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Carbon and nitrogen availability in paddy soil affects rice photosynthate allocation, microbial community composition, and priming: combining continuous <sup>13</sup>C labeling with PLFA analysis

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dc.contributor.author Wu J.
dc.contributor.author Kuzyakov Y.
dc.date.accessioned 2019-01-22T20:33:52Z
dc.date.available 2019-01-22T20:33:52Z
dc.date.issued 2018
dc.identifier.issn 0032-079X
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/147731
dc.description.abstract © 2018, Springer Nature Switzerland AG. Background and aims: Carbon (C) and nitrogen (N) availability in soil change microbial community composition and activity and so, might affect soil organic matter (SOM) decomposition as well as allocation of plant assimilates. The study was focused on interactions between C and N availability and consequences for rhizodeposition and microbial community structure in paddy soil. Methods: Rice continuously labeled in a 13CO2 atmosphere was fertilized with either carboxymethyl cellulose (CMC) (+C), ammonium sulfate (+N), or their combination (+CN), and unfertilized soil was used as a control. 13C was traced in aboveground and belowground plant biomass, soil organic matter, and microbial biomass. Microbial community composition was analyzed by phospholipid fatty acids (PLFAs). Results: +CN application led to a higher yield and lower root C and N content: 13C assimilated in shoots increased by 1.39-fold and that in roots decreased by 0.75-fold. Correspondingly, after +CN addition, 13C from rhizodeposits incorporated into SOM and microorganisms decreased by 0.68-fold and 0.53-fold, respectively, as compared with that in the unfertilized soil. The application of +C or + N alone resulted in smaller changes. CMC led to a 3% of total N mobilized from SOM and resulted in a positive priming effect. Both fertilizations (+C, +N, or + CN) and plant growth stages affected soil microbial community composition. With decreasing microbial biomass C and N, and PLFA content under +CN amendment, +CN fertilization decreased Gram-positive (G+)/ Gram-negative (G-) ratios, and resulted in lower G+ bacteria and fungi abundance, whereas G- and actinomycetes were stimulated by N fertilization. Conclusions: Organic C fertilization led to a positive N priming effect. Organic C and mineral N application decreased C input by rhizodeposition associated with lower 13C recovery in SOM and microbial incorporation. C and N addition also altered microbial community composition, as +CN decreased content of microbial groups, such as G+ bacteria and fungi, but +N stimulated G- bacteria and actinomycetes.
dc.relation.ispartofseries Plant and Soil
dc.subject Belowground photosynthate allocation
dc.subject Continuous CO labeling 13 2
dc.subject GC-IRMS
dc.subject N priming effect
dc.subject Phospholipid fatty acid analysis
dc.subject Rice rhizodeposition
dc.title Carbon and nitrogen availability in paddy soil affects rice photosynthate allocation, microbial community composition, and priming: combining continuous <sup>13</sup>C labeling with PLFA analysis
dc.type Article in Press
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS0032079X-2018-SID85056321171


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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