摘要
本文应用1951—1980年降水量资料分析了黄土高原地区山西、陕西、宁夏、甘肃四省区干旱的主要气候特征,结果表明:六十年代以来黄土高原干旱形势趋于严重。春旱中的大旱频率大大增加,夏旱频率也有上升,大旱机遇增大。季节性干旱的地域分布明显。春旱主要发生在黄土高原的西部、北部和东部,中南部较少,春季大旱出现最多的是陕北与晋中。夏旱主要分布于晋南、关中、陇中及宁夏。
In this paper the climatogical dasa during 1951—1980 are use to ana Iyse the major ary climatological characteristics in Shaanxi, Ningxia and Gansu provinces on the Loess plateau.The statistical analysis indicated that drought situations have shown a serious tendency to be dry on the Loess plateau since 1960s.The frequency of dig droughts in spring droughts increases gradually, and that of summer droughts shows a rising tendency.Regional distribution of seasonal drought is also apparent Spring droughts occur mainly in the west, north and east parts of the loess plateau. The few drought oceur in the middle and south parts of the plateau.The big spring droughts mostly occur in north Shaanxi and the central Shaaxi The summer droughtschiefly distribute in North Shaanxi,Central,Shanxi,Central Gansu and Ningxia.
出处
《干旱地区农业研究》
CSCD
北大核心
1989年第2期36-43,共8页
Agricultural Research in the Arid Areas
