水土保持学报2017，Vol.31Issue(3)：16-21,26,7.DOI:10.13870/j.cnki.stbcxb.2017.03.003
基于CSLE模型的贵州省水土流失规律分析
Analysis of the Characteristics of Soil and Water Loss in Guizhou Province Based on CSLE
摘要
Abstract
To explore the characteristics of soil and water loss in the Karst region,we analyzed the spatial statistic features and soil erosion characteristics of blocks.According to the First National Water Census,field surveys were carried out using blocks as the minimum survey units.A block is an area in which land use,soil and water conservation measures and coverage are identical.Soil erosion modulus was calculated using the CSLE (Chinese Soil Loss Equation) model.The results showed that farmland and forest were dominated in the Karst region,accounting for 86.2％ of the total area.Because of cracked terrain and steep slopes,the landscape showed fragmentation characteristics.The average area,slope length,slope gradient of blocks were 3.45 hm2,45.3 m,and 21.7°,respectively.Analysis of the erosion modulus showed that 68.6％ of farmland blocks had steep gradients and accounted for 65.6％ of the total sediment yield.About 50 ％ of farmland suffered severe erosion.The effects of slope gradient on soil erosion were significantly greater than that of slope length.Engineering measures reduced soil erosion by 75％.With the increase of slope gradient,the efficiency of engineering measures in reducing soil erosion decreased and became smaller than that of the forest and grassland.The most serious soil erosion occurred in southwest of Guizhou Province,and the degree of soil erosion decreased from west to east.When planning for regional soil and water conservation,the most seriously eroded area should be given the primary consideration,and reducing cultivation on steep slopes and returning farmland to forest should become the first choice.关键词
喀斯特/土地利用/水土流失/CSLEKey words
Karst/land utilization/soil and water loss/CSLE分类
农业科技引用本文复制引用
陈美淇,魏欣,张科利,陈月红..基于CSLE模型的贵州省水土流失规律分析[J].水土保持学报,2017,31(3):16-21,26,7.基金项目
水利部公益性行业科研专项“水土保持生态效应监测与评价技术研究”(201501045) （201501045）
国家重点研发计划项目“近年来国家重大生态工程关键技术评估”(2016YFC0503704) （2016YFC0503704）
