Biophysical controls on organic carbon fluxes in fluvial networks
Biophysical controls on organic carbon fluxes in fluvial networks
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DOI：
10.1038/ngeo101
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发表时间：
2008-02-01
影响因子：
18.3
通讯作者：
Sabater, Francesc
中科院分区：
文献类型：
--
作者：
Battin, Tom J.;Kaplan, Louis A.;Sabater, Francesc
陆地有机碳在淡水生态系统中的代谢是导致大量二氧化碳释放到大气中的原因，这与陆地有机碳是不可吸收的并且对水生代谢的支持作用很小的传统观点相矛盾。在这里，我们结合联合收割机最近的研究结果，从地球物理学，微生物生态学和有机地球化学，以显示地球物理的机会和微生物的能力，以提高净异养在溪流，河流和河口。我们确定水文存储和保留区，延长有机碳在下游运输过程中的停留时间，作为微生物发展为附着生物膜或悬浮聚集体的地球物理机会，并代谢有机碳以获得能量和生长。我们认为河流网络作为元生态系统，包括下游生态系统中的微生物群落的驯化，使他们能够利用从上游生态系统逃逸的能量，从而提高网络水平的整体能源利用率。
Metabolism of terrestrial organic carbon in freshwater ecosystems is responsible for a large amount of carbon dioxide outgassing to the atmosphere, in contradiction to the conventional wisdom that terrestrial organic carbon is recalcitrant and contributes little to the support of aquatic metabolism. Here, we combine recent findings from geophysics, microbial ecology and organic geochemistry to show geophysical opportunity and microbial capacity to enhance the net heterotrophy in streams, rivers and estuaries. We identify hydrological storage and retention zones that extend the residence time of organic carbon during downstream transport as geophysical opportunities for microorganisms to develop as attached biofilms or suspended aggregates, and to metabolize organic carbon for energy and growth. We consider fluvial networks as meta-ecosystems to include the acclimation of microbial communities in downstream ecosystems that enable them to exploit energy that escapes from upstream ecosystems, thereby increasing the overall energy utilization at the network level.