7Franzluebbers A J,Arshad M A.Soil microbial biomass and miner a lizable carbon of water-stable aggregates[J].Soil Science Society of America Jourual[J].1997,61:1090-1097.
8Roscoe R,Buurman P,Velthorst E J.Disruption of soil aggregates by varied amounts of ultrasonic energy in fractionation of organic matter of a clay latosiol:Carbon,nitrogen and13C distribution in particle2size fiactions[J].European Journal of Soil Science.2000.51:445-454.