退耕还林和气候变化对长江流域土壤侵蚀减少的影响  

Impact of the Grain-for-Green Programme and climate change on the soil erosion decline in the Yangtze River,China

作　　者：李柏延 王昀琛 LI Boyan;WANG Yunchen(School of Geography and Tourism,Shaanxi Normal University,Xi’an,710119,China;School of Computer Science and Technology,Xi’an University of Posts and Telecommunications,Xi’an,710121,China)

机构地区：[1]School of Geography and Tourism,Shaanxi Normal University,Xi’an,710119,China [2]School of Computer Science and Technology,Xi’an University of Posts and Telecommunications,Xi’an,710121,China

出　　处：《Journal of Geographical Sciences》2024年第3期527-542,共16页地理学报（英文版）

基　　金：National Natural Science Foundation of China,No.42101259,No.42371101,No.42301455;Qin Chuangyuan Cites High-level Innovation or Entrepreneurship Talent Project,No.QCYRCXM-2023-066;Fifth Batch Special Funding(Pre-Station)from China Postdoctoral Science Foundation,No.2023TQ0207;Fundamental Research Funds for the Central Universities,No.GK202304024,No.1110011297,No.1112010355;Teaching Reform Project of Shaanxi University,No.23GGYS-JG06。

摘　　要：The area of land that is affected by soil erosion in the Yangtze River has been reduced by 146,000 km~2(accounting for 27%of the entire Yangtze River)since 2000.However,the contributions of different tributaries to this soil erosion decline and the underlying causes have not been determined.Here we quantify the soil erosion decline in the Yangtze River and the impacts of the Grain-for-Green Programme(GFGP)and climate change using the RUSLE model and statistical methods.The results were as follows:(1)After the implementation of the GFGP,soil erosion decreased in ten sub-basins excluding the Dongting Lake catchment;(2)Soil erosion was mainly affected by the GFGP and the rainfall erosivity.Specifically,the contributions of the GFGP and rainfall erosivity to soil erosion decline are estimated to be 70.12%and 29.88%,respectively.(3)“Scenario#9”means the combination of slope(15°-25°)of retired farmland converted to shrub land and slope(>25°)of retired farmland converted to grassland.Considering scenario feasibility and management targets,Scenario#9 was the most appropriate land use scenario for the Yangtze River.This study offers insights into managing and reducing soil erosion in the future.

关 键 词：soil erosion RUSLE model Grain for Green Programme climate change Yangtze River 

分 类 号：S157.1[农业科学—土壤学] P467[农业科学—农业基础科学]