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Higher reactivity of allochthonous vs. autochthonous DOC sources in a shallow lake

机译：浅水湖泊中异源和本地DOC来源的反应性更高

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摘要

Dissolved organic carbon (DOC) reactivity in aquatic systems is essentially dependent on DOC precursor material and on the processes regulating its bioavailability, especially photodegradation and microbial activity. We investigated temporal changes (from hours to weeks) in the reactivity of allochthonous and autochthonous DOC sources in a macrophyte-dominated shallow lake using a set of incubation experiments. Changes in DOC fluorescence and absorbance properties due to biodegradation (BD) and to the combined effect of photo- and biodegradation (UV + BD) were traced. Allochthonous DOC was more reactive than autochthonous DOC (AutoDOC), showing higher DOC losses (between 22 and 36 %) and faster changes in DOC properties than AutoDOC. The effect of UV + BD was larger than BD alone for both sources of DOC. The rates of change of DOC properties were stronger during the first days of incubation and showed no regular pattern for any of the treatments or DOC sources. Our findings highlight the relevance of the timescale when assessing changes in DOC quality under different degradation pathways, as well as the need of discussing the labile character usually attributed to autochthonous DOC in systems dominated by submerged vegetation, as many shallow lakes or lagoons.
机译：水生系统中溶解的有机碳（DOC）反应性基本上取决于DOC前体材料以及调节其生物利用度的过程，尤其是光降解和微生物活性。我们使用一组孵化实验研究了以大型植物为主的浅湖中异源和本地DOC源的反应性随时间变化（从几小时到几周）。跟踪了由于生物降解（BD）以及光降解和生物降解的联合作用（UV + BD）而导致的DOC荧光和吸收特性的变化。异源DOC比自生DOC（AutoDOC）更具反应性，与AutoDOC相比，它显示出更高的DOC损失（22％至36％），并且DOC属性的变化更快。对于两种来源的DOC，UV + BD的作用都比单独的BD大。在培养的第一天，DOC特性的变化速率更强，并且对于任何处理或DOC来源均未显示规律性模式。我们的发现凸显了评估不同降解途径下DOC质量变化时时间尺度的相关性，以及讨论许多浅水湖泊或泻湖等淹没植被为主的系统中通常归因于本地DOC的不稳定特征的必要性。

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