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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Assessing the Chemistry and Bioavailability of Dissolved Organic Matter From Glaciers and Rock Glaciers
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Assessing the Chemistry and Bioavailability of Dissolved Organic Matter From Glaciers and Rock Glaciers

机译：评估冰川和岩石冰川溶解有机物的化学和生物利用度

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As glaciers thaw in response to warming, they release dissolved organic matter (DOM) to alpine lakes and streams. The United States contains an abundance of both alpine glaciers and rock glaciers. Differences in DOM composition and bioavailability between glacier types, like rock and ice glaciers, remain undefined. To assess differences in glacier and rock glacier DOM we evaluated bioavailability and molecular composition of DOM from four alpine catchments each with a glacier and a rock glacier at their headwaters. We assessed bioavailability of DOM by incubating each DOM source with a common microbial community and evaluated chemical characteristics of DOM before and after incubation using untargeted gas chromatography-mass spectrometry-based metabolomics. Prior to incubations, ice glacier and rock glacier DOM had similar C:N ratios and chemical diversity, but differences in DOM composition. Incubations with a common microbial community showed that DOM from ice glacier meltwaters contained a higher proportion of bioavailable DOM and resulted in greater bacterial growth efficiency. After incubation, DOM composition from each source was statistically indistinguishable. This study provides an example of how MS-based metabolomics can be used to assess effects of DOM composition on differences in bioavailability of DOM. Furthermore, it illustrates the importance of microbial metabolism in structuring composition of DOM. Even though rock glaciers had significantly less bioavailable DOM than ice glaciers, both glacial types still have potential to be important sources of bioavailable DOM to alpine headwaters over the coming decades.
机译：作为冰川解冻的响应变暖，它们将溶解有机物（DOM）释放到高山湖泊和流。美国含有丰富的阿尔卑斯山冰川和岩石冰川。冰川类型之间的DOM组成和生物利用度的差异，如岩石和冰冰川，仍然是未定义的。评估冰川和岩石冰川DOM的差异，我们评估了来自四个高山集水区的Dom的生物利用度和分子组成，每个都有冰川和冰川的冰川。我们通过用普通的微生物群落孵育每个DOM来源评估DOM的生物利用度，并使用未标准的气相色谱 - 质谱 - 质谱基代代谢物在孵育之前和孵育前后的DOM的化学特征。在孵化之前，冰冰川和岩石冰川DOM具有类似的C：N比率和化学多样性，但DOM组成的差异。与常见的微生物群落孵育表明，来自冰冰川熔融疏水的DOM含有更高比例的生物可利用的DOM，导致细菌生长效率更大。孵育后，每个来源的DOM组成是统计学上的。该研究提供了MS的代谢组科如何使用基于MS的代谢组合物来评估DOM组成对DOM生物利用度差异的影响。此外，它说明了微生物代谢在结构化组合物中的重要性。尽管岩石冰川的生物可利用主义明显不那么少于冰冰川，但两种冰川类型仍然有可能在未来几十年中成为生物可利用的DOM的重要来源。

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