WANG Yan-zai,GOU Shi-wei,ZHANG Shu-lin.Analysis of Rainfall Erosivity Trend and Abrupt Changes in Three Gorges Reservoir Area (Chongqing Section)[J].Research of Soil and Water Conservation,2012,19(03):1-6.
三峡库区(重庆段)降雨侵蚀力变化趋势及突变分析
- Title:
- Analysis of Rainfall Erosivity Trend and Abrupt Changes in Three Gorges Reservoir Area (Chongqing Section)
- 关键词:
- 三峡库区(重庆段); 降雨侵蚀力; Mann-Kendall非参数检验方法
- Keywords:
- Three Gorges Reservoir Area (Chongqing section); rainfall erosivity; non-parametric Mann-Kendall statistical test
- 分类号:
- S157
- 摘要:
- 三峡库区水土流失是社会关注的焦点问题，采用Mann-Kendall非参数检验法对三峡库区（重庆段）1955-2010年降雨侵蚀力变化趋势及突变进行分析，获取56 a来研究区降雨侵蚀力时间变化特征。结果表明：（1）1955-2010年，研究区年降雨侵蚀力增大趋势不显著（sig=0.05）。季节降雨侵蚀力变化上，仅夏季降雨侵蚀力显著增大，需加强夏季水土流失治理。（2）1955-2010年，研究区年降雨侵蚀力突变开始于1967年，在1980s-1990s显著增大（sig=0.05）。季节降雨侵蚀力突变结果表明，春、秋季降雨侵蚀力突变开始于1950s末，1970s-1980s显著增大（sig=0.05）；夏季降雨侵蚀力突变开始于1979年，在2000年后显著增大（sig=0.05），近10 a来夏季降雨侵蚀潜能明显增强。（3）沿长江干流的各气象站点中，仅涪陵站年降雨侵蚀力增大显著（sig=0.1）。奉节、万县两站春、秋季节降雨侵蚀力变化趋势与沙坪坝、涪陵两站存在差异；奉节站季节降雨侵蚀力突变与其他3个站点差别较大，地形是影响研究区降雨侵蚀变化空间分异的重要因素，需加强奉节、万县的水土流失防治工作。
- Abstract:
- This paper used the non-parametric Mann-Kendall statistical test to deal with the analysis of rainfall erosivity trend and abrupt change (1955-2010) in Three Gorges Reservoir area (Chongqing section). The results summarized as: (1) from 1955 to 2010, annual rainfall erosivity in the study area did not change significantly, compared to 1975-1994, there was little change in annual rainfall erosivity potential of 1994-2010, but summer rainfall erosivity increased significantly, we should pay attention to strengthening soil erosion control in the summer; (2) the abrupt change of annual rainfall erosivity mostly started in 1967, and the abrupt change of spring and fall rainfall erosivity started in the end of 1950s; (3) compared to the rainfall erosivity trend, there was different between Fengjie,Wanxian station and Fuling, Shapingba station, but compared to the rainfall erosivity abrupt changes, there was difference between Fengjie station and other three stations.
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备注/Memo
收稿日期:2011-10-8;改回日期:2011-11-14。
基金项目:重庆市教委科技项目（KJ110608）；重庆师范大学校级青年基金项目（10XLQ02）
作者简介:汪言在（1983- ），男，山东济宁人，博士，讲师，研究方向：水土流失。E-mail：wyz2003qu@gmail.com
通讯作者:王玉宽（1963- ），男，内蒙古人，研究员，博士生导师，主要从事土壤侵蚀、流域生态研究。E-mail：wangyukuan@imde.ac.cn