Eco- Environmental Water Demand Research on Forestland in the Central and Southern Ningxia

摘要

Basing on meteorological data，vegetation distribution data，water resources condition data and so on as the background material，we calculated the minimum and appropriate eco-environment water requirement of existing forest in the central and southern Ningxia in growing season. Through the equilibrium analysis between the attrition eco-environment water demand and rainfall resource，the results show that Longde and Jingyuan county which locate in the southern，with an average rainfall of 350 ～ 550 mm, the minimum and appropriate eco-environment water demand both can be meet relying on precipitation, and the vegetation growth in good condition. Pengyang and Yuanzhou county which locate in the southern，with an average annually rainfall of 350 mm or so, the minimum eco-environment water demand can be satisfied, but appropriate eco-environment water demand can not be satisfied. So reasonable forest planting structure should be considered in the area. Haiyuan, Yanchi and Tongxin county in the central arid area and Xiji in the south，with an average annually rainfall between 175 and 280， both minimum and appropriate eco-environment water demand can not be satisfied，it is unfavorable to develop forest in this area.