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Plumbing the global carbon cycle: Integrating inland waters into the terrestrial carbon budget

Cole, J. and Prairie, Y.T. and Caraco, N. and McDowell, W.H. and Tranvil, L. and Striegl, R.G. and Duarte, C.M. and Kortelainen, P. and Downing, J.A. and Middelburg, J.J. and Melack, J. (2007) Plumbing the global carbon cycle: Integrating inland waters into the terrestrial carbon budget. Ecosystems, 10, 172-185. ISSN 1432-9840.

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Official URL: http://dx.doi.org/10.1007/s10021-006-9013-8

Abstract

Because freshwater covers such a small fraction of the Earth’s surface area, inland freshwater ecosystems (particularly lakes, rivers, and reservoirs) have rarely been considered as potentially important quantitative components of the carbon cycle at either global or regional scales. By taking published estimates of gas exchange, sediment accumulation, and carbon transport for a variety of aquatic systems, we have constructed a budget for the role of inland water ecosystems in the global carbon cycle. Our analysis conservatively estimates that inland waters annually receive, from a combination of background and anthropogenically altered sources, on the order of 1.9 Pg C y−1 from the terrestrial landscape, of which about 0.2 is buried in aquatic sediments, at least 0.8 (possibly much more) is returned to the atmosphere as gas exchange while the remaining 0.9 Pg y−1 is delivered to the oceans, roughly equally as inorganic and organic carbon. Thus, roughly twice as much C enters inland aquatic systems from land as is exported from land to the sea. Over prolonged time net carbon fluxes in aquatic systems tend to be greater per unit area than in much of the surrounding land. Although their area is small, these freshwater aquatic systems can affect regional C balances. Further, the inclusion of inland, freshwater ecosystems provides useful insight about the storage, oxidation and transport of terrestrial C, and may warrant a revision of how the modern net C sink on land is described.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:4488
Deposited On:15 Sep 2009 02:00
Last Modified:24 Apr 2012 16:49

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