 1.16%of the area.In terms of the temporal scale,during 2000–2020,the overall eco-environmental quality of the SRYR exhibited an improving trend,primarily driven by the conversion of other ecological spaces into grassland ecological space.Interaction detection results revealed that the interaction between normalized difference vegetation index and gross domestic product was the strongest.In addition,the interaction between precipitation and temperature showed a significant bilinear enhancement effect.This finding suggests that the variations in eco-environmental quality in the SRYR during 2000–2020 have been jointly influenced by natural,climatic,and human factors.This study helps to provide a scientific basis for the rational layout of PLES and guiding ecological restoration efforts in the SRYR.
