水土保持学报2024，Vol.38Issue(4)：132-142,11.DOI:10.13870/j.cnki.stbcxb.2024.04.033
北京市近40年来降雨侵蚀力时空变异特征
Temporal and Spatial Variations of Rainfall Erosivity in Beijing in Recent 40 Years
摘要
Abstract
[Objective]Rainfall erosivity serves as an indicator to assess the potential impact of rainfall on soil erosion,playing a crucial role in evaluating regional soil erosion risk.Therefore,analyzing the temporal and spatial variations of rainfall erosivity in Beijing from 1981 to 2020 holds significant importance for scientifically assessing and preventing regional soil erosion risks.[Methods]This study employed Kriging interpolation,Mann-Kendall non-parametric test,and wavelet analysis based on daily precipitation data collected from 119 rainfall stations in Beijing and its surrounding areas between 1981 and 2020.These methods were utilized to analyze the spatial distribution,trend changes,and periodic fluctuations of annual rainfall erosivity as well as erosivity associated with moderate rain(10～25 mm),heavy rain(25～50 mm),and extreme rain(≥50 mm)in Beijing.[Results]The annual rainfall erosivity in Beijing ranged from 1 691.51 to 3 914.89(MJ·mm)/(hm2·h·a)during the period from 1991 to 2020.The spatial distribution characteristics of annual rainfall erosivity exhibited similarities with heavy rain and rainstorm but differed from moderate rain patterns.Overall,there was a decreasing trend observed from northeast regions towards the surrounding areas.Over the past four decades,moderate rainfall erosivity demonstrated a significant increasing trend in Beijing;however,no significant mutations or trends were observed for annual rainfall erosivity,heavy rain events,rainstorms or July-August summer precipitation erosivity.Notably large decreasing trends were identified for annual rainfall erosivity within local areas such as Miyun and Pinggu districts.The main cycle for both annual rainfall erosivity and medium-to-heavy intensity precipitation lasted approximately twenty-five years with two to three alternating"low-high"changes.[Conclusion]The study can offer a scientific foundation for soil and water conservation,agricultural practices,and ecological preservation in Beijing.关键词
降雨侵蚀力/Mann-Kendall检验/小波分析/时空分布Key words
rainfall erosivity/Mann-Kendall test/wavelet analysis/temporal and spatial distribution分类
农业科技引用本文复制引用
冯笛珂,符素华,丁建新,颜婷燕,徐发军,腾润平,张大勇..北京市近40年来降雨侵蚀力时空变异特征[J].水土保持学报,2024,38(4):132-142,11.基金项目
北京市水土流失监测专项(2023SJCZJCJCZX36) （2023SJCZJCJCZX36）
国家自然科学基金项目(42130701) （42130701）
