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对石灰岩及片麻岩山地不同密度4年生山合欢水土保持试验林分的生长、生物量及水文效应进行了研究，讨论了适宜造林密度。结果表明：山合欢是石质山地较好的水土保持树种，适宜的造林密度应在3333株／hm2以上。其幼林生物量及水文效应特征值都以片麻岩山地大于石灰岩山地林分。
The growth, biomass and hydrological effects of soil and water conservation trials of four-year-old Alnus cremastogyne forests with different densities in limestone and gneiss were studied, and the appropriate afforestation density was discussed. The results showed that: Acacia is a better soil and water conservation tree stony mountain species, the appropriate planting density should be more than 3333 plants / hm2. The characteristics of young forest biomass and hydrological effects were all higher in the gneissic mountainous area than in the limestone mountainous area.