Diffusional limits to the consumption of atmospheric methane by soils
Diffusional limits to the consumption of atmospheric methane by soils
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DOI：
10.1016/0045-6535(93)90455-e
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发表时间：
1993
期刊：
影响因子：
8.8
通讯作者：
R. Striegl
中科院分区：
文献类型：
--
作者：
R. Striegl
大气气体进出土壤系统的净输运主要受沿气体分压梯度扩散的控制。因此，土壤和大气之间的气体通量可以通过对多孔非饱和介质中普通气体扩散方程的推广来估计。土壤顶部几厘米的甲基营养细菌对ch4的消耗导致曝气土壤对大气中ch4的吸收。甲基化营养体消耗ch4的能力通常超过了ch4从大气扩散到消费者的潜力。因此，土壤对大气中ch4的最大吸收速率受扩散的限制，可以通过土壤物理性质和ch4浓度梯度来计算。ch4浓度随深度的变化曲线可以用多孔不饱和介质中均相化学反应的气体扩散方程进行理论描述。这允许在指定深度间隔内计算它们的ch4消耗情况。
Net transport of atmospheric gases into and out of soil systems is primarily controlled by diffusion along gas partial pressure gradients. Gas fluxes between soil and the atmosphere can therefore be estimated by a generalization of the equation for ordinary gaseous diffusion in porous unsaturated media. Consumption of CH4by methylotrophic bacteria in the top several centimeters of soil causes the uptake of atmospheric CH4by aerated soils. The capacity of the methylotrophs to consume CH4commonly exceeds the potential of CH4to diffuse from the atmosphere to the consumers. The maximum rate of uptake of atmospheric CH4by soil is, therefore, limited by diffusion and can be calculated from soil physical properties and the CH4concentration gradient. The CH4concentration versus depth profile is theoretically described by the equation for gaseous diffusion with homogeneous chemical reaction in porous unsaturated media. This allows for calculation of thein siturate of CH4consumption within specified depth intervals.