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《Transactions of the Chinese Society for Agricultural Machinery》 2016-12
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Impacts of Biochar on Major Forms Contents and Conservation Mechanism of Nitrogen during Aerobic Composting of Chicken Manure

Liu Ning;Zhou Jialiang;Ma Shuangshuang;Han Lujia;Huang Guangqun;College of Engineering,China Agricultural University;  
It is of great significance to investigate the impacts of biochar on the quantity of major nitrogen forms and conservation mechanism of nitrogen during aerobic composting of chicken manure,which could provide some theoretical supports for future study on NH_3 emission,nitrogen loss,and composting process optimization. Chicken manure and wheat straw were used as primary materials,and proper amount of biochar was added to conduct aerobic composting with an intelligent aerobic composting reactor system.Based on the physicochemical and biological indicators and dynamic data of major nitrogen forms,combined with analysis of scanning electron microscopy and the quantity variation of main microbial communities,the quantity variation of major nitrogen forms was studied and the conservation mechanism of nitrogen was illustrated. Conclusions were drawn as follows: adding proper amount of biochar could yield less NH_3 emission and nitrogen loss; there were significant positive correlation between NH_4~+-N concentration and NH_3emission( r = 0. 783,p = 0. 037 0. 05). There were highly significant negative correlation between NO_3~--N concentrationand NH_3emission( r =- 0. 941,p = 0. 017 0. 05). The results showed that cellular structure of biochar could effectively adsorb various nitrogen such as NH_3 and NH_4~+-N,reduce NH_4~+-N concentration in the pile,and thus reduce the NH_3 emission effectively. In addition,biochar could provide appropriate refuge for nitrifying bacteria,promote the nitration reaction,and then inhibit NH_3 volatilization.
【Fund】: 教育部新世纪优秀人才支持计划项目(NCET-12-0524);; 国家国际科技合作专项(2015DFA90370)
【CateGory Index】: S141.4
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