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文章摘要

基于CSLE模型的普者黑流域土壤侵蚀特征与影响因素分析

Characteristics and Influencing Factors of Soil Erosionin Puzhehei Watershed Based on CSLE Mode

DOI：

英文关键词: Soil erosion CSLE model Spatio temporal evolution Influencing factors Puzhehei Watershed

基金项目:国家自然科学基金资助项目（41761081）；云南省社科规划办重点基金资助项目（ZD202218）

作者	单位
杨艳梅	昆明理工大学国土资源工程学院
黄义忠	昆明理工大学国土资源工程学院

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中文摘要:

利用CSLE模型对普者黑流域2009年和2019年的土壤侵蚀开展定量评价，分析土壤侵蚀时空演变特征与影响因素。结果表明，〖JP2〗该流域降雨侵蚀力因子R值范围为3 63045 MJ·mm/（hm2·h·a）～4 92338 MJ·mm/（hm2·h·a），〖JP〗呈明显自西向东递增的趋势；土壤可蚀性因子K值范围为0011 4 t·h/（MJ·mm）～0020 4 t·h/（MJ·mm），地形因子LS值范围为0～31566，二者高值区域均分布在流域中部；植被覆盖与生物措施因子B值减小，流域植被覆盖情况转好；工程措施因子E值无明显变化。流域总体土壤侵蚀发生率基本不变，土壤侵蚀处于转好态势，平均土壤侵蚀模数M值随坡度等级升高而增大，随高程等级升高先增大后减小；不同土地利用类型的M值大小依次为未利用地＞林地＞草地＞耕地＞园地。

英文摘要:

Based on CSLE model， the soil erosion in Puzhehei Watershed in 2009 and 2019 was quantitative evaluated to analyze its temporal and spatial evolution 〖JP2〗characteristics and influencing factors. The results indicated that the rainfall erosivity factor R in Puzhehei Watershed ranged from 3 63045 MJ·mm/（hm2·h·a）〖JP〗 to 4 92338 MJ·mm/（hm2·h·a）， showing a significant increasing trend from west to east. The soil erodibility factor K ranged from 0011 4 t·h/（MJ·mm） to 0020 4 t·h/（MJ·mm）， and the topographic factor LS ranged from 0 to 31566， the high value areas of both were distributed in the middle of the watershed. With the decrease of vegetation cover and biological measure factor B， the vegetation cover in the watershed improved. There was no significant change in the engineering measure factor E. Overall， the incidence of soil erosion in the watershed remained unchanged， and soil erosion was in a trend of improvement. The average soil erosion modulus M increased with the rise of slope grade， and first increased and then decreased with the increase of elevation level. The M values of different land use types were arranged in order from largest to smallest as unused land， forest land， grassland， cultivated land and garden land.

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