青海湟水河流域不同退耕还林模式水文效应

摘要

基于野外采样、定点观测和室内实验，研究青海湟水河流域不同退耕还林模式水文效应，结果表明：不同林分类型枯落物有效持水性大小顺序为云杉桦树混交〉桦树〉云杉〉沙棘，其林下土壤持水性大小顺序为云杉桦树混交〉沙棘〉桦树〉云杉〉农田；森林土壤是森林生态系统水文效应的主体，枯落物和土壤总持水性大小顺序为云杉桦树混交〉沙棘〉桦树〉云杉〉农田。不同林分类型枯落物持水量决定于枯落物蓄积量和自然含水率，其林下土壤持水量决定于土壤非毛细管孔隙度。%Based on field investigation conversion program models in Huangsh and experimental data, hydrological effects from different sloping land ui river watershed of Qinghai province were studied, the results showed that ： the descend order of different forest litter＇ s water holding capacity was as flows, mixture of picea crassifolia and birch, birch, pieea crassifolia, hippophae rhanmoides ; the descend order of different forest soil＇ s was as flows, mixture of picea crassifolia and birch, hippophae rhamnoides, birch, picea crassifolia, farmland ; forest soil was the principal part of forest ecosystem hydrological effects ;the descend order of forest litter and soilg to- tal water holding capacity was as flows, mixture of picea crassifolia and birch, hippophae rhamnoides, birch, picea crassifolia, farmland. Litter storage and its natural moisture content were the main reason of water holding capacity, non-capillary porosity of soil was the main reason of forest water holding capacity.