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首页> 外文期刊>Soil Science and Plant Nutrition >Drivers of nitrous oxide fluxes from the semi-arid Leymus chinensis grassland in Inner Mongolia, China.
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Drivers of nitrous oxide fluxes from the semi-arid Leymus chinensis grassland in Inner Mongolia, China.

机译：内蒙古半干旱羊草草原一氧化二氮通量的驱动因子。

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Nitrous oxide (N2O) flux in the semi-arid Leymus chinensis (Trin.) Tzvel. grassland in Inner Mongolia, China was measured for two years (from January 2005 to December 2006) with the enclosed chamber technique. The measurements were made twice per month in the growing season and once per month in the non-growing season. To evaluate the effect of aboveground vegetation on N2O emission, the ecosystem N2O flux over the grassland was measured, and concurrently soil N2O flux was measured after the removal of all the aboveground biomass. The possible effect of water-heat factors on N2O fluxes was statistically examined. The ecosystem N2O flux ranged from 0.21 to 0.26 kg nitrous oxide-nitrogen (N2O-N) ha-1 year-1, indicating that the Leymus chinensis grassland of Inner Mongolia was a source for the atmospheric N2O. There was no significant difference between the ecosystem N2O flux and the soil N2O flux. The ecosystem N2O flux was under similar environmental control as the soil N2O flux. Soil moisture was the primary driving factor of the N2O fluxes in the growing season of both years; the changes in water-filled pore space (WFPS) of soil surface layers could explain 45-67% of the variations in N2O fluxes. The high seasonal variation of the N2O fluxes in the growing seasons was regulated by the distribution of effective rainfall, rather than the precipitation intensity. While in the non-growing season, the N2O fluxes were restricted much more by air temperature or soil temperature, and 83-85% of the variations of the N2O fluxes were induced by changes in temperature conditions.
机译：半干旱羊草（Trin。）Tzvel中的一氧化二氮（N 2 O）通量。使用封闭室技术对中国内蒙古的草原进行了为期两年（从2005年1月至2006年12月）的测量。在生长季节每月进行两次测量，在非生长季节每月进行一次测量。为了评估地上植被对N 2 O排放的影响，测量了草地上生态系统N 2 O的通量，同时测定了土壤N 2 O通量。统计分析了水热因子对N 2 O通量的可能影响。生态系统N 2 O的通量范围为0.21至0.26 kg一氧化二氮-氮（n 2 ON）ha -1 年- 1 ，表明内蒙古羊草草原是大气N 2 O的来源。生态系统N 2 O通量与土壤N 2 O通量之间无显着差异。生态系统N 2 O通量与土壤N 2 O通量处于相似的环境控制之下。两年生长期土壤水分是N 2 O通量的主要驱动因子。土壤表层充水孔隙空间（WFPS）的变化可以解释N 2 O通量变化的45-67％。 N 2 通量在生长季节的高季节性变化是由有效降雨的分布而不是降水强度来调节的。在非生长季节，N 2 通量受空气温度或土壤温度的影响更大，N 2 变化的83-85％ O通量是由温度条件的变化引起的。

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