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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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三峡库区重庆段水土流失的时空格局特征
DOI: 10.11821/xb200805006, PP. 502-513
Keywords: 水土流失,重庆市,三峡库区
Abstract:
在TM解译的三峡库区重庆段1999年和2004年水土流失数据及相关辅助数据的支持下,借助GIS技术,分析了研究区5年来水土流失的时空演变及地理空间分异特征与规律。研究结果表明(1)研究区水土流失总体呈现好转趋势,极强度和剧烈水土流失面积下降变幅最大。(2)水土流失主要分布在紫色土、黄壤、石灰(岩)土、水稻土和黄棕壤分布区。(3)水土流失主要发生在受人类活动影响最为剧烈的旱坡地和疏林地。(4)水土流失表现出明显的垂直分异特征,主要集中于高程200~1500m的低山、丘陵地区。(5)水土流失与坡度具有很好的相关性,主要分布在15o以上的陡坡地。(6)水土流失与坡向分异无明显的相关关系。各坡向水土流失面积和强度分布基本相当。(7)水土流失主要集中在300~320和320~340j.cm/hm2.h的降雨侵蚀力(R)值分布区。剧烈水土流失与高降雨侵蚀力具有较好的对应关系。
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