闽西北地区降雨侵蚀力的时空分布特征  

A study on temporal and spatial characteristics of rainfall erosivity in Northwest of Fujian

作　　者：翟少华[1] 查轩[1] 黄少燕[1] 

机构地区：[1]福建省亚热带资源与环境重点实验室/福建师范大学地理研究所,福建福州350007

出　　处：《南昌工程学院学报》2014年第4期44-48,共5页Journal of Nanchang Institute of Technology

基　　金：国家科技支撑计划项目(2014BAD15B02);国家重点基础研究发展计划(973计划)项目(2007CB407207)

摘　　要：利用闽西北地区1980—2009年17个雨量站的逐日降雨数据,计算降雨侵蚀力R值,研究该区域内降雨侵蚀力的时空分布特征.结果表明闽西北地区降雨侵蚀力年内分布集中于5-8月份,呈现双峰式分布;降雨侵蚀力年际间变化幅度较大,2003年年降雨侵蚀力低至215.43(MJ·mm)/(hm2·h),2006年高达930.76(MJ·mm)/(hm2·h),极值比为4.32;30 a内的闽西北地区的降雨侵蚀力并未出现明显的突变现象;研究区内降雨侵蚀力R值空间分布不均匀,高大山脉地区的R值明显高于其他地区.This paper makes use of the data collected from 17 rainfall stations in the northwest of Fujian between 1980 and 2008 to analyze the temporal and spatial characteristics of rainfall erosivity. The results show that rainfall erosivity in this area is mainly found between May and August,showing a bimodal distri-bution. Inter-annual rainfall erosivity varies dramatically. The largest and smallest R values are 930. 76 （MJ＆#183;mm）/（hm2 ＆#183;h）in 2006 and 215. 43（MJ＆#183;mm）/（hm2 ＆#183;h）in 2003 respectively,making an extreme ratio of 4. 32. The rainfall erosivity in these 30 years does not show significant mutations but only an uneven spatial distribution,with the figure from high mountains saliently higher than those from others.

关 键 词：闽西北地区 降雨侵蚀力 M-K突变检验 变异系数 

分 类 号：S157[农业科学—土壤学]