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《Ecology and Environmental Sciences》 2019-03
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Impacts of Exogenous Nitrogen and Effective Microorganism on the Decomposition of Wheat Straw Residues

ZHU Yuanpeng;JIN Mengcan;MA Chao;GUANG Min;GAO Min;GAO Hongjian;Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/School of Resources and Environment,Anhui Agricultural University;  
To investigate the cooperative effects of nitrogen and effective microorganisms on wheat straw decomposition, the mass loss, hydrolase(ie. cellulase) and oxidase(ie. Lignin peroxidase) activities as well as their roles in decomposition of straw were examined in the field. Four treatments including straw natural composting(S), nitrogen plus straw composting(NS), effective microorganisms plus straw composting(ES) and nitrogen and effective microorganisms plus straw composting(NESS) were conducted in this paper. Results showed that the wheat straw residues decomposition was well fitted the first-order kinetic equation.The decomposition rates of the wheat straw residue under the NS, ES treatments were 74.70% and 73.26%, respectively after incubation for 120 d, while it was 79.83% under the NESS treatment. The decomposition rate constant expressed the trend of K_(NESS)K_(NS)K_(ES)K_S, and the highest decomposition rate constant was found in the treatments of NESS. The nitrogen fertilization combined with effective microorganisms greatly stimulated the decomposition of wheat straw by increasing the activities of peroxidase and thus significantly promote the decomposition of wheat straw(K=0.017, P0.01). In summary, nitrogen fertilizer as well as the effective micro-organism can accelerate the decomposition of wheat straw residues, the former accelerated the decomposition of wheat straw by increasing the activities of hydrolase, whereas the later accelerated the decomposition of wheat straw by increasing the activities of oxidase.
【Fund】: 国家重点研发计划项目(2018YFD0800301;2016YFD0200107;2016YFD0300901;2016YFD030080103)
【CateGory Index】: S141.4
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