天台山不同林型土壤微生物区系及其商值(qMB,qCO2)

研究了天台山8种林型下土壤微生物数量、微生物量碳、微生物量氮、微呼吸速率和微生物商值(qMB，qCO2)，结果表明，均以云锦杜鹃林、黄山松林、茶园和竹林土壤中较大，以柳杉林土壤最小。天然林土壤的上述指标的平均水平均高于人工林土壤，所产生的差异是不同林型的立地条件和土壤性状综合影响的结果qCO2值以柳杉林、日本花柏林和茶园土壤最高(4．52％，4．43％，4．26％)，云锦杜鹃林、黄山松林和七子花林土壤相对较低(3．475％，3．82％，3．70％)，比前者土壤质量较好，可持续利用潜力大。

Microflora and microbial quotient (qMB, qCO2) values of soils in different forest types on Tiantai Mountain in Zhejiang

The soil microbial quotient (qMB,qCO\-2) values,number,biomass C,biomass N,and respiration rate were preliminarily analyzed.The results indicated that these items were higher in Rhododendron fortunei forest soil, Pinus taiwanersis forest soil,tea plantation soil,and bamboo forest forest soil,compared to other 5 types of forest soils. That of soil microorganism was the lowest in Cryptomeria fortunei forest soil.The mean value of microbial indices was higher in the natural woods soils than that of the artificial woods soils.The soil locality condition and soil characteritics showed synthesis effect on the difference of the microbial indices from 8 forest soils.The qCO 2 values were higher(4 52%,4 43%,4 265) in C. fortunei forest soil, Chamaecyparis pisifera forest soil,tea planation soil,and bamboo forest soil than in to other soils. The qCO 2 values were lower (3 475%,3 82%,3 70%) in R. fortunei forest soil, Pinus taiwanersis forest soil and Heptacodium miconioides forest soil whose quality were better,and the potentiat for sustainable use of soils was higher.The qCO\-2 value not only acted as a harmonious coefficient between the microbial respiration rate and microbial biomass, but also had an ecological importance for reflecting the soil characteristics and the sustainable use of soils.