Biodiversity Science ›› 1999, Vol. 07 ›› Issue (1): 1-7.doi: 10.17520/biods.1999001

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Study on soil microbes and biochemical activity in the continuous plantations of Cunninghamia lanceolata

YANG Yu-Sheng1), QIU Ren-Hui1), YU Xin-Tuo1), Huang Bao-Long2)   

  1. 1) Fujian Forestry College , Nanping , Fujian , 353001
    2) Nanjing Forestry University , Nanjing , 210037
  • Received:1998-06-18 Revised:1998-10-26 Online:1999-02-20

Soil microbes , soil enzyme activity and soil biochemical action intensity in the stands of the broadleaf forest and Cunninghamia lanceolata stand of the first , the second , the third planting were studied comparatively. The results indicated that , through the substitution of Cunninghamia lanceolata plantation ( the first planting) for broad-leaf forest and then the continuously planting Cunninghamia lanceolata , the total quantity of major soil microbes declined , of which the first rotation of Cunninghamia lanceolata was decreased by 59. 88 % in the top soil (0~20 cm) compared with that of the broadleaved forest , and that of the second and the third rotation was of 14. 68 % , 16. 51 % respectively compared with that of the first rotation. The proportion of bacteria and fungi in the amount microbes increased , while that of actinomyces decreased. The amount of major physiological group including ammonifiers , nitrogenfixing bacteria , cellulosedecomposing microbes , aerobic nitrogen fixing bacteria and anaerobic nitrogen fixing bacteria all decreased. The activity of soil enzyme weakened which include invertase , urease , proteinase , acid phosphtase , catalase and perxidase. Soil biochemical action activity impared which include ammonification , nitrification , nitrogen fixation , and decomposition of cellulose. As to the soil respiration , the release amounts of CO2-decreased , while the RQ value increased. All of which may led to the degradation of the soil fertility.

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