论文部分内容阅读
基于南方地区9个省份41个气象站点1956~2015年共60 a逐日降雨量资料,采用线性回归、Kriging插值等方法分析了南方地区降雨量和降雨侵蚀力的时空变化特征。结果表明:南方地区降雨以侵蚀性降雨为主,且比较集中,区域强降雨事件出现的频次在增加。南方地区年均降雨侵蚀力变化范围在3 477.30~24 878.65 MJ·mm/(hm~2·h·a)之间,平均值为9 919.93 MJ·mm/(hm~2·h·a),总体由南往北逐渐减少的分布规律。在季节分布上降雨侵蚀力主要集中在夏季。60 a来南方大部分地区年降雨侵蚀力均呈上升趋势,其中海南、浙江、江西3省上升趋势较为明显,说明这些地区面临较大的土壤侵蚀潜在压力。
Based on the daily rainfall data of 41 meteorological stations in 19 provinces in 9 provinces in the southern region from 1956 to 2015, the temporal and spatial variations of rainfall and rainfall erosivity in southern China were analyzed by linear regression and Kriging interpolation. The results show that the rainfall in southern China is dominated by erosive rainfall and concentrated, and the frequency of heavy rain events in the region is increasing. The average annual rainfall erosivity varied from 3 477.30 to 24 878.65 MJ · mm / (hm ~ 2 · h · a) in the southern region with an average of 9 919.93 MJ · mm / (hm -2 · h · a) The overall distribution from south to north gradually decreased. In the seasonal distribution of rainfall erosions mainly in the summer. Over the past 60 years, the annual rainfall erosivity has been on the rise in most parts of South China. Among them, the upward trend in Hainan, Zhejiang and Jiangxi provinces is more obvious, indicating that these areas are facing greater potential for soil erosion.