7Ghosal M.An evaluation of aromatic fraction of humic substances.Soil Science Am J,1985,49(3) :616 -618
8鲁如坤.土壤农业化学分析方法[M].北京：中国农业科技出版社,1999..
9Embacher A, Zsolnay A, Gattinger A, et al. The dynamics of wa- ter extractable organic matter (WEOM) in common arable top- soils: Ⅱ. Influence of mineral and combined mineral and manure fertilization in a Haplic Chernozem[ J]. Geoderma,2008 ,148 :63- 69.
10McBride M B, Richards B K, Steenhuis T, et al. Mobility and solubility of toxic metals and nutrients in soil fifteen years after sludge application[ J]. Soil Science, 1997,162(7 ) :487-500.
