Influence of litter importation on basal respiration and labile carbon in restored farmland in Sanjiang Plain
凋落物输入对三江平原弃耕农田土壤基础呼吸和活性碳组分的影响

The accumulation of soil organic carbon is determined by the net balance between soil organic matter importation and exportation. The vegetation restoration and litter importation are prerequisite factors, which could determine the nutrition restoration in soil, but the litter importation often been considered the fundermental factor determining the process of soil restoration. In this paper, we studied the reaction of soil basal respiration, microbial biomass carbon (MBC) and dissolved organic carbon (DOC) after organic litter importation. Under the condition of same litter importation, the decomposition rate of litter biomass showed the opposite tendency as the content of total organic matter in soil. The different kinds of litter imporation could influce the basal respiration, MBC and DOC in soil, which could also determine the ability of soil microbial decomposition. Our results indicated that the litter decomposition rate from easier to harder in Sanjiang Plain was: plantation> Deyeuxia angustifolia and soybean>maize.