基于多元隶属度的区域水土流失评价方法——以鄂东大别山区为例

Region-scaled Soil Loss Assessment Approach Based on Multi-Membership—— A Case study in E＇Dong Mountain

水土流失严重威胁着区域生态环境,因此评价水土流失状况对区域水土流失治理具有重要意义,基于此提出了一种基于多元隶属度的区域水土流失定性评价方法。该方法通过选取表征区域特征的水土流失影响因子指标,并以径流场观测小区所获得数据为样本,采用模糊数学方法构建水土流失评价强度与其影响因子之间的多元隶属函数并依据隶属度划分水土流失强度等级分类,然后应用遥感、GIS等技术工具提取研究区评价单元的评价指标参数,由构造的多元隶属度模型确定其对应的强度等级。该模型以鄂东大别山作为研究区域进行模型验证,结果表明,这种方法在划分水土流失强度上比较科学、合理。

Soil erosion is a serious environmental problem, so it is essential to evaluate region-scaled soil erosion status for decision and guide of water and soil conservation. This paper presents a region-scaled soil erosion qualitative evaluation approach based on multi-membership, according to choose the regional characteristic indexes of soil erosion affected factors firstly, then construct a multi-membership function of soil erosion intensity in terms of correlative affected factors, and rank the soil erosion intensity by membership grade based on the observed plot data. In addition, assesses the rank of soil erosion intensity of unit cells of evaluated region by the constructed multi-membership function and classified set of soil erosion intensity according to the affected factors parameters of soil erosion abstracted by GIS and remote sensing technology. The approach is logical to rank soil erosion intensity tested by E＇Dong mountain data.