中文摘要：

文中以内蒙古赤峰市敖汉旗大五家流域内防护林为研究对象,重点研究该流域内不同防护林涵养水源功能的现状,旨在评价不同植被类型水源涵养功能的差异,同时探寻低功能涵养水源型防护林更新改造途径。研究结果表明：不同防护林的土壤理化性质以及涵养水源功能差异明显,华北落叶松白榆混交、杨树柠条混交枯落物的现存量为3.4695-4.8536 t/hm^2,最大持水量为64.225-66.125mm;华北落叶松白榆混交的植被类型具有良好的涵养水源能力,为164.563 t/hm2;灌木纯林和灌木混交林在实际调查中表现较差,在今后的森林经营中应考虑营造针阔混交林。

英文摘要：

Protective forest in Dawujia watershed of Aohan County, Chifeng city was taken as the research object to study the water conservation function of the different protective forest, evaluate the differences of water conservation function of the protective forest, and inquire about renewal transformation ways of the low water conservation function of protective forest. The result showed： there are significant differences between the soil physical properties and the water conservation function among the protective forests, the litter amount of mixed stand of Lairx principis - rupprechtii and Ulmus pumila, mixed stand of Poplars and Caragana korshinskii is 3. 4695 - 4. 8536t/hm2. The maximal litter water retention is 64.225 - 66. 125mm. The mixed stand of Lairx principis -rupprechtii and Ulmus pumila has higher water conservation fuction, which is 164. 563t/hm^2. The pure forest of shrub and the mixed forest of shrub display in the thorough investigation badly. Therefore, it was proposed that in the future the coniferous and broad-leaved mixed forest should be afforested and managed firstly.