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首页> 外文期刊>Plant and Soil >Temporal and spatial variability in soil CO2 efflux in the patagonian steppe
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Temporal and spatial variability in soil CO2 efflux in the patagonian steppe

机译：巴塔哥尼亚草原土壤二氧化碳排出中的时间和空间变异性

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摘要

Aims Soil respiration is a major flux of CO2 to the atmosphere. Despite its significance there is a limited understanding of its magnitude, controlling factors and how it varies over time and space in arid ecosystems. We evaluated the temporal pattern of soil CO2 efflux and their response to rain pulses in a patagonian steppe, taking into account the spatial heterogeneity (bare soil and vegetated patches). Materials and methods We measured soil CO2 efflux in bare soil and vegetated patches along the year. We also analyzed physical and chemical soil traits, root density and heterotrophic bacterial count. Results Soil water content and temperature exhibited seasonal variability and it was larger in bare soil patches than in vegetated patches. Root density, organic matter and phosphorus were higher in vegetated patches than in bare soil. CO2 efflux was 48% higher in vegetated patches than in bare soil patches. Soil CO2 efflux decreased from summer to winter, reaching its maximum value (about 0.6 mu mol m(2) s(-1)) in spring. In both patch types, soil CO2 efflux was explained by the interaction between soil temperature and soil water content. Soil CO2 efflux also was positively correlated with soil root density. Bare soil and vegetated patches exhibited distinct response to a rain pulses. Vegetated patches were highly sensitive to rainfall events, generating a large CO2 pulse, returning to previous values after three days. Bare soil CO2 efflux did not exhibit significant changes after a rain pulse. Conclusions In patagonian arid ecosystems, the seasonal variation in soil respiration is explained mainly by the interaction between soil temperature and water content. Bare soil patches had higher water content but lower root density resulting in lower soil CO2 respiration than vegetated patches. However, at ecosystem level the contribution of bare soil to total soil CO2 efflux was similar to the contribution of vegetated patches because bare soil cover is 65% in the study area. Changes in the number of small rain events as well as changes in plant cover could have large consequences on soil ecology and biochemistry in dry and heterogeneous ecosystems.
机译：AIMS土壤呼吸是大气中的二氧化碳的主要通量。尽管其重要性有限地了解其幅度，控制因素以及如何随着时间和空间在干旱生态系统中变化。我们评估了土壤二氧化碳流出的时间模式，并考虑到空间异质性（裸土壤和植被斑块），对雨田草原中的雨脉冲的响应。我们在一年中测量了裸土壤和植被斑块的土壤二氧化碳流出。我们还分析了物理和化学土壤性状，根密度和异养细菌计数。结果土壤含水量和温度表现出季节性变异性，裸土壤斑块比植被斑块更大。植被斑块的根密度，有机物和磷在裸露的土壤中较高。植被斑块的CO2 Efflux在裸露土壤贴片中较高48％。土壤二氧化碳流出从夏季到冬季降低，速度达到其春季的最大值（约0.6μmm（2）S（-1））。在斑块类型中，通过土壤温度和土壤含水量之间的相互作用来解释土壤二氧化碳流出。土壤二氧化碳流出也与土根密度呈正相关。裸露的土壤和植被贴片表现出对雨水脉冲的明显反应。植被贴片对降雨事件的高度敏感，产生大的CO2脉冲，在三天后返回先前的值。裸露的土壤二氧化碳排出在雨脉冲后没有表现出显着的变化。结论在巴塔哥拉那干旱生态系统中，土壤呼吸的季节变异主要通过土壤温度和含水量之间的相互作用来解释。裸露土壤贴片具有较高的含水量，但较低的根密度导致较低的土壤二氧化碳呼吸而不是植被斑块。然而，在生态系统级别，裸土对整个土壤二氧化碳流出的贡献类似于植被斑块的贡献，因为裸露的土壤覆盖在研究区内为65％。小雨事件数量的变化以及植物覆盖的变化可能对干燥和异质生态系统的土壤生态和生物化学产生巨大后果。

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  • 来源
    《Plant and Soil》 |2019年第2期|共12页
  • 作者

    Silletta Luisina Carbonell; Cavallaro Agustin; Kowal Ruth; Pereyra Daniel A.; Silva Roxana A.; Arias Nadia S.; Goldstein Guillermo; Scholz Fabian G.; Bucci Sandra J.;

  • 作者单位

    Consejo Nacl Invest Cient &

    Tecn Inst Biociencias Patagonia INBIOP Grp Estudios Biofis &

    Ecofisiol GEBEF RA-9000 Comodoro Rivadavia Argentina;

    Consejo Nacl Invest Cient &

    Tecn Inst Biociencias Patagonia INBIOP Grp Estudios Biofis &

    Ecofisiol GEBEF RA-9000 Comodoro Rivadavia Argentina;

    Consejo Nacl Invest Cient &

    Tecn Inst Biociencias Patagonia INBIOP Grp Estudios Biofis &

    Ecofisiol GEBEF RA-9000 Comodoro Rivadavia Argentina;

    Consejo Nacl Invest Cient &

    Tecn Inst Biociencias Patagonia INBIOP Grp Estudios Biofis &

    Ecofisiol GEBEF RA-9000 Comodoro Rivadavia Argentina;

    CONICET UNPSJB INBIOP Grp Microbiol Bacteriana Comodoro Rivadavia Argentina;

    Consejo Nacl Invest Cient &

    Tecn Inst Biociencias Patagonia INBIOP Grp Estudios Biofis &

    Ecofisiol GEBEF RA-9000 Comodoro Rivadavia Argentina;

    UBA CONICET Inst Ecol Genet &

    Evoluc Buenos Aires Buenos Aires DF Argentina;

    Consejo Nacl Invest Cient &

    Tecn Inst Biociencias Patagonia INBIOP Grp Estudios Biofis &

    Ecofisiol GEBEF RA-9000 Comodoro Rivadavia Argentina;

    Consejo Nacl Invest Cient &

    Tecn Inst Biociencias Patagonia INBIOP Grp Estudios Biofis &

    Ecofisiol GEBEF RA-9000 Comodoro Rivadavia Argentina;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;
  • 关键词

    Arid ecosystem; Soil respiration; Rain pulse; Plant roots;

    机译：干旱生态系统;土壤呼吸;雨脉;植物根;

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