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Isotopic fractionation during soil uptake of atmospheric hydrogen

机译：土壤吸收大气中氢的同位素分馏

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Soil uptake of atmospheric hydrogen (H2) and the associated hydrogenisotope effect were studied using soil chambers in a Western Washingtonsecond-growth coniferous forest. Chamber studies were conducted during bothwinter and summer seasons to account for large natural variability in soilmoisture content (4–50%) and temperature (6–22 °C). H2 depositionvelocities were found to range from 0.01–0.06 cm s−1 with an average of0.033 ± 0.008 cm s−1 (95% confidence interval). Consistent withprior studies, deposition velocities were correlated with soil moisturebelow 20% soil moisture content during the summer season. During winter,there was considerable variability observed in deposition velocity that wasnot closely related to soil moisture. The hydrogen kinetic isotope effectwith H2 uptake was found to range from −24‰ to ?109‰.Aggregate analysis of experimental data results in an average KIE of−57 ± 5‰ (95% CI). Some of the variability in KIE can be explained bylarger isotope effects at lower (<10%) and higher (>30%) soilmoisture contents. The measured KIE was also found to be correlated withdeposition velocity, with smaller isotope effects occurring at higherdeposition velocities. If correct, these findings will have an impact on theinterpretation of atmospheric measurements and modeling of δD ofH2.
机译：在华盛顿第二生长的针叶林土壤室内，研究了土壤中大气氢（H 2 ）的吸收以及相关的氢同位素效应。在冬季和夏季都进行了室内试验，以说明土壤水分含量（4–50％）和温度（6–22°C）的大自然变化。 H 2 沉积速度范围为0.01–0.06 cm s -1 ，平均为0.033±0.008 cm s -1 （95 ％置信区间）。与先前的研究一致，夏季沉积速率与土壤含水量低于20％相关。在冬季，观测到的沉积速度变化很大，与土壤水分没有密切关系。发现H 2 吸收的氢动力学同位素效应范围为-24‰至≤109‰。实验数据的综合分析得出KIE的平均KIE为−57±5‰（95％CI）。 KIE的某些变异性可以通过在较低（<10％）和较高（> 30％）的土壤水分含量下更大的同位素效应来解释。还发现测得的KIE与沉积速度相关，在较高的沉积速度下发生较小的同位素效应。如果正确，这些发现将对大气测量的解释和H 2 的δD建模产生影响。

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