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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Molecular composition of dissolved organic matter from a wetland plant (Juncus effusus) after photochemical and microbial decomposition (1.25 yr): Common features with deep sea dissolved organic matter
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Molecular composition of dissolved organic matter from a wetland plant (Juncus effusus) after photochemical and microbial decomposition (1.25 yr): Common features with deep sea dissolved organic matter

机译：光化学和微生物分解（1.25年）后湿地植物（水仙）中溶解有机物的分子组成：深海溶解有机物的共同特征

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摘要

We hypothesized that microbial and photochemical processing of dissolved organic matter (DOM) determines its molecular formula composition in aquatic systems to a greater degree than does the original source of the DOM. To test this hypothesis, we exposed DOM from a leachate of a wetland plant (Juncus effusus) to solar radiation or incubated it in the dark for 1.25. yr. Analysis of the extracted DOM of the leachates via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) identified 2800 molecular formulae. Of the formulae in the initial DOM, 11% were lost during microbial decomposition in the dark and 54% under solar radiation. Solar radiation also produced a large number of formulae containing N, that were preferentially degraded by microorganisms (47% loss). We compared the "recalcitrant formulae", i.e. those not degraded in the experiment, with those of DOM from the deep North Pacific Ocean. Of the deep sea DOM formulae, 18% were present in the recalcitrant fraction of the initial DOM. An additional 18% of the formulae in marine DOM were photoproduced and recalcitrant, and 8% were produced by microbes in the experiment. Consequently, 44% of the deep sea DOM shares identical molecular formulae with the recalcitrant DOM from the experiment, most of which were produced by the combined action of sunlight and microbes. This indicates that processes in the water column may be more important than the original source in determining the composition of bulk DOM.
机译：我们假设，溶解性有机物（DOM）的微生物和光化学加工决定了其在水生系统中的分子式组成，其程度要比原始DOM更大。为了验证该假设，我们将湿地植物浸出液（Juncus effusus）中的DOM暴露于太阳辐射或在黑暗中孵育1.25。年。通过傅立叶变换离子回旋共振质谱（FT-ICR-MS）对渗滤液提取的DOM的分析确定了2800个分子式。在初始DOM中，在黑暗中微生物分解过程中损失了11％，在太阳辐射下损失了54％。太阳辐射还产生了大量含有N的配方，这些配方优先被微生物降解（损失47％）。我们将“顽强配方”（即实验中未降解的配方）与北太平洋深海的DOM进行了比较。在深海DOM公式中，初始DOM的顽固成分中存在18％。在实验中，海洋DOM中另外18％的配方是光产生的和难降解的，而8％是由微生物产生的。因此，有44％的深海DOM与该实验的难降解DOM具有相同的分子式，其中大多数是由阳光和微生物的共同作用产生的。这表明在确定散装DOM的组成方面，水柱中的过程可能比原始来源更重要。

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