METHANE AND CARBON-DIOXIDE PRODUCTION IN, TRANSPORT THROUGH, AND EFFLUX FROM A PEATLAND
METHANE AND CARBON-DIOXIDE PRODUCTION IN, TRANSPORT THROUGH, AND EFFLUX FROM A PEATLAND
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DOI：
10.1098/rsta.1995.0032
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发表时间：
1995-05-16
期刊：
影响因子：
5
通讯作者：
PEARCE, DME
中科院分区：
文献类型：
--
作者：
CLYMO, RS;PEARCE, DME
泥炭存款在地下水位以上5-50 cm处主要是好氧的，而在其以下的泥炭是缺氧的。50 cm以下泥炭层中CH 4和CO2浓度不随季节变化。浓度在泥炭底部或附近最高，向上呈二次递减，与气体产生速率（CH 4 + CO 2）为0.03 μ mol cm（-3）a（-1）和扩散运动相一致。从深层泥炭的浓度分布图计算出的CH 4向上流出量为1，CO2向上流出量为17 μ mol m（-2）h（-1）。就在地下水位以下，甲烷浓度有一个小峰值。夏季的峰值浓度大于冬季。这表明存在第二个季节性和地方性的、但尚未量化的CH 4源。甲烷从泥炭地表面流出的范围从通常的夏季最大值约200下降到冬季值小于10 μ mol m（-2）h（-1），有时为负值。从小丘流出的流量通常是从洼地流出的流量的三分之一。这些结果表明，甲烷氧化可能是重要的，在驼峰。
The top 5-50 cm of a peat deposit above the water table are predominantly-oxic while below that the peat is anoxic. The concentrations of CH4 and CO2 in the peat below 50 cm do not change with the seasons. The concentrations are greatest at or near the base of the peat and decrease quadratically upwards, consistent with a gas production rate (CH4 + CO2) of 0.03 mu mol cm(-3) a(-1) and movement by diffusion. The upward efflux of CH4, calculated from the concentration profile in deep peat, is 1, and of CO2 is 17 mu mol m(-2) h(-1). Just below the water table there is a small peak in CH4 concentration. The peak concentrations are greater in summer than in winter. This indicates a second, seasonal and local, but not yet quantified source of CH4. Effluxes of CH4 from the peatland surface range from ordinary summer maxima of about 200 down to winter values less than 10 mu mol m(-2) h(-1), and at times negative values. The efflux from hummocks is usually about a third of that from hollows. These results indicate that methane oxidation may be important in hummocks.