甘肃干旱半干旱地区降水特征及其对农业生产的影响

本文根据甘肃干旱半干旱地区多年降水资料分析，得出其降水资源的主要特征是：降水量少，水热光组合失调；降水变率大，易干旱也可能洪涝；降水年内分配不匀，干旱时段明显等，并较详细地评述了这些降水特征对农业生产的利弊影响，还提出了农业生产充分利用降水资源的途径。

CHARACTERISTICS OF PRECIPITATION AND THEIR EFFECTS ON AGRICULTURAL PRODUCTION IN GANSU ARID AND SEMI ARID ZONE

Based on the data of precipitaton in Gansu arid and semi arid zone,main characteris-tics of precipitation have been analysed,the results show as follows:1.the annual precipita-tion is scarce,and the combination of water heat light is out of order;2.the variabil-ty of precipitation is remarkable,which is easy to cauce either drought or flood;3.thedistribution of the annual precipitation is unmean,and the dry duration is obvious. Finally,the effects of the characteristics of precipitation on agricultural production are assessed indetail,and the measures for making full use of rainfall resources to promote agriculturalare suggested.