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首页> 外文期刊>European Journal of Soil Biology >Alteration in enzymatic stoichiometry controls the response of soil organic carbon dynamic to nitrogen and water addition in temperate cultivated grassland
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Alteration in enzymatic stoichiometry controls the response of soil organic carbon dynamic to nitrogen and water addition in temperate cultivated grassland

机译：酶化学计量的改变控制了温带栽培草原中土壤有机碳动力学对氮气的响应

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摘要

Cultivated grassland can serve as one solution to the degradation of natural grassland. However, less is understood of the response of the microbial communities in cultivated grassland soils to global change factors such as nitrogen (N) deposition and precipitation change, and their linkages with the dynamics of soil organic carbon (SOC). In this study, field experimental plots that simulate different N deposition and precipitation levels were established to investigate the responses of soil microbial communities and their linkages with particulate-sized SOC fractions. Results showed that the activities of hydrolytic enzymes responded significantly to N addition, watering and their combinations, whereas the abundance and composition of microbial communities showed no significant difference among treatments. Addition of N and water generally promoted the activities of N degrading enzymes such as beta-N-acetylglucosaminidase (NAG) and leucine aminopeptidase (LAP), and thus decreased the Cto N-degrading activity (enzyme C/N ratio). This decrease in enzyme C/N ratio was significantly correlated with the accumulation of microbial-accessible particulate organic carbon (POC), indicating that three years of N application did not alleviate microbial N limitation so that microbial communities had invested more in acquisition of N instead of C. In contrast, the content of microbial-inaccessible mineral associated organic carbon (MAOC) was decreased probably as a result of N limitation on the suppressed microbial growth. Collectively, these results highlight that stoichiometric deviation between substrate and microbial demand can be one critical driver for SOC dynamics in cultivated grassland under global change scenarios.
机译：None

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  • 来源
    《European Journal of Soil Biology》 |2020年第1期|共11页
  • 作者

    Xu Meng; Xu Lijun; Fang Huajun; Cheng Shulan; Yu Guangxia; Yang Yan; Lu Mingzhu;

  • 作者单位

    Chinese Acad Sci Inst Geog Sci &

    Nat Resources Res Key Lab Ecosyst Network Observat &

    Modeling Beijing 100101 Peoples R China;

    Chinese Acad Agr Sci Inst Agr Resources &

    Reg Planning Hulunber Grassland Ecosyst Observat &

    Res Stn Beijing 100081 Peoples R China;

    Chinese Acad Sci Inst Geog Sci &

    Nat Resources Res Key Lab Ecosyst Network Observat &

    Modeling Beijing 100101 Peoples R China;

    Univ Chinese Acad Sci Coll Resources &

    Environm Beijing 100049 Peoples R China;

    Univ Chinese Acad Sci Coll Resources &

    Environm Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Geog Sci &

    Nat Resources Res Key Lab Ecosyst Network Observat &

    Modeling Beijing 100101 Peoples R China;

    Chinese Acad Sci Inst Geog Sci &

    Nat Resources Res Key Lab Ecosyst Network Observat &

    Modeling Beijing 100101 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

    Global change factors; Soil microbial communities; Enzyme activity; Soil organic carbon fraction; Cultivated grassland;

    机译：全球变革因子;土壤微生物社区;酶活性;土壤有机碳馏分;栽培草地;

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