甘肃不同强度降水日数变化对干旱灾害的影响  

Impact of the variation of different intensity precipitation days on arid disaster in Gansu Province

作　　者：刘德祥[1] 白虎志[1] 梁东升 宁惠芳[1] 

机构地区：[1]中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [2]兰州区域气候中心,甘肃兰州730020

出　　处：《干旱地区农业研究》2007年第2期212-217,共6页Agricultural Research in the Arid Areas

基　　金：科技部科研院所社会公益研究专项"西北农作物对气候变化的响应及其评价方法"(2005DIB3J100);"中国干旱气象灾害监测预警方法研究"(2004DIB5J192)

摘　　要：采用甘肃省60个地面气象站1961～2004年3～10月日降水量,统计了历年3～10月的降水量,小雨、中雨、大雨、暴雨日数和连阴雨次数;用相关分析方法研究了干旱气象灾害对不同强度降水日数变化的响应。结果表明,降雨量即小雨、中雨、大雨、暴雨日数和连阴雨次数都呈减少趋势;干旱面积和粮食减产量呈增加趋势;降水量、连阴雨次数、中雨日数与干旱面积和粮食减产量之间呈显著负相关,小雨和大雨次之;连阴雨次数和中雨日数减少,是造成干旱面积扩大、粮食大幅度减产的重要因素。Based on the precipitation data of 60 meteorological stations between March -- October in Gansu Province from 1961 to 2004, rainfall and days of light rain, moderate rain, heavy rain, torrent rain and times of successive rain days in March -- October were calculated, and response of arid meteorological disaster to variation of different intensity precipitation days were analyzed. The results are as follows： there has been a decrease in rainfall, days of light rain, moderate rain, heavy rain and torrent rain, and times of successive rain, while the drought area and the grain reduction have increased; rainfall and moderate rain days and times of successive rain have a much closer negative correlation with drought area and grain reduction than light rain and heavy rain do. Decreases of successive rain times and moderate rain days are important factors that enlarged the drought area and resulted in a considerable decrease in grain production.

关 键 词：降水强度 干旱灾害 粮食产量 甘肃省 

分 类 号：P468.024[天文地球—大气科学及气象学]