Fate of rice shoot and root residues, rhizodeposits, and microbe-assimilated carbon in paddy soil - Part 1: Decomposition and priming effect

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dc.identifier.uri http://dx.doi.org/10.15488/724
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/748
dc.contributor.author Zhu, Zhenke
dc.contributor.author Zeng, Guanjun
dc.contributor.author Ge, Tida
dc.contributor.author Hu, Yajun
dc.contributor.author Tong, Chengli
dc.contributor.author Shibistova, Olga
dc.contributor.author He, Xinhua
dc.contributor.author Wang, Juan
dc.contributor.author Guggenberger, Georg
dc.contributor.author Wu, Jinshui
dc.date.accessioned 2016-11-24T12:51:18Z
dc.date.available 2016-11-24T12:51:18Z
dc.date.issued 2016
dc.identifier.citation Zhu, Z.; Zeng, G.; Ge, T.; Hu, Y.; Tong, C. et al.: Fate of rice shoot and root residues, rhizodeposits, and microbe-assimilated carbon in paddy soil - Part 1: Decomposition and priming effect. In: Biogeosciences 13 (2016), Nr. 15, S. 4481-4489. DOI: http://dx.doi.org/10.5194/bg-13-4481-2016
dc.description.abstract The input of recently photosynthesized C has significant implications on soil organic C sequestration, and in paddy soils, both plants and soil microbes contribute to the overall C input. In the present study, we investigated the fate and priming effect of organic C from different sources by conducting a 300-day incubation study with four different 13C-labelled substrates: rice shoots (shoot-C), rice roots (root-C), rice rhizodeposits (rhizo-C), and microbe-assimilated C (micro-C). The efflux of both 13CO2 and 13CH4 indicated that the mineralization of C in shoot-C-, root-C-, rhizo-C-, and micro-C-treated soils rapidly increased at the beginning of the incubation and decreased gradually afterwards. The highest cumulative C mineralization was observed in root-C-treated soil (45.4 %), followed by shoot-C- (31.9 %), rhizo-C- (7.90 %), and micro-C-treated (7.70 %) soils, which corresponded with mean residence times of 39.5, 50.3, 66.2, and 195 days, respectively. Shoot and root addition increased C emission from native soil organic carbon (SOC), up to 11.4 and 2.3 times higher than that of the control soil by day 20, and decreased thereafter. Throughout the incubation period, the priming effect of shoot-C on CO2 and CH4 emission was strongly positive; however, root-C did not exhibit a significant positive priming effect. Although the total C contents of rhizo-C- (1.89 %) and micro-C-treated soils (1.90 %) were higher than those of untreated soil (1.81 %), no significant differences in cumulative C emissions were observed. Given that about 0.3 and 0.1 % of the cumulative C emission were derived from labelled rhizo-C and micro-C, we concluded that the soil organic C-derived emissions were lower in rhizo-C- and micro-C-treated soils than in untreated soil. This indicates that rhizodeposits and microbe-assimilated C could be used to reduce the mineralization of native SOC and to effectively improve soil C sequestration. The contrasting behaviour of the different photosynthesized C substrates suggests that recycling rice roots in paddies is more beneficial than recycling shoots and demonstrates the importance of increasing rhizodeposits and microbe-assimilated C in paddy soils via nutrient management. eng
dc.description.sponsorship National Natural Science Foundation of China/41430860
dc.description.sponsorship National Natural Science Foundation of China/41371304
dc.description.sponsorship Chinese Academy of Sciences/XDB15020401
dc.description.sponsorship Key Laboratory of Agro-ecological Processes in Subtropical Region
dc.description.sponsorship Chinese Academy of Sciences Institute of Subtropical Agriculture/ISA2015101
dc.description.sponsorship State Administration of Foreign Experts Affairs
dc.language.iso eng
dc.publisher Göttingen : Copernicus GmbH
dc.relation.ispartofseries Biogeosciences 13 (2016), Nr. 15
dc.rights CC BY 3.0 Unported
dc.rights.uri http://creativecommons.org/licenses/by/3.0/
dc.subject rice eng
dc.subject carbon eng
dc.subject paddy foil eng
dc.subject subtropical agriculture eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Fate of rice shoot and root residues, rhizodeposits, and microbe-assimilated carbon in paddy soil - Part 1: Decomposition and priming effect
dc.type article
dc.type Text
dc.relation.issn 1726-4170
dc.relation.doi http://dx.doi.org/10.5194/bg-13-4481-2016
dc.bibliographicCitation.issue 15
dc.bibliographicCitation.volume 13
dc.bibliographicCitation.firstPage 4481
dc.bibliographicCitation.lastPage 4489
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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