China Seabuckthorn Ecological Project has been implemented for a decade (from 1999 to 2008) with an increasing seabuckthorn area of 1642.83 km2 in?the Sandstone Areas of Shanxi, Shaanxi and Inner Mongolia—the most se...China Seabuckthorn Ecological Project has been implemented for a decade (from 1999 to 2008) with an increasing seabuckthorn area of 1642.83 km2 in?the Sandstone Areas of Shanxi, Shaanxi and Inner Mongolia—the most serious soil erosion area in China. The vast artificial seabuckthorn forest’s value in environmental resource is assessed via 7 indicators on first-level, 15 indicators on secondary level and 35 indicators on third level in this research. As of 2008, the seabuckthorn environmental resource value is 10.017 billion RMB Yuan, which equals to 37.1 times of the project’s total investment of 0.27 billion RMB Yuan. It is proposed in this research that the external economical values such as soil and water conservation, windbreak and sand-fixation can be realized through relative national policies and taxes. Carbon-fixation and oxygen-producing value can be achieved through the international carbon trade.展开更多
The arid valley region in southeastern Tibet exemplifies an ecologically vulnerable area in southwestern China,where soil erosion has intensified in recent years as a consequence of socio-economic growth and infrastru...The arid valley region in southeastern Tibet exemplifies an ecologically vulnerable area in southwestern China,where soil erosion has intensified in recent years as a consequence of socio-economic growth and infrastructure construction.This study aimed to elucidate the mechanism by which freeze-thaw cycles affect soil erosion processes on the bare slopes of this alpine arid valley region under artificial distur-bances from engineering construction.Focusing on bare slopes with inclinations of 20°and 40°,we analyzed the impact of freeze-thaw cycles on flow and sand production through indoor artificial rainfall experiments.The findings indicated an approximately threefold increase in soil splattering following the freeze-thaw cycle compared to unfrozen slopes;cumulative flow production exhibited a declining trend,decreasing by 15.99%and 37.42%after the freeze-thaw cycle at slope angles of 20°and 40°,respectively;cumulative sand production increased by 2.29%and 51.24%after the freeze-thaw cycle at slope angles of 20°and 40°,respectively.On the freeze-thaw and unfrozen slopes,the sand production rates escalated swiftly following the initiation of flow production,reaching peaks of 1.34 g m^(-2)·min^(-1)and 1.52 g m^(-2)·min^(-1)in 10 min and 12 min,respectively.Post the freeze-thaw cycle,the rates stabilized,with the sand production rates on the freeze-thaw slopes exceeding those on the unfrozen slopes.These findings will serve as a significant reference for the management of bare ground surfaces and the conservation and restoration of biological environments following construction disturbances.展开更多
文摘China Seabuckthorn Ecological Project has been implemented for a decade (from 1999 to 2008) with an increasing seabuckthorn area of 1642.83 km2 in?the Sandstone Areas of Shanxi, Shaanxi and Inner Mongolia—the most serious soil erosion area in China. The vast artificial seabuckthorn forest’s value in environmental resource is assessed via 7 indicators on first-level, 15 indicators on secondary level and 35 indicators on third level in this research. As of 2008, the seabuckthorn environmental resource value is 10.017 billion RMB Yuan, which equals to 37.1 times of the project’s total investment of 0.27 billion RMB Yuan. It is proposed in this research that the external economical values such as soil and water conservation, windbreak and sand-fixation can be realized through relative national policies and taxes. Carbon-fixation and oxygen-producing value can be achieved through the international carbon trade.
基金supported by the National Natural Science Foundation of China(No.42371291 and No.41901234)the National Key R&D Program of China(2023YFF1304204)+3 种基金the National key research and development program(No.2019YFE0116500)the Geological Survey Project of China Geological Survey“Remote Sensing Monitoring and Evaluation of Human Activities in National Nature Reserves”(No.DD20230488)the National Forestry and Grassland Administration“Remote Sensing Monitoring Project For Human Activities in Terrestrial Nature Reserves”(300012000000244068)Data supports from projects of the National Natural Science Foundation of China(No.71225005)and the Exploratory Forefront Project for the Strategic Science Plan in IGSNRR,CAS are also appreciated.
文摘The arid valley region in southeastern Tibet exemplifies an ecologically vulnerable area in southwestern China,where soil erosion has intensified in recent years as a consequence of socio-economic growth and infrastructure construction.This study aimed to elucidate the mechanism by which freeze-thaw cycles affect soil erosion processes on the bare slopes of this alpine arid valley region under artificial distur-bances from engineering construction.Focusing on bare slopes with inclinations of 20°and 40°,we analyzed the impact of freeze-thaw cycles on flow and sand production through indoor artificial rainfall experiments.The findings indicated an approximately threefold increase in soil splattering following the freeze-thaw cycle compared to unfrozen slopes;cumulative flow production exhibited a declining trend,decreasing by 15.99%and 37.42%after the freeze-thaw cycle at slope angles of 20°and 40°,respectively;cumulative sand production increased by 2.29%and 51.24%after the freeze-thaw cycle at slope angles of 20°and 40°,respectively.On the freeze-thaw and unfrozen slopes,the sand production rates escalated swiftly following the initiation of flow production,reaching peaks of 1.34 g m^(-2)·min^(-1)and 1.52 g m^(-2)·min^(-1)in 10 min and 12 min,respectively.Post the freeze-thaw cycle,the rates stabilized,with the sand production rates on the freeze-thaw slopes exceeding those on the unfrozen slopes.These findings will serve as a significant reference for the management of bare ground surfaces and the conservation and restoration of biological environments following construction disturbances.
