洱海流域土壤侵蚀强度时空变化及景观格局分析  

Spatial-temporal variations of soil erosion intensity and landscape pattern analysis in Erhai Lake basin

作　　者：王钰 董亚坤 何紫玲 王鹏 赵昊 曾维军 WANG Yu;DONG Yakun;HE Ziling;WANG Peng;ZHAO Hao;ZENG Weijun(College of Water Resources,Yunnan Agricultural University,Kunming Yunnan 650201;Yunnan Intermountain Basin Land Use Field Research Station,Ministry of Natural Resources,Kunming Yunnan 650201;Yunnan International Joint R&D Center of Smart Agriculture and Water Security,Kunming Yunnan 650201;College of Resources and Environment,Yunnan Agricultural University,Kunming Yunnan 650201)

机构地区：[1]云南农业大学水利学院,云南昆明650201 [2]自然资源部云南山间盆地土地利用野外科学观测研究站,云南昆明650201 [3]云南省智慧农业与水安全国际联合研发中心,云南昆明650201 [4]云南农业大学资源与环境学院,云南昆明650201

出　　处：《环境污染与防治》2024年第5期626-630,共5页Environmental Pollution & Control

基　　金：国家自然科学基金地区项目(No.41961040);云南省农业联合专项面上项目(No.202101BD070001-101)。

摘　　要：采用改进的土壤流失方程(RUSLE)及热点分析研究了洱海流域2000—2020年的土壤侵蚀强度时空变化,并应用Fragstats软件从类型水平与景观水平分析土壤侵蚀影响下的景观格局变化趋势。结果表明:(1)20年间,年平均土壤侵蚀模数持续下降,微度侵蚀类型面积增加,而更强侵蚀类型的面积减少,说明洱海流域土壤侵蚀状况得到改善。(2)随着坡度增大,洱海流域年平均土壤侵蚀模数先增大后减小,在坡度为15°~25°时达到最大。(3)2000—2020年,洱海流域的景观格局也得到了优化。The spatial-temporal variations of soil erosion tensity in Erhai Lake basin were studied by using RUSLE and hotspot analysis,the Fragstats software was used to analyze the change trend of landscape pattern influenced by soil erosion from type and landscape levels.Results showed that:(1)during the 20 years,annual average soil erosion modulus decreased consisitently.The area of micro-erosion intensity increased,but that of the other stronger intensities decreased.In conclusion,the status of soil erosion in Erhai Lake basin improved.(2)With the increase of the slope,annual average soil erosion modulus firstly increased and then decreased,reaching the peak when the slope was 15°-25°.(3)The landscape pattern was also optimized in Erhai Lake basin from^(2)000 tO_(2)020.

关 键 词：土壤侵蚀 景观格局 洱海流域 热点分析 

分 类 号：S157.1[农业科学—土壤学]