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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Subsurface approaches for measuring soil CO_2 isotopologue flux: Theory and application
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Subsurface approaches for measuring soil CO_2 isotopologue flux: Theory and application

机译：地下土壤CO_2同位素通量测量方法：理论与应用

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摘要

Measurements of the stable isotope composition of soil flux have many uses, from separating autotrophic and heterotrophic components of respiration to teasing apart information about gas transport physics. While soil flux chambers are typically used for these measurements, subsurface approaches are becoming more accessible with the introduction of field-deployable isotope analyzers. These subsurface measurements have the unique benefit of offering depth-resolved isotopologue flux data, which can help to disentangle themany soil respiration processes that occur throughout the soil profile. These methods are likely to grow in popularity in the coming years and a solidmethodological basis needs to be formed in order for data collected in these subsurface studies to be interpreted properly. Here we explore the range of possible techniques that could be used for subsurface isotopologue gas interpretation and rigorously test the assumptions and application of each approach using a combination of numerical modeling, laboratory experiments, and field studies. Our results suggest that methodological uncertainties arise due to poor assumptions and mathematical instabilities but certain methods, particularly those based on diffusion physics, are able to cope with these uncertainties well and produce excellent depth-resolved isotopologue flux data.
机译：测量土壤通量的稳定同位素组成具有许多用途，从分离呼吸的自养成分和异养成分到分离有关气体传输物理学的信息。尽管通常使用土壤通量室进行这些测量，但随着可现场部署的同位素分析仪的引入，地下方法变得越来越容易使用。这些地下测量具有提供深度解析的同位素流通量数据的独特优势，这可以帮助弄清整个土壤剖面中发生的许多土壤呼吸过程。在未来几年中，这些方法可能会越来越流行，并且需要形成坚实的方法论基础，以便正确解释在这些地下研究中收集的数据。在这里，我们探索了可用于地下同位素同位素气体解释的可能技术的范围，并结合了数值模型，实验室实验和现场研究，严格测试了每种方法的假设和应用。我们的结果表明，方法学上的不确定性是由于不良的假设和数学上的不稳定性而引起的，但是某些方法（尤其是基于扩散物理学的方法）能够很好地应对这些不确定性，并产生出色的深度解析同位素同位素通量数据。

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