Effects of Vermicompost on Active Organic Carbon and Microbial Activity in Cowpea Soil
In order to explore effect of vermicompost application on active organic carbon and microbial activity of cowpea soil,a field experiment was conducted including four treatments,i.e.CK (neither urea nor vermicompost was applied),CF (100％ of nitrogen was provided by urea),VC (100％ of nitrogen was provided by vermicompost),and VC + CF (50％ and 50％ of nitrogen was provided by vermicompost and urea,respectively) to determine the effects of different treatments on active organic carbon,carbon pool management index (CPMI),microbial biomass carbon,microbial biomass nitrogen as well as microbial respiration and metabolic quotient in the soil of cowpea.Results indicated that in comparison with CF treatment,vermicompost application significantly increased the contents of active organic carbon,mid-active organic carbon and highly active organic carbon.The active organic carbon content and CPMI in VC + CF treatment were obviously higher than other treatments,showing 30.38％ and 36.69 increases compared with CF treatment,respectively.Meantime,the VC + CF treatment significantly increased the contents of microbial biomass carbon and microbial biomass nitrogen.Additionally,the microbial respiration was evidently enhanced by the use of VC + CF treatment,while the metabolic quotient was decreased,indicative of 64.91％,36.23％ and 16.05％ increases in microbial respiration over the treatments of CK,CF and VC,respectively.And the metabolic quotient was reduced by 10.85％,9.06％ and 5.32％,respectively.However,in VC treatment,less effect on micro-domain environment characteristics was observed than that in VC + CF treatment.Correlation analysis revealed that the correlation among different degree of soil active organic carbon,carbon pool management index and microbial activity reached significant or extremely significant level,showing close inner link among every indicator.As a result,vermicompost co-applied with inorganic fertilizer can significantly increase the active organic carbon content and enhance the microbial activity of cowpea soil.This study provides the theoretical basis for the rational fertilization of cowpea.
cowpeavermicompostactive organic carboncarbon pool management indexsoil microbial respirationmetabolic quotient
国家科技期刊平台
NSTL
万方数据
维普
