Effects of Carbon Source with Different Bioavailability on Vermicomposting
Traditional vermicomposting raw material formulation relies on mass ratio,volume ratio,or carbon nitroger ratio(C/N)formulation methods,which ignore the differences in bioavailable fractions of organic matter from different carbon sources and are irrational.To investigate the effects of different bioavailable carbon sources on the growth and reproduction of earthworms and carbon and nitrogen fixation of compost,this study conducted a 60 d vermicomposting experiment with a compound of cow manure(nitrogen source)and carbon source materials with low,medium and high bioavailability(pineapple peel residue,rice straw and tomato straw)at C/N 30.The results showed that the average daily increase of earthworms was up to 6.4 times.The highest humus content(15.11%)but the lowest total organic carbon fixation rate(39.63%)was found in the treatment with the easy-to-use carbon source pineapple peel residue;the highest total number of earthworms(385)and the highest total nitrogen fixation rate were found in the treatment group with the difficult-to-use carbon source tomato straw.The higher the proportion of carbon source waste with high bioavailability,the greater the earthworm weight gain;the higher the proportion of carbon source waste with low bioavailability,the higher it could promote earthworm reproduction;the total organic carbon fixation rate of earthworm manure after earthworm transformation ranged from 39.63%to 59.28%,and the total nitrogen fixation rate ranged from 65.04%to 95.59%.This study illustrated the effects of different carbon sources on earthworm production and carbon and nitrogen fixation,and provided a reference for the improvement of vermiculture and low-carbon solid waste composting process.
bioavailabilitycarbon sourceearthwormsvermicompostingcarbon and nitrogen
国家科技期刊平台
NSTL
万方数据
