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Carbonyl sulfide exchange in soils for better estimates of ecosystem carbon uptake

机译：土壤中的羰基硫醚交换，以更好地估计生态系统碳吸收

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Carbonyl sulfide (COS) measurements are one of the emerging tools to better quantify gross primary production (GPP), the largest flux in the global carbon cycle. COS is a gas with a similar structure to CO2; COS uptake is thought to be a proxy for GPP. However, soils are a potential source or sink of COS. This study presents a framework for understanding soil-COS interactions. Excluding wetlands, most of the few observations of isolated soils that have been made show small uptake of atmospheric COS. Recently, a series of studies at an agricultural site in the central United States found soil COS production under hot conditions an order of magnitude greater than fluxes at other sites. To investigate the extent of this phenomenon, soils were collected from five new sites and incubated in a variety of soil moisture and temperature states. We found that soils from a desert, an oak savannah, a deciduous forest, and a rainforest exhibited small COS fluxes, behavior resembling previous studies. However, soil from an agricultural site in Illinois, > 800aEuro-km away from the initial central US study site, demonstrated comparably large soil fluxes under similar conditions. These new data suggest that, for the most part, soil COS interaction is negligible compared to plant uptake of COS. We present a model that anticipates the large agricultural soil fluxes so that they may be taken into account. While COS air-monitoring data are consistent with the dominance of plant uptake, improved interpretation of these data should incorporate the soil flux parameterizations suggested here.
机译：碳基硫醚（COS）测量是新兴工具之一，以更好地量化总初级生产（GPP），全局碳循环中最大的助焊剂。 COS是一种与CO2相似的气体; COS吸收被认为是GPP的代理。然而，土壤是COS的潜在来源或水槽。本研究提出了理解土壤 - COS相互作用的框架。除了湿地，大部分孤立的土壤的观察中的大部分观察都显示出小的大气层。最近，美国中部的农业部位的一系列研究发现土壤COS生产在热条件下大小大于在其他网站的助熔剂。为了研究这种现象的程度，从五个新部位收集土壤，并在各种土壤水分和温度状态下孵育。我们发现来自沙漠，橡树大草原，落叶林和雨林的土壤表现出小的COS势态，行为类似于以前的研究。然而，来自伊利诺伊州农业部位的土壤，距离初始中美洲学习遗址> 800Aeuro-ich，在类似条件下展示了相对的土壤通量。这些新数据表明，与大多数情况下，与植物摄取的COS相比，土壤COS相互作用可以忽略不计。我们提出了一种预期大型农业土壤通量的模型，以便它们可以考虑到它们。虽然COS空气监测数据与植物摄取的主导地位一致，但改善了对这些数据的解释应包含在此提出的土壤助推器参数化。

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