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本文通过对５年生杉木幼林套种三年桐模式的土壤肥力测定分析结果表明：套种林地土壤水分状况、孔隙状况和土壤结构体均较杉木纯林有所改善；０～２０ｃｍ土层渗透系数比杉木纯林增加１．９５ｍｍ／ｍｉｎ；套种模式土壤养分含量有所提高，０～２０ｃｍ土层有机质比杉木纯林增加０．６１％．这说明杉木幼林套种三年桐林分具有较强的培肥土壤和水源涵养作用．
In this paper, we analyzed the soil fertility of the three-year-old Chinese fir plantation model with three years of tung tree model. The results showed that: the soil moisture condition, the pore condition and the soil structure of the interplanted forestland were better than that of the pure Chinese fir plantation; the permeability coefficient of 0-20cm soil layer was higher than that of Chinese fir The pure forest increased by 1.95mm / min, the intercropping model soil nutrient content increased, and the organic matter in 0-20cm soil layer increased by 0.61% than the pure forest of Chinese fir. This shows that three years of interplanting fir young forest Tonglin has strong soil fertility and water conservation.