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中文摘要: 用1950～2000年我国629个站逐月降水资料，采用Z指数作为旱涝等级划分标准，把各地的旱涝情况划分成7个等级，把长江以北主要农业区格点化后，以各格点中达到干旱站点的多少为权重，求出格点中干旱发生的面积。通过对51年的资料分析，发现我国北方区干旱面积在不同月份有其不同的变化特征。其中1、2、4、7、8、9、11、12月八个月的干旱面积有不断扩大的趋势，3、5、10三个月的干旱面积处于平均状态，6月份的干旱面积有减少的趋势。
中文关键词: 干旱，Z指数，时间变化
Abstract:Based on the monthly rainfall data of 629 stations from 1950 to 2000, using Z index as the standard division of the drought/wetness of seven classes (grades) are made. After squaring mainly agricultural areas in the north of the Changjiang River, the square measure of drought has happened by calculating how much proportion the drought station held each square. The results indicated that the drought areas with constantly extensive tendency are in Jan., Feb., Apr., Jul., Aug., Sep., Nov. and Dec. but declined in June.
keywords: drought,wetness,Zindex
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引用文本：
王志伟,刘文平,王红霞,2005.我国北方干旱逐月变化特征分析[J].气象,31(1):37-40.
,2005.Analysis of Monthly changes of Drought/Wetness in the Northern of China[J].Meteor Mon,31(1):37-40.
王志伟,刘文平,王红霞,2005.我国北方干旱逐月变化特征分析[J].气象,31(1):37-40.
,2005.Analysis of Monthly changes of Drought/Wetness in the Northern of China[J].Meteor Mon,31(1):37-40.