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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 (CO2, N2O and CH4) 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 CO2, −25.4 to 81.5 μg m−2 h−1 for N2O and −28.7 to −274.9 μg m−2 h−1 for CH4, but no obvious seasonal change trends of the fluxes existed. Profile concentrations of CO2, N2O and CH4 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 CO2 and N2O increased with depth, while CH4 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 CO2 in soil profile was significantly positively correlated with that of N2O (p  0.05–0.01) and negatively correlated with that of CH4 (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：为了更好地理解温室气体（GHG）的时空变化和相互关系，月表面通量和GHG（CO 2 ，N 2 O和CH 4 ）进行了测量。GHG通量显示出高度的变异性，范围为460.9–1,281.2 mg m −2 2 的h -1 ，对于N 25.4至81.5μgm −2 h -1 sub <2 O和CH 4 的−28.7至−274.9μg m −2 h −1 ，但没有明显的季节性通量存在变化趋势。 CO 2 ，N 2 O和CH 4 的浓度在0.5至31.5mL L -1 之间变化，分别为0.273和0.734，以及0.1和3.5μLL -1 。通常，CO 2 和N 2 O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，温室气体浓度的深度模式发生了反转，其变化趋势是在15 cm以下，接近土壤-岩石界面。土壤剖面中CO 2 的时空分布与N 2 O呈正相关（p <0.05-0.01），与CH 呈负相关4 （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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