8Schnitzer M. Soil organic matter - the next 75 years[J]. Soil Sci, 1991, (151): 41-58.
9Doran J W, M Safley. Defining and assessing soil health and sustainable productivity [ M ] . Biological Indicators of Soil Health. ( Eds C.E.Pankhurst, B.M.Doube, and V.V.S.R.Gupta. ) .New York: CAB International, 1997.
10Baldock J A, J O Skjemstad. Soil organic carbon/soil organic matter [M] .Soil Analysis: an Interpretation Manual. (Eds K.I.Peverill, L.A.Sparrow, and D.J.Reuter. ) .Collingwood: CSIRO Publishing, 1999.
