东北地区作物生长季降水异常特征分析

Analysis of Rainfall Anomaly in Growing Season of Crops in Northeast China

摘要:

采用东北地区52个测站1951-2000年4-9月降水量资料，对东北地区作物生长季降水异常进行了诊断分析。结果表明：东北地区生长季降水存在减少趋势，旱灾略多于涝灾，主要存在3-7、12和30a左右的周期变化；可划分为7个降水异常区，其中相邻的3个区（东北中部、南部和东部的大范围地区）有变旱倾向，辽西地区的旱涝灾害最频繁。根据降水减少的趋势，提倡发展旱作农业和节水农业。

Abstract:

The precipitation departure in the growing season (April to September) of crops over Northeast China was analyzed with the rainfall data of 52 stations from 1951 to 2000 over Northeast China. The results show that there was a decreasing trend generally in precipitation with the periods being about 3-7, 12 and 30 years, with drought years more than flooding years in the past 50 years. According to the rainfall anomaly in growing season, Northeast China can be divided into several abnormal areas: a dry trend the middle, southern and eastern parts; and relatively frequent floods/droughts in the western. Considering the decreasing precipitation, it is suggested to adopt dry-farming and water-saving agriculture.