Linking allochthonous dissolved organic matter and boreal lake sediment carbon sequestration: The role of light‐mediated flocculation
Linking allochthonous dissolved organic matter and boreal lake sediment carbon sequestration: The role of light‐mediated flocculation
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DOI：
10.4319/lo.2008.53.6.2416
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发表时间：
2008-11
影响因子：
4.5
通讯作者：
Eddie von Wachenfeldt;S. Sobek;D. Bastviken;L. Tranvik
中科院分区：
文献类型：
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作者：
Eddie von Wachenfeldt;S. Sobek;D. Bastviken;L. Tranvik
我们测量了溶解有机碳（DOC）在水中的絮凝从腐殖湖泊（DOC = 14.9毫克C L-1）和从附近的沼泽（DOC = 25.7毫克C L-1），在原位封闭实验与不同的光制度。光刺激有机颗粒的形成，在这两个沃茨，和有机颗粒的形成，观察到在所有的孵化深度，甚至在黑暗的控制。浮游植物生物量的生产是微不足道的，和外来DOC是最重要的前体下沉颗粒。湖泊和沼泽水中DOC的损失分别占8 - 22%和25 - 60%，可以通过絮凝来解释。基于围隔实验的深度综合絮凝为14.7 mg C m-2 d-1。在过去十年中，湖水DOC浓度和水的颜色一直在增加，沉积物捕集器研究表明，有机碳的总沉积也增加了。因此，外源DOC在光刺激下的絮凝作用是湖泊沉积物固碳的一个途径。
We measured flocculation of dissolved organic carbon (DOC) in the water from a humic lake (DOC = 14.9 mg C L‐1) and from an adjacent mire (DOC = 25.7 mg C L‐1), in in situ enclosure experiments with different light regimes. Light stimulated the formation of organic particles in both waters, and organic particle formation was observed at all incubation depths, even in the dark controls. Production of phytoplankton biomass was negligible, and allochthonous DOC was the most important precursor of the sinking particles. 8‐22% and 25‐ 60% of the loss of DOC in lake and mire water, respectively, could be accounted for by flocculation. Depthintegrated flocculation based on the enclosure experiments was 14.7 mg C m‐2 d‐1. Lake‐water DOC concentration and water color has been increasing during the last decade, and sediment trap studies show that gross sedimentation of organic carbon also increased. Thus flocculation of allochthonous DOC, stimulated by light, constitutes a pathway for the sequestration of carbon in lake sediments.