5XURenkou(徐仁扣),儿Guoliang(季国亮),JIANGXin(蒋新).Effect of low molecular weight organic acids on aluminum release from kaolinite [J]. Acta Pedologica Sinica ,2002,39(3): 334-340(in Chinese with English abstract).
7Schnitzer M.Some observation on the chemistry of humic substances [J].Agrochimica,1978,22:216-225.
8Flaig W.土壤有机质对土壤肥力的重要性[J].国外农业科技,1979(9):22-26.
9Kalembas S J,Jenkinson D S.Comparative study of titrimetric and gravimetric methods for determination of organic carbon in soil[J].The Science of Food and Agriculture,1973,24(9):1085-1090.
10Stevenson F.Organi cacidsin soil[J].Soil Bio Chem,1967(1):119-146.