5Jenkinson D S,Ladd J N.Microbial biomass in soil:measure-ment and turnover[J].Soil Biochemistry,1981(5):415-471.
6Smith J L,Paul E A.The significance of soil microbial biomassestimation[J].Soil Biochemistry,1990(6):357-384.
7McGrath D A,Smith C K,Gholz H L,et al.Effects of land usechange on soil nutrient dynamics in Amazonia[J].Ecosystems,2001,4(7):625-645.
8Vance E D,Brookes P C,Jenkinson D S.An extraction methodfor measuring soil microbial biomass[J].Soil Biol Biochem,1987,19:703-707.
9Sparling G P.Ratio of microbial biomass carbon to soil organiccarbon as a sensitive indicator of changes in soil organic matter[J].Australian Journal of Soil Research,1992,30:195-207.
10Gregoric H E,Carter M R,Angers D A,et al.Towards a mini-mum data set to assess soil organic matter quality in agriculturalsoils[J].Canadian Journal of Soil Science,1994,74:367-385.
