Although composting is a very effective way to dispose agricultural wastes,its development is greatly limited by the low compost quality and greenhouse gas emissions.At present,there is a lack of effective means to so...Although composting is a very effective way to dispose agricultural wastes,its development is greatly limited by the low compost quality and greenhouse gas emissions.At present,there is a lack of effective means to solve these two problems simultaneously.Here,the effects of three additives of compound microbial agent,biochar and biochar carried microbial agent on the composting performance,nitrogen transformation,greenhouse gas and ammonia emissions,and bacterial communities were investigated in sheep manure composting during 28 days.Results showed that biochar carried microbial agent prolonged the thermophilic stage and promoted compost maturity.At the same time,it was confirmed by the increase of the decomposition of organic nitrogen and the transformation of NH_(4)^(+)-N to NO_(3)^(−)-N.Besides,adding biochar carried microbial agent decreased CH_(4),NH_(3) and N_(2)O emissions by 65.23%,42.05%and 68.64%,respectively.The gas emissions were mainly correlated to Chloroflexi,Myxococcota,Acidobacteriota,Firmicutes,and Gemmatimonadota.Redundancy analysis showed that EC and TKN were closely related to bacterial community.Therefore,biochar carried microbial agent is recommended as an effective additive to enhance compost quality and reduce gas emissions during sheep manure composting.展开更多
基金National Key Research and Development Program of China(2018YFC1802904)National Science Foundation of China(52264013 and 41867061)+2 种基金Inner Mongolia Science&Technology Plan Program(2019 and 2020)National Science Foundation of Inner Mongolia(2020MS02005)Inner Mongolia Engineering Research Center of Evaluation and Restoration in the Mining Ecological Environment and the Special Fund for the Transformation of Scientific and Technological Achievements in Inner Mongolia(2019CG062).
文摘Although composting is a very effective way to dispose agricultural wastes,its development is greatly limited by the low compost quality and greenhouse gas emissions.At present,there is a lack of effective means to solve these two problems simultaneously.Here,the effects of three additives of compound microbial agent,biochar and biochar carried microbial agent on the composting performance,nitrogen transformation,greenhouse gas and ammonia emissions,and bacterial communities were investigated in sheep manure composting during 28 days.Results showed that biochar carried microbial agent prolonged the thermophilic stage and promoted compost maturity.At the same time,it was confirmed by the increase of the decomposition of organic nitrogen and the transformation of NH_(4)^(+)-N to NO_(3)^(−)-N.Besides,adding biochar carried microbial agent decreased CH_(4),NH_(3) and N_(2)O emissions by 65.23%,42.05%and 68.64%,respectively.The gas emissions were mainly correlated to Chloroflexi,Myxococcota,Acidobacteriota,Firmicutes,and Gemmatimonadota.Redundancy analysis showed that EC and TKN were closely related to bacterial community.Therefore,biochar carried microbial agent is recommended as an effective additive to enhance compost quality and reduce gas emissions during sheep manure composting.
