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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Smith, M-l Reich, P. B. Oren, R. Bolstad, P. V. Cook, B. D. Day, M. C. Richardson, A. D. Martin, T. A. Monson, R. K. Schmid, H. P. Martin, M. E. Frolking, S. E. Munger, J. W. Paw, U. K. T. Hollinger, D. Y. Ollinger, S. V. Katul, G. G. Plourde, L. C. |
| Description | Author Affiliation: Ollinger SV ( Complex Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH 03824, USA. scott.ollinger@unh.edu); |
| Abstract | The availability of nitrogen represents a key constraint on carbon cycling in terrestrial ecosystems, and it is largely in this capacity that the role of N in the Earth's climate system has been considered. Despite this, few studies have included continuous variation in plant N status as a driver of broad-scale carbon cycle analyses. This is partly because of uncertainties in how leaf-level physiological relationships scale to whole ecosystems and because methods for regional to continental detection of plant N concentrations have yet to be developed. Here, we show that ecosystem CO(2) uptake capacity in temperate and boreal forests scales directly with whole-canopy N concentrations, mirroring a leaf-level trend that has been observed for woody plants worldwide. We further show that both CO(2) uptake capacity and canopy N concentration are strongly and positively correlated with shortwave surface albedo. These results suggest that N plays an additional, and overlooked, role in the climate system via its influence on vegetation reflectivity and shortwave surface energy exchange. We also demonstrate that much of the spatial variation in canopy N can be detected by using broad-band satellite sensors, offering a means through which these findings can be applied toward improved application of coupled carbon cycle-climate models. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 49 |
| Volume Number | 105 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2008-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Metabolism Climate Ecosystem Nitrogen Environmental Monitoring Models, Biological Spacecraft Temperature Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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