人类活动影响下三峡库区土壤侵蚀的空间分异--以奉节县为例
首发时间:2018-12-19
摘要:三峡库区土壤侵蚀一直是水土保持研究的焦点,但关于人类活动对土壤侵蚀的影响研究较少。本文以奉节县为例,基于RULSE模型,考虑人类活动影响下植被变化趋势,结合GIS空间分析、多元回归分析和残差分析等方法,探索三峡库区人类活动对土壤侵蚀的影响。结果表明:(1)现状土壤侵蚀以轻度为主,具有以长江干流为界,沿南北方向侵蚀程度变轻的分布趋势。而在模拟状态下,土壤侵蚀以中度为主,具有由东北向西南土壤侵蚀程度逐渐变重的分布趋势,且无剧烈侵蚀等级存在;(2)在人类活动影响下,土壤侵蚀变化以改善为主,但加剧作用也较为明显。人类活动对土壤侵蚀呈现改善和加剧的两极化影响严重。(3)人类活动对土壤侵蚀的影响与人口密度分布具有高度一致性,长江干流、草堂河流域以及梅溪河部分区域,人口密度大,侵蚀程度强,人类活动以负向影响为主;(4)在园地、耕地和林地中人类活动正向影响突出,改善了土壤侵蚀状况;而在草地、采矿用地和裸地,人类活动以负向影响作用为主,土壤侵蚀加剧,故此针对不同用地类型,迅速开展适当的土壤侵蚀防治工作迫在眉睫。
关键词: 水土保持 人类活动 RUSLE 空间分布 土地利用类型
For information in English, please click here
Spatial variation of soil erosion under the influence of human activities in the three Gorges Reservoir area: a case study of Fengjie county
Abstract:Soil erosion in the three Gorges Reservoir area has been the topic of soil and water conservation research. However, rare research focused on the impact of human activities on soil erosion. This paper explores the impact of human activities on soil erosion in the three Gorges Reservoir area based on RULSE model, combined with GIS spatial analysis, multivariate regression analysis and residual analysis.The results are as following: (1) RSE is mainly mild. The soil erosion degree gradually become lighter along the north-south direction taking the Yangtze River as the boundary. But MSE is mainly moderate.The distribution trend of increasing soil erosion from northeast to southwest, and there is no violent soil erosion grade.(2)Soil erosion changes is mainly improvement under the influence of human activities, but the aggravation effect is also obvious. And the effects of human activities on soil erosion are highly consistent with the distribution of population density. the population density is more high, the erosion degree is more strong, the human activity is mainly negative influence. (3)The positive influence of human activity is prominent in garden land, cultivated land and forest land, which improves the soil erosion situation.while the negative effects of human activities is main in the grassland, mining land and bare land, which aggravates the soil erosion situation. Therefore, it is urgent to carry out appropriate works soil and water conservation according to different land types.
Keywords: conservation of water and soil human activities RUSLE spatial distribution land use types
引用
No.****
动态公开评议
共计0人参与
勘误表
人类活动影响下三峡库区土壤侵蚀的空间分异--以奉节县为例
评论
全部评论0/1000