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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >The effect of pore structure on ebullition from peat
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The effect of pore structure on ebullition from peat

机译：毛孔结构对泥炭沸腾的影响

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The controls on methane (CH_4) bubbling (ebullition) from peatlands are uncertain, but evidence suggests that physical factors related to gas transport and storage within the peat matrix are important. Variability in peat pore size and the permeability of layers within peat can produce ebullition that ranges from steady to erratic in time and can affect the degree to which CH_4 bubbles bypass consumption by methanotrophic bacteria and enter the atmosphere. Here we investigate the role of peat structure on ebullition in structurally different peats using a physical model that replicates bubble production using air injection into peat. We find that the frequency distributions of number of ebullition events per time and the magnitude of bubble loss from the physical model were similar in shape to ebullition from peatlands and incubated peats. This indicates that the physical model could be a valid proxy for naturally occurring ebullition from peat. For the first time, data on bubble sizes from peat were collected to conceptualize ebullition, and we find that peat structure affects bubble sizes. Using a new method to measure peat macrostructure, we collected evidence that supports the hypothesis that structural differences in peat determine if bubble release is steady or erratic and extreme. Collected pore size data suggest that erratic ebullition occurs when large amounts of gas stored at depth easily move through shallower layers of open peat. In contrast, steady ebullition occurs when dense shallower layers of peat regulate the flow of gas emitted from peat.
机译：泥炭地甲烷（CH_4）冒泡（沸腾）的控制方法尚不确定，但证据表明，与泥炭基质中气体输送和储存有关的物理因素很重要。泥炭孔径大小的变化和泥炭中各层的渗透性可能导致沸腾时间从稳定到不稳定，并且会影响CH_4气泡绕过甲烷营养细菌进入大气的程度。在这里，我们使用物理模型来研究泥炭结构在结构不同的泥炭中的沸腾中的作用，该物理模型使用空气注入泥炭来复制气泡产生。我们发现，每次物理消泡事件次数的频率分布和物理模型产生的气泡损失的大小与泥炭地和温育泥炭的消磁形状相似。这表明物理模型可能是泥炭自然发生的白化的有效代理。首次收集了来自泥炭的气泡大小数据以概念化泡沫，我们发现泥炭的结构会影响气泡大小。我们使用一种新的方法来测量泥炭的宏观结构，我们收集了支持以下假设的证据：泥炭的结构差异决定了气泡释放是稳定的还是不稳定的以及极端的。收集的孔径数据表明，当深处存储的大量气体容易通过浅层的开放泥炭层时，就会发生不稳定的沸腾。相反，当浓密的较浅的泥炭层调节泥炭排放的气体流量时，就会发生稳定的沸腾。

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