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Contrasting resilience of soil microbial biomass,microbial diversity and ammonification enzymes under three applied soil fumigants

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Journal of Integrative Agriculture 2020年第10期19卷 2561-2570页

作者： SUN Zhen-cai LI Gui-tong ZHANG Cheng-lei WANG Zhi-min LIN Qi-mei ZHAO Xiao-rong College of Agronomy China Agricultural UniversityBejing 100193P.R.China College of Land Science and Technology China Agricultural UniversityBeijing 100193P.R.China Institute of Process Engineering Chinese Academy of SciencesBejing 100190P.R.China

Fumigation is a widely applied approach to mitigate the soil-borne ***,the potential effects of currently applied fumigants on ammonification remain *** 84-day incubation experiment was conducted based on non-fumigated soil(CK)and fumigated soil using three common fumigants,i.e.,chloropicrin(CP),1,3-dichloropropene(1,3-D),and metam sodium(MS).The results showed that,the three fumigants all decreased the microbial C,and the largest reduction(84.7%)occurred with the application of *** fumigation,the microbial diversity in the CP treatment rapidly recovered,but that in the 1,3-D treatment decreased and did not recover by the end of the *** application of MS showed no impact on the microbial diversity during the assay,indicating that significantly different microbial diversity can be achieved by choosing different ***,the three fumigants showed divergent effects on the enzymes involved in *** analysis showed that the enzyme variation with CP application was mainly associated with the changed microbial C and N(Pmicrobial community,which was different from the observed effects of 1,3-D or MS *** addition,the soil quality index showed that CP was still significantly harmful at the end of incubation compared with the good resilience of MS,indicating that CP may not be a suitable fumigant.

关键词： chloropicrin 1,3-dichloropropene metam sodium N cycling microbial biomass and diversity

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