通过选择邻近分布，母岩一致，树龄相近且为近成熟林等可比性较强的一代、二代、三代杉木林标准地，研究杂木林及不同栽杉代数杉木林土壤水分物理性质、土壤养分和腐殖质及土壤生化活性的差异，并采用主成分分析（PCA）法对不同林分类型土壤肥力进行排序。结果显示：表层土壤（0～20 cm）肥力以杂木林最高，其次为一代杉木林的，二代和三代杉木林的则最差；底层土壤(20～40 cm)肥力以杂木林最高，一代、二代和三代杉木林的均较差。建议降低人为干扰频率和强度及改善林分群落结构来提高杉木人工林土壤肥力，从而实现杉木林的可持续经营。%Through selecting strong comparative plots with close location, same native rock and similar tree age in Chinese fir plantation of the first, the second and the third planting, the soil hydrophysical properties, nutrition, humus and biochemical activities were further studied, and soil fertility was classified by PCA method under broadleaved forest and Chinese fir plantation of different continuously planting. The results indicated that, among the soil fertility at topsoil in different stands, broadleaved forest occupied first place, the first planting Chinese fir come second, and the second and third planting Chinese fir were relatively poor; that among soil fertility at subsoil, broadleaved forest was quite well, and Chinese fir plantation of the first, the second, the third planting were relatively poor; and that the key to improve soil fertility in man-made forest and attain sustainable management of forest land is to decrease the frequency and intensity of artificial disturbance , and to ameliorate the community structure of Chinese fir plantation.
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