Influence of cultivation and fertilization on total organic carbon and carbon fractions in soils fro

Abstract：To evaluate the degradation of soil quality and find ways to maintain soil fertil-ity on the Loess Plateau of China，the effects of cultivation time on total organic carbon(TOC)，light fraction of organic carbon (LFOC)，and microbial biomass carbon (MB-C) intwo soil chronosequences comprised of Huangmian (Calcaric Cambisols，FAO) and Huihe(Haplic Greyxems，FAO) soils were investigated. The effects of fertilization on the TOC andits fractions were also studied using samples from a long-term experiment on Heilu soil (Cal-cic Kastanozems，FAO). Upon cultivation，Huangmian soil (0～20 cm) lost 77% of TOCwithin 5 years，at a reduction rate of 2.15 Mg C ha-1 per year. The Huihe soil (0～20 cm)lost 70% of TOC at a rate of 0.96～1.06 Mg C ha-1 per year over 42 years. In the ......     （共24193字）    [阅读本文]>>