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Effects of root exudate stoichiometry on CO2 emission from paddy soil

机译：根渗出物化学计量对水稻土二氧化碳排放的影响

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摘要

Root exudates are a labile source of carbon (C) for microorganisms that can lead to increased CO2 emission. Root exudates can vary in C:N stoichiometric ratio and their impact on microbially driven soil organic matter (SOM) turnover in paddy soils still remains unclear. The objective was to explore the underlying mechanisms involved in SOM decomposition due to root exudate (artificial) addition with three different C:N ratios (10, 20, and 40) during 45 days incubation. Different root exudates C:N ratios were obtained by adding mineral N and exudate components (glucose, oxalic acid, and glutamate) to paddy soil. N-only addition decreased dissolved organic C to limit CO2 emissions, which is an indicative of C sequestration. Conversely, simulated C:N stoichiometric ratios of root exudates significantly increased both microbial activity and metabolism without altering the microbial biomass C:N ratio. However, soil available dissolved organic C to NH4+ ratio decreased by exudates addition. The stoichiometric ratio of key C and N compound degrading enzymes activities increased only with C:N = 10 and remained unchanged with exudates C:N = 20 and 40. The qCO(2) values increased with decreasing N-containing compounds in root exudates (i.e. highest CO2 emission was observed under C:N = 40 exudates addition). The results suggest that increasing exudates C:N ratio intensify CO2 emission due to high microbial N demand. Overall result show that root exudates C:N ratio and soil available N co-regulate on CO2 emission, which was controlled by microbial and potential extracellular enzyme activities.
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  • 来源
    《European Journal of Soil Biology》 |2020年第1期|共8页
  • 作者

    Liu Yuhuai; Shahbaz Muhammad; Ge Tida; Zhu Zhenke; Liu Shoulong; Chen Liang; Wu Xiaohong; Deng Yangwu; Lu Shunbao; Wu Jinshui;

  • 作者单位

    Jiangxi Normal Univ Coll Life Sci Nanchang 330022 Jiangxi Peoples R China;

    Swedish Univ Agr Sci Dept Soil &

    Environm S-75007 Uppsala Sweden;

    Jiangxi Normal Univ Coll Life Sci Nanchang 330022 Jiangxi Peoples R China;

    Chinese Acad Sci Inst Subtrop Agr Changsha Res Stn Agr &

    Environm Monitoring Changsha 410125 Hunan Peoples R China;

    Chinese Acad Sci Inst Subtrop Agr Changsha Res Stn Agr &

    Environm Monitoring Changsha 410125 Hunan Peoples R China;

    Cent South Univ Forestry &

    Technol Fac Life Sci &

    Technol 498 Shaoshan South Rd Changsha 410004 Hunan Peoples R China;

    Cent South Univ Forestry &

    Technol Fac Life Sci &

    Technol 498 Shaoshan South Rd Changsha 410004 Hunan Peoples R China;

    Jiangxi Univ Sci &

    Technol Sch Resources &

    Environm Engn Ganzhou 341000 Jiangxi Peoples R China;

    Jiangxi Normal Univ Coll Life Sci Nanchang 330022 Jiangxi Peoples R China;

    Chinese Acad Sci Inst Subtrop Agr Changsha Res Stn Agr &

    Environm Monitoring Changsha 410125 Hunan Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤生物学;
  • 关键词

    Root exudates; Carbon cycle; Soil organic matter; Stoichiometry; Paddy soil;

    机译：根出渗出物;碳循环;土壤有机物;化学计量;水稻土;

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