我国南方季节性干旱研究

分析了南方季节性干旱的特征、成因和抗旱体系。其特征是干旱出现的频率与强度加大，表土干旱和干热同步。成因是降水量、蒸发量年分布在时间序列上不同步；红壤调控供水力弱、有效水少和生物耗水多、供需矛盾突出。关键对策是建立开源节流为主体、降耗增效为两翼的抗旱技术体系。

Study on Seasonal Drought in Southern China.

The characteristics, causes of seasonal drought in Southern China and the combating countermeasures are discussed in the paper. The results of the study show that the characteristics of the seasonal drought are: the frequency and intensity of drought have been increasing and the surface soil drought occures simultanously with dry and hot season; the main causes of seasonal drought are: the time difference of distribution of rainfall and evaporation, the limited space of red soil for water storage, the shortage of available water and the high water demend of crops; the key combating countermeasure is: to establish a drought combating technical system which takes the water resource exploitation and water saving as principal measures and takes the reducing of water consumption and the increasing of water utilization ratio as supporting measures.