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13 June 2018 Carbon allocation and fate in paddy soil depending on phosphorus fertilization and water management: results of 13C continuous labelling of rice
Cornelius Talade Atere, Tida Ge, Zhenke Zhu, Liang Wei, Ping Zhou, Xinhua He, Yakov Kuzyakov, Jinshui Wu
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Abstract

We grew rice in phosphorus (P) deficient subtropical paddy soil in a field study and used 13CO2 continuous labelling to investigate photosynthetic carbon (C) partitioning and allocation under FLOOD versus WET/DRY conditions, with and without P fertilization (80 mg P kg-1). The plants and soil were sampled after each of three WET/DRY cycles to determine 13C allocation in above- and belowground plant biomass, microbial biomass, the rhizosphere, and bulk soil. Irrespective of water management, P-fertilized plants had higher biomass and P content and more total 13C in the rice-soil system, especially the 13C incorporation into the shoots (51%–96%), than samples without P fertilization. Root and bulk-soil 13C were largely independent of both P fertilization and water management. However, by the third sampling, P fertilization had increased the amount of 13C and microbial biomass 13C in the rhizosphere soil (RS) by 28% (WET/DRY) and 95% (FLOOD), and by 47% (WET/DRY) and 50% (FLOOD), respectively. The WET/DRY condition had significantly higher microbial biomass and 13C contents than FLOOD condition only in the RS. These results indicate that a well-established aboveground plant biomass following P fertilization is required to increase belowground C allocation. Thus, WET/DRY conditions, like FLOOD conditions, can provide moisture sufficient for unhindered P availability in rice-paddy system.

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Cornelius Talade Atere, Tida Ge, Zhenke Zhu, Liang Wei, Ping Zhou, Xinhua He, Yakov Kuzyakov, and Jinshui Wu "Carbon allocation and fate in paddy soil depending on phosphorus fertilization and water management: results of 13C continuous labelling of rice," Canadian Journal of Soil Science 98(3), 469-483, (13 June 2018). https://doi.org/10.1139/cjss-2018-0008
Received: 8 January 2018; Accepted: 24 May 2018; Published: 13 June 2018
JOURNAL ARTICLE
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KEYWORDS
biomasse microbienne
carence en phosphore
gestion de l’eau
microbial biomass
paddy soil
phosphorus deficiency
photosynthèse du C par le riz
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