水土保持学报2025，Vol.39Issue(6)：94-105,12.DOI:10.13870/j.cnki.stbcxb.2025.06.037
三峡库区生态屏障区土壤侵蚀时空变化特征与驱动因素
Spatiotemporal Variation Characteristics and Driving Factors of Soil Erosion in Ecological Barrier Zone of Three Gorges Reservoir Area
摘要
Abstract
[Objective]Investigating the spatiotemporal variation characteristics of soil erosion and its driving factors in the ecological barrier zone of the Three Gorges Reservoir area is beneficial to enhancing regional soil and water conservation capacity and strengthening the ecological security barriers.[Methods]The RUSLE model was employed,combined with Sen+MK trend analysis,Hurst index analysis,and PLUS model,to study the spatiotemporal variation characteristics of soil erosion from 2000 to 2023 and the future soil erosion patterns in the ecological barrier zone of the Three Gorges Reservoir area.In addition,the random forest model was used to quantify the influence of vegetation cover,rainfall,population density,and other factors on soil erosion.[Results]1)Soil erosion in the ecological barrier zone was predominantly slight(59.68%±5.59%)and mild erosion(38.86±4.64%),exhibiting a spatial pattern of higher in the central part and lower in the east and west,with the most severe soil erosion occurring near water systems.2)The annual average soil erosion modulus per unit area in the ecological barrier zone decreased by 2 288.88 t/(km2·a)from 2000 to 2023,demonstrating a significant declining trend.Although the area with slight degradation(48.00%)was the highest,future soil erosion was expected to continuously improve,with the highest proportion of slight soil erosion area under the ecological protection scenario.3)The results of random forest model showed that vegetation cover(30.64%±10.88%)and rainfall(23.43%±8.57%)were the primary driving factors of soil erosion.The relative influence of vegetation cover and population density exhibited a declining trend over time,while relative influence of rainfall first increased and then decreased.In contrast,the relative importance of slope and elevation showed an increasing trend with time.[Conclusion]The soil erosion conditions in the ecological barrier zone have significantly improved from 2000 to 2023.However,soil erosion has further intensified in urbanized areas.In the future,comprehensive soil and water conservation measures should be formulated by coordinating factors such as vegetation cover,rainfall,and topography to mitigate soil erosion.关键词
三峡库区生态屏障区/土壤侵蚀/时空特征/随机森林/驱动因素Key words
ecological barrier zone of Three Gorges Reservoir area/soil erosion/spatiotemporal characteristics/random forest/driving factors分类
农业科技引用本文复制引用
斛如媛,杨佳,赵海平,勾蒙蒙,刘常富,肖文发..三峡库区生态屏障区土壤侵蚀时空变化特征与驱动因素[J].水土保持学报,2025,39(6):94-105,12.基金项目
国家重点研发计划项目(2023YFF1305205) （2023YFF1305205）
