检索结果-南通市图书馆

A STUDY ON field water CIRCULATION PATTERN IN THE DRYLAND OF NORTHERN CHINA

Journal of Geographical Sciences 1997年第4期7卷 36-43页

作者： Zhong Zhaozhan Zhao Jubao Institute of Agrometeorology, Chinese Academy of Agricultural Sciences Beijing 100081 People’s Republic of China

Based on the observed data of soil moisture from locating experiments from 1986 to 1990, the pattern of field water circulation in dryland of northern China, where the mean annual precipitation is 300 600 mm, is studied in this paper using the method of water balance. The results show that water satisfying ratio of spring seeding crops is 83.7 90.8 percent and that of winter wheat is about 70 percent in these areas; about 80 90 percent of water consumption of spring seeding crops and about 60 70 percent of water consumption of winter wheat comes from precipitation during the growing period, the rest comes from the soil water storage before the seeding period. But the available soil water is not used thoroughly, about 30 70 percent of available soil water remains unused when the crops are harvested. At the fallow period, the amount of soil water lost by evaporation is very important, which takes up 57 68 percent of precipitation in winter wheat field and 73 244 percent in field of spring seeding crops. Thus restraining soil evaporation, raising the storage ratio of natural precipitation and the soil water utilization efficiency of crops, strengthening the circulation ability of soil water by adopting efficient measures of agricultural techniques, are the main ways for exploiting and developing the potential productivity of natural precipitation in these areas.

关键词： crop field water soil evaporation crop water consumption field water circulation dryland

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