1961—2019年江西省降雨侵蚀力时空变化分析
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作者单位:

1.南京信息工程大学;2.环境保护部南京环境科学研究所

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中图分类号:

S157.1 ????????

基金项目:

生态环境部“三定”职责项目“全国生态状况遥感调查与评估”(22110499002)


Spatial-temporal variation of rainfall erosivity in Jiangxi Province from 1961 to 2019
Author:
Affiliation:

1.NUIST;2.Nanjing Institute of environmental science, Ministry of environmental protection

Fund Project:

National Ecological Status Remote Sensing Survey and Assessment project of Ministry of Ecology and Environment, No.22110499002

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    摘要:

    降雨侵蚀力(R)与降雨量、降雨历时、降雨强度、降雨动能有关,反映了降雨特性对土壤侵蚀的影响,是影响土壤侵蚀重要的因素之一。本文利用1961—2019年江西省25个气象站点的逐日降雨量数据,基于降雨侵蚀力模型,通过Mann-Kendall相关检验、小波分析和Kriging空间插值方法,分析江西省降雨侵蚀力空间分布及变化趋势。结果表明:江西省年均降雨量和降雨侵蚀力从赣南到赣北逐渐增加,同时降雨空间分布和降雨侵蚀力空间分布具有相似性;春季和夏季降雨侵蚀力在3000~6000 MJ·mm·hm-2·h-1·a-1,且春季降雨侵蚀力最大值高于夏季,而秋冬季降雨侵蚀力明显小于春夏季;江西省年降雨侵蚀力平均分布,平均最大值分布在赣北区域,其次赣中,赣南最小,侵蚀力由北向南逐渐递减。研究表明江西省因降雨产生侵蚀力不断增加,尤其以春夏季更为剧烈,其空间分布存在明显差异。

    Abstract:

    Rainfall erosivity (R) is related to rainfall amount, rainfall duration, rainfall intensity, and rainfall kinetic energy. It reflects the influence of rainfall characteristics on soil erosion and is one of the important factors affecting soil erosion. Using the daily rainfall data of 25 meteorological stations in Jiangxi Province from 1961 to 2019, based on the rainfall erosivity model, through Mann-Kendall correlation test, wavelet analysis and Kriging spatial interpolation method, the spatial distribution and variation trend of rainfall erosivity in Jiangxi Province were analyzed. The results show that the annual average rainfall and rainfall erosivity in Jiangxi Province gradually increased from southern Jiangxi to northern Jiangxi, and the spatial distribution of rainfall and rainfall erosivity were similar; the rainfall erosivity in spring and summer ranged from 3000 to 6000 MJ·mm· hm-2·h-1·a-1, and the maximum rainfall erosivity in spring is higher than that in summer, while the rainfall erosivity in autumn and winter is significantly smaller than that in spring and summer; the annual rainfall erosivity in Jiangxi Province is evenly distributed, and the average maximum value is distributed in northern Jiangxi area, followed by central Jiangxi and southern Jiangxi, and the erosive force gradually decreased from north to south. The research shows that the erosion factors caused by rainfall are increasing in Jiangxi Province, especially in spring and summer, and there are obvious differences in their spatial distribution.

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  • 收稿日期:2022-03-09
  • 最后修改日期:2022-09-10
  • 录用日期:2022-09-21
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