基于CSLE模型的区域水土流失风险分析  

Regional soil erosion risk analysis based on CSLE model

作　　者：苏新宇 吴镇宇 刘霞[1] 唐俊[1] 李想[1] 赵传普 黎家作[2] 张春强[2] SU Xinyu;WU Zhenyu;LIU Xia;TANG Jun;LI Xiang;ZHAO Chuanpu;LI Jiazuo;ZHANG Chunqiang(Collaborative Innovation Center of Sustainable Forestry in Southern China of Jiangsu Province, Nanjing Forestry University, Jiangsu Provincial Key Lab of Soil Erosion and Ecological Restoration, 210037, Nanjing, China;Huaihe River Basin Water and Soil Conservation Monitoring Center Station, 233001, Bengbu, Anhui, China)

机构地区：[1]南京林业大学南方现代林业协同创新中心,江苏省水土保持与生态修复重点实验室,南京210037 [2]淮河水利委员会淮河流域水土保持监测中心站,安徽蚌埠233001

出　　处：《中国水土保持科学》2021年第5期27-36,共10页Science of Soil and Water Conservation

基　　金：全国水土流失动态监测与公告项目“基于遥感和CSLE模型的淮河流域重点区域水土流失监测与评价”(SBJ2018010);山东省水土流失动态监测项目(SWJ201801);国家自然科学基金“沂蒙山区退耕坡地土壤结构与入渗动态及分形学机理”(31070627);江苏省“333工程”科研项目(BRA2019069)。

摘　　要：为探究区域水土流失风险及其空间差异,支撑区域水土流失治理、规划及评价。以CSLE模型为基础,在GIS与RS支撑下,采用多阶自然断点法和空间叠置分析法,对国家级重点治理区蒙阴县开展水土流失风险评估,并对其空间分布特征和风险性关系进行分析。结果表明:1)水土流失风险及其风险因子呈现南北风险高、中部风险低的特点,“较高”和“高”风险等级主要分布在垛庄镇、岱崮镇、野店镇和坦埠镇;2)山地丘陵水土流失风险明显高于平原,“较高”和“高”风险主要集中于8°~15°、15°~25°坡度等级,“中等”和“低”风险随海拔与地表起伏高度增加,在各地貌类型中分布面积占比呈增加趋势;3)城镇村建设用地、交通运输用地、水域及水利设施用地均为“无”风险,水“较高”和“高”风险主要分布在坡耕地、坡地果园与采矿用地;4)林草地中“较高”和“高”风险主要分布在中覆盖及其以下等级,园地则集中在低覆盖和中低覆盖等级。在未来的水土流失防治和水土保持规划工作中,应以水土流失风险较高的区域为重点对象。[Background]The risk of soil and water loss can better reflect the spatial difference of soil erosion in the region.It is of great practical significance to the rational allocation of soil and water conservation measures and the formulation of soil and water conservation policies.This work aims to explore the risk of soil and water loss and its spatial differences,and support the management,planning and evaluation of soil and water loss.[Methods]Based on CSLE model and supported by GIS and RS,this paper adopted multi-stage natural breakpoint method and spatial superposition analysis method,to carry out soil and water loss risk assessment in Mengyin county,a national key governance area.The spatial distribution characteristics and risk relationship were analyzed.[Results]1)The risk of soil and water loss and its risk factors were high in the south and north,but low in the middle.The“relatively high”and“high”risk levels were mainly distributed in Duzhuang,Dagu,Yedian and Tanbu towns.2)The risk of soil and water loss in mountainous and hilly areas was significantly higher than that in plain areas.The“relatively high”and“high”risks were mainly concentrated in slope grades of 8°-15°and 15°-25°.The“medium”and“low”risks increased with elevation and surface undulation height,and the distribution area of the“medium”and“low”risks increased in each geomorphic type.3)There was no risk for urban and village construction land,transportation land,water area and water conservancy facilities land,and the“relatively high”and“high”water risks were mainly distributed in slope farmland,slope orchard and mining land.4)The“relatively high”and“high”risks of forest and grass land were mainly distributed in the middle and lower cover levels,while those of orchard land were mainly distributed in the low and middle and low cover levels.[Conclusions]In the future soil and water loss prevention and conservation planning work,it is necessary to focus on areas with high risk of soil and water

关 键 词：CSLE RS GIS 水土流失风险 蒙阴县 

分 类 号：S157[农业科学—土壤学]