1Angers D A,Dayegamiy N,Cote D.Tillage induced differences in organic matter of particle-size fractions and microbial biomass[J].Soil Science Society of America Journal 1993,57(2):512-516.
2Biggelaar C,Lal R,Wiebe K,et al.The global impact of soil erosion on productivity.1:Absolute and relative erosion-induced yield losses[J].Advances in Agronomy,2004,81:1-48.
