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采用固定标准地法,对南平溪后70年生杉木丰产林（山坡、山洼和32年“青年林”（山坡）及杉木林的前身杂木林的水源涵养功能进行了为时两年的研究,结果表明:杂木林林褥层的饱和持水量分别是杉木“青年林”和丰产林（山坡和山洼）的5.3倍、3.3倍和6.5倍,杂木林土壤层（10～40cm）饱和持水量分别比“青年林”和丰产林（山坡和山洼）高14.94％、13.81％和17.15％。杂木林林分总持水量分别比“青年林”和丰产林（山坡和山洼）高15.06％、13.73％和16.40％。杂木林表层（10～20cm）土壤初渗值和稳渗值分别是“青年林”和丰产林（山坡和山洼）的1.16倍、2.32倍和1.78倍。杉木林取代杂木林后林分水源涵养的功能下降,地上部分各水文层的持水作用随时间发生转移,表明其水源涵养功能的不稳定性。
A two-year study on the water conservation function of the 70-year-old fir plantation (hillside, hillside and 32-year-old “young forest” The results showed that the saturated water holding capacity of the mixed layer was 5.3 times, 3.3 times and 6.5 times higher than that of the “young forest” and the high yield forest (hillside and hillside) respectively. The saturated water content of the soil layer (10 ~ 40cm) The “young forest” is 14.94%, 13.81% and 17.15% higher than the high-yield forest (hillside and hilly), and the total water holding of the mixed forest is 15.06% and 13.73% higher than that of “young forest” and high yield forest 16.40%. The initial soil infiltration and soil infiltration values of the surface layer (10 ~ 20cm) were 1.16 times, 2.32 times and 1.78 times higher than that of “young forest” and high yield forest (hillside and hillside) The function of water conservation decreased, and the water holding function of each aquifer in the aboveground part shifted with time, indicating the instability of water conservation function.