Probing potential microbial coupling of carbon and nitrogen cycling during decomposition of maize residue by C-13-DNA-SIP

文献类型： 外文期刊

第一作者： Fan, Fenliang

作者： Fan, Fenliang;Yin, Chang;Li, Zhaojun;Song, Alin;Liang, Yongchao;Tang, Yongjun;Zou, Jun;Wakelin, Steven A.

作者机构：

关键词： Stable isotope probing;Maize;13C;Decomposition;Denitrification;Nitrogen fixation;nifH;nirS

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：7.609； 五年影响因子：8.312 ）

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收录情况： SCI

摘要： The links between microbial taxa, in situ organic matter decomposition, and coupling of carbon (C) and nitrogen (N) cycles remain unresolved. Here, we used stable isotope probing (SIP) technique to investigate bacterial carbon assimilation and C and N coupling during decomposition of C-13-labeled maize residue in a black soil from Northeast China. Bacteria assimilating carbon from maize residue (16S rRNA analysis) were primarily distributed in the Phyla Actinobacteria, Firmicutes and Proteobacteria. These include the recognized stubble decomposing lineages of Arthrobacter, Streptomyces, Bacillus and Rhizobium, but also lineages not previously reported (Agromyces, Blastococcus, Gemmatimonas, Glycomyces, Heliobacillus, Lysobacter, Microlunatus, Myco plasma, Natronocella, Ohtaekwangia, Paenibacillus, Schlegelella, Sorangium, Steroidobacter and Thermacetogenium). Analysis of nitrogen fixation (nifH) and denitrification (nirS) genes in heavy-fraction DNA was used to link microbial taxa involved in N cycling to C transformation of the maize residue. A cluster of nifH genotypes affiliated with Rhizobium and two other 'uncultured' clusters dominated the N-fixing clone library, and genotypes affiliated with Kocuria varians and an uncultured cluster dominated the library of nitrite reducing (nirS) taxa. The results suggest that plant residue decomposition may stimulate both N-fixation and denitrification through direct C-feeding of related microbes in soil

分类号： S1

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