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通过对福建省南平市溪后安曹下取代阔叶林的70a生杉木车产林（山坡）、32a生杉木“青年林”（山坡）及前茬阔叶林（山脊）土壤生物学活性连续2a的比较研究结果表明，与山脊上前茬的阔叶林相比，70a生杉木丰产林土壤微生物总数、生理类群的数量减少、活性下降；土壤酶活性减弱；呼吸作用强度（内源）及添加基质的外源呼吸作用强度降低，土壤中有机质分解和腐殖质再合成程度降低．32a生杉木“青年林”土壤生物学活性下降则更为明显，说明从杉木取代阔叶林（头耕土）起，土壤生化活性及土壤肥力就存在明显下降现象，轮伐期缩短或林地连栽杉木代数增加，而不采取恢复地力措施，杉木林地地力衰退将更为明显．
The soil biological activity of 70a Chinese fir plantation forest (hillside), 32a Chinese fir forest (hillside) and fore-crop broadleaf forest (ridge) of Ancaoxia, Nanping City, Fujian Province, The results of comparative study 2a showed that the total number of soil microorganisms and the number of physiological groups in 70-year-old Chinese fir plantation decreased, the activity decreased, the soil enzyme activity decreased, the respiration intensity (endogenous) and the added The intensity of exogenous respiration of matrix decreased, and the degree of organic matter decomposition and humus re-synthesis in soil decreased. The decrease of soil biological activity in the “young forest” of Chinese fir (Cunninghamia lanceolata) shows that the soil biochemical activity and soil fertility decline obviously from replaced with broadleaf forest (Cultivated head soil) Fir algebra increased, without taking measures to restore fertility, Cunninghamia lanceolata woodland recession will be more obvious.