7Wandde, M, Yang, X. Influence of tillage on the dynamics of loose and occluded particulate and humified organic matter fractions [J]. Soil Biol. Biochem. 2000, (32) : 1151 -1160.
8Edmeades D C. The long - term effects of manures and fertilizers on soil productivity and quality: A review [ J]. Nutrient Cycling in Agroecosystems, 2003, 66: 165- 180.
9Shibahara F, Inubushi K. Effects of organic matter application on microbial biomass and available nutrients in various types of paddy soils [J]. Soil Sci. Plant Nutr., 1997, 43:191 -203.