江苏省水土保持率阈值研究  

Study on threshold value of soil and water conservation rate in Jiangsu Province

作　　者：代梦梦 梁音[1] 童建 郭红丽[3] 杨逸辉[4] 吴芳 DAI Mengmeng;LIANG Yin;TONG Jian;GUO Hongli;YANG Yihui;WU Fang(State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;Soil and Water Conservation Ecological Environment Monitoring Station of Jiangsu Province,Nanjing 210012,China;Jiangsu Province Hydrology and Water Resources Investigation Bureau,Nanjing 210029,China;Water Resources Department of Jiangsu Province,Nanjing 210029,China;College of Advanced Agricultural Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008 [2]江苏省水土保持生态环境监测总站,江苏南京210012 [3]江苏省水文水资源勘测局,江苏南京210029 [4]江苏省水利厅,江苏南京210029 [5]中国科学院大学现代农业科学学院,北京100049

出　　处：《江苏水利》2022年第10期1-5,9,共6页Jiangsu Water Resources

基　　金：江苏省水利科技项目(2020051);江苏省水文局科技服务项目(JSSW201911005)。

摘　　要：综合考虑江苏省自然地理条件、区域综合发展水平与趋势,以2018年水土流失动态监测成果为基础,分析各土地利用类型、地形坡度、植被覆盖度等条件下的水土流失预防和治理潜力,确定江苏省2018年水土流失地块中不需治理和不可完全治理的面积,计算区域内土壤侵蚀强度在轻度以下的国土面积上限,从而确定水土保持率阈值。结果表明:(1)江苏省不需治理的水土流失地块由坡度≥35°的水土流失地块、坡度≤2°的旱地和水浇地、植被盖度≥75%的园林草地、裸露基岩组成,总面积为883.60 km^(2);(2)不可完全治理的水土流失地块由北方土石山区10°~25°零散分布的小面积坡耕地、部分生产建设造成的人为水土流失地块、部分河岸边坡水土流失地块组成,总面积为836.85 km^(2);(3)不需治理和不可完全治理的水土流失地块面积之和即为江苏省远期水土流失面积,共计1720.46 km^(2),即水土保持率阈值为98.32%。研究成果可为江苏省水土流失治理及成效评价提供依据。Comprehensively considering the natural geographical conditions,regional comprehensive development level and trends of Jiangsu Province,and based on the dynamic monitoring results of soil and water loss in 2018,the potential of soil and water loss prevention and control are analyzed under various land use types,slopes,vegetation coverage and other conditions,and the area that does not need to be treated and cannot be completely treated in the soil and water loss plots in Jiangsu Province in 2018 is determined.The study calculated the upper limit of the land area where the soil erosion intensity is less than mild,and determined the threshold value of soil and water conservation.The results show that:1)The soil erosion plots that do not need to be treated in Jiangsu Province are composed of soil erosion plots with a slope of≥35°,dry land and irrigated land with a slope of≤2°,garden grassland with a vegetation coverage of≥75%,and exposed bedrock,with a total area of 883.60 km^(2);2)The soil erosion plots that cannot be completely controlled are composed of 10°-25°scattered small plots of sloping farmland in the rocky mountain area of Northern China,man-made soil erosion plots caused by production and construction,and river bank slope soil erosion plots,with a total area of 836.85 km^(2);3)The total area of long-term soil erosion in Jiangsu Province was 1720.46 km^(2),that was,the threshold value of soil and water conservation rate was 98.32%.The research results can provide a basis for soil erosion control and effectiveness evaluation in Jiangsu Province.

关 键 词：水土保持率阈值 水土流失 地块 

分 类 号：S157[农业科学—土壤学]