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首页> 外文期刊>Environmental earth sciences >Soil temperature and moisture controls on surface fluxes and profile concentrations of greenhouse gases in karst area in central part of Guizhou Province, southwest China
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Soil temperature and moisture controls on surface fluxes and profile concentrations of greenhouse gases in karst area in central part of Guizhou Province, southwest China

机译：贵州中部喀斯特地区土壤温度和湿度对表面通量和温室气体剖面浓度的控制

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摘要

In order to better understand the spatiotemporal variations and interrelationships of greenhouse gases (GHG), monthly surface fluxes and profile concentrations of GHG (CO_2, N_2O and CH_4) in karst areas in the Guizhou Province, southwest China, were measured from June 2006 to May 2007. GHG fluxes showed high variability, with a range of 460.9-1,281.2 mg m~(-2) h~(-1) for CO_2, -25.4 to 81.5 μgm~(-2)h~(-1) for N_2O and -28.7 to -274.9 μg m~(-2)h~(-1) for CH_4 ,but no obvious seasonal change trends of the fluxes existed. Profile concentrations of CO_2, N_2O and CH_4 varied between 0.5 and 31.5 mL L~(-1), 0.273 and 0.734, and 0.1 and 3.5 μL L~(-1) respectively. In general, concentrations of CO_2 and N_2O increased with depth, while CH_4 had an inverse trend. However, in October, November and January, the reversal of depth patterns of GHG concentrations took place below 15 cm, close to the soil-rock interface. The spatiotemporal distribution of CO_2 in soil profile was significantly positively correlated with that of N_2O (p < 0.05-0.01) and negatively correlated with that of CH_4 (p < 0.01). The correlation analysis showed that soil temperature and moisture may be responsible for GHG dynamics in the soils, rather than the exchange of GHG between land and atmosphere.
机译：为了更好地了解温室气体（GHG）的时空变化和相互关系，对2006年6月至5月在中国西南喀斯特地区进行的喀斯特地区月度表面通量和GHG（CO_2，N_2O和CH_4）的剖面浓度进行了测量。 2007.温室气体通量具有较高的变异性，CO_2范围为460.9-1,281.2 mg m〜（-2）h〜（-1），N_2O和-25.4至81.5μgm〜（-2）h〜（-1） CH_4为-28.7至-274.9μgm〜（-2）h〜（-1），但通量没有明显的季节变化趋势。 CO_2，N_2O和CH_4的浓度分别在0.5和31.5 mL L〜（-1），0.273和0.734、0.1和3.5μLL〜（-1）之间变化。通常，CO_2和N_2O的浓度随深度增加，而CH_4则呈反趋势。然而，在10月，11月和1月，靠近土壤-岩石界面的15 cm以下的温室气体浓度深度模式发生了反转。土壤剖面中CO_2的时空分布与N_2O呈正相关（p <0.05-0.01），与CH_4呈负相关（p <0.01）。相关分析表明，土壤温度和湿度可能是造成土壤中GHG动态的原因，而不是土地与大气之间的GHG交换。

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  • 来源
    《Environmental earth sciences》 |2012年第5期|p.1431-1439|共9页
  • 作者

    Liu Fang; Liu Cong-Qiang; Wang Shi-lu; Zhu Zheng-jie;

  • 作者单位

    State Key Laboratory of the Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences,Guiyang 550002, China,Department of Chemistry and Life Science,Baise University, Baise 533000, China;

    State Key Laboratory of the Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences,Guiyang 550002, China;

    State Key Laboratory of the Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences,Guiyang 550002, China;

    Chongqing Institute of Geology and Mineral Resources,Chongqing 400042, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    greenhouse gases flux; karst area; concentration profiles of greenhouse gases;

    机译：温室气体通量;喀斯特地区;温室气体浓度分布;

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