Interactive effects of depth and temperature on CH4 and N2O flux in a shallow podzol
Interactive effects of depth and temperature on CH4 and N2O flux in a shallow podzol
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DOI：
10.1016/j.soilbio.2013.03.003
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发表时间：
2013-07
影响因子：
9.7
通讯作者：
R. Mills;N. Dewhirst;A. Sowerby;B. Emmett;Davey L. Jones
中科院分区：
文献类型：
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作者：
R. Mills;N. Dewhirst;A. Sowerby;B. Emmett;Davey L. Jones
测量和模拟土壤中温室气体的流出对于衡量生态系统对气候和土地利用变化的反应以及对气体排放的潜在贡献和反馈至关重要。含有大量有机物的陆地土壤可以产生大量ch4和潜在的N2O外流，因此了解这种通量对气候（如温度）变化的敏感性是很重要的。在这里，我们考虑浅灰化在ch4和N2O外排温度响应中的作用，使用一个简单的实验室孵育。这样的土壤有一个浅泥炭层，上面覆盖着粗糙的有机质，通过在1-30°C的温度斜坡上分裂和培养这些层，我们观察到两种气体的显著负温度响应，以及对层间差异存在的气体依赖效应。鉴于这些观测结果，有必要考虑近表层的温度敏感性是不同的，并认识到浅层灰化土在温度范围内具有强源汇转换的潜力。
Measuring and modelling the efflux of greenhouse gases from soils is crucial for gauging ecosystem responses to climate and land-use change, and potential contributions and feedbacks to gas emissions. Upland soils with high amounts of organic matter can produce large effluxes of CH4and potentially N2O, and therefore understanding the sensitivity of such fluxes to changes in climate (e.g. temperature) is of importance. Here we consider the role of shallow podzols in the temperature response of CH4and N2O efflux using a simple laboratory incubation. Such soils have a shallow peat layer overlain by coarse organic matter, and by splitting and incubating these layers across a 1–30 °C temperature ramp, we observed a significant negative temperature response for both gases, and a gas-dependent effect on the presence of a between-layer difference. Given these observations, there is a need to consider the temperature sensitivity of near surface layers as distinct, and to recognise the potential for shallow podzols to have a strong source–sink transition across temperature ranges.