近45年安徽省降雨侵蚀力年内分配特征的时空演变  

Spatial and Temporal Evolution of Intra-annual Distribution of Rainfall Erosivity in Anhui Province during Recent 45 Years

作　　者：孙莉娟 陈金华[3] 徐阳[3] 黄进 SUN Li-juan;CHEN Jin-hua;XU Yang;HUANG Jin(Anhui Weather Modification Office,Hefei 230031,China;Huaihe River Basin Meteorological Center,Hefei 230031,China;Rural Comprehensive Economic Information Center of Anhui Province/Anhui Agrometeorological Center,Hefei 230031,China;School of Applied Meteorology,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]安徽省人工影响天气办公室,安徽合肥230031 [2]淮河流域气象中心,安徽合肥230031 [3]安徽省农村综合经济信息中心/安徽省农业气象中心,安徽合肥230031 [4]南京信息工程大学应用气象学院,江苏南京210044

出　　处：《江西农业学报》2020年第3期112-117,共6页Acta Agriculturae Jiangxi

基　　金：淮河流域气象开放研究基金资助项目(HRM201802);国家重点研发计划项目(2018YFD0300905);安徽省新技术集成项目(AHXJ201706)。

摘　　要：依托77个气象站点1973~2017年的逐日降水资料,将降雨侵蚀力与降水集中性指数有机结合,全面探讨了安徽省降雨侵蚀力年内分配特征的时空变化。主要结果如下:(1)安徽省年降雨侵蚀力由南向北逐步降低,而降雨侵蚀力集中性指数(RECI)的高值区域主要集中西北部和最南部;(2)大部分地区的降雨侵蚀力主要集中在3~4个月内,其中7月份的贡献率最高;(3)基于主成分分析,安徽省可以划分为中南部、最南部、中北部、西南部、东北角这5个呈现不同RECI变化情形的子区域,并且各子区域的RECI均呈现出主周期为2.5~3.5 a的年际振荡;(4)1973~2017年间全省大部分地区降雨侵蚀力的年内分配不均匀性呈现加剧态势,特别是2000年后的上升态势尤为显著。Based on the daily precipitation data at 77 meteorological stations,the rainfall erosivity and precipitation concentration index were combined in this study,and the spatial and temporal variations of intra-annual distribution of rainfall erosivity in Anhui were discussed comprehensively.The main results were as follows:(1)the annual rainfall erosivity in Anhui province were gradually decreasing from south to north,while the high values of rainfall erosivity concentration index(RECI)were mainly concentrated in the northwest and southernmost area;(2)the rainfall erosivity in most areas was mainly concentrated in 3~4 months,and July had the highest contribution rate;(3)by using PCA,Anhui could be divided into five sub-regions with different temporal variations in RECI as south-central area,southmost area,north-central area,southwest area,northwest corner,and the RECI in each sub-region exhibited inter-annual oscillations with the main period of 2.5~3.5 years;(4)during 1973~2017,the heterogeneity of intra-annual distribution of rainfall erosivity in most of Anhui were aggravating,especially after 2000.

关 键 词：安徽省 降雨侵蚀力 年内分配 主成分分析 

分 类 号：P426[天文地球—大气科学及气象学]