Hydrologic setting constrains lake heterotrophy and terrestrial carbon fate
Hydrologic setting constrains lake heterotrophy and terrestrial carbon fate
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DOI：
10.1002/lol2.10054
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发表时间：
2018-06-01
影响因子：
7.8
通讯作者：
Solomon, Christopher T.
中科院分区：
文献类型：
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作者：
Jones, Stuart E.;Zwart, Jacob A.;Solomon, Christopher T.
目前衡量湖泊过程的努力在很大程度上依赖于经验观察，没有考虑可能调节湖泊中陆地溶解有机碳(TDOC)分解的湖间异质性。我们创建了一个简单的湖泊TDOC分解分析模型，该模型突出了湖泊大小和集水区水文输出的作用。我们的模型预测了水文调节的TDOC分解瞬时速率和湖泊内分解的TDOC负荷比例之间的权衡。我们还预测，在给定的水文停留时间内，蒸发作为水文输出的重要性的变化会导致TDOC分解的显著变化。这些来自湖泊水文环境的TDOC分解模式表明，过去衡量湖泊碳生物地球化学的尝试可能是有偏见的。我们的模型为湖泊碳循环的经验研究提供了背景，并使湖泊碳生物地球化学的知情尺度成为可能。
Current efforts to scale lake processes rely heavily on empirical observations and do not consider inter-lake heterogeneity that is likely to regulate terrestrial dissolved organic carbon (tDOC) decomposition in lakes. We created a simple, analytical model of tDOC decomposition in lakes that highlights the role of lake size and catchment hydrologic export. Our model predicts a hydrologically mediated tradeoff between the instantaneous rate of tDOC decomposition and the fraction of the tDOC load that is decomposed within a lake. We also predict that variation in the importance of evaporation as a hydrologic export generates meaningful variation in tDOC decomposition at a given hydrologic residence time. These patterns of tDOC decomposition that emerge from lakes' hydrologic settings suggest that past attempts to scale lake carbon biogeochemistry may be biased. Our model provides context for empirical studies of lake carbon cycling and enables informed scaling of lake carbon biogeochemistry.