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对江西大岗山山下林场杉木人工林５～１５ｃｍ土壤性质研究结果表明：土壤中细菌、放线菌、真菌数量，细菌中芽孢杆菌、放线菌中灰色菌丝群以及真菌中的曲霉和木霉数量，随林下植被盖度的增大而提高。土壤酶活性强度、腐殖质各组分Ｃ的含量，在１６和１８地位指数级样地，随林下植被盖度增大而提高，１４地位指数级相反，在１６地位指数级土壤有机质、速效Ｎ、交换性盐基总量，以及１８地位指数级土壤有机质、全Ｎ、速效Ｎ、Ｐ、Ｋ、Ｍｇ＋＋和Ｃａ＋＋含量，均随林下植被盖度的增大而提高。
The results of soil properties of 5 ~ 15cm soil of Chinese fir plantation in Dagangshan forest farm in Dagangshan, Jiangxi show that the number of bacteria, actinomycetes, fungi, Bacillus in bacteria, gray mycelium in actinomycetes and Aspergillus The number of molds increased with the increase of forest cover. The activity of soil enzymes and the contents of C in humus were increased at the 16th and 18th index sites with the increase of cover under the stands. The index of 14th position was opposite. At 16th index soil organic matter, available N , Total amount of exchangeable base and content of soil organic matter, total N, available N, P, K, Mg ++ and Ca ++ in 18 index soil increased with the increase of forest cover.