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Carbon in Amazon forests: unexpected seasonal fluxes and disturbance-induced losses |
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| Authors: | Saleska Scott R Miller Scott D Matross Daniel M Goulden Michael L Wofsy Steven C da Rocha Humberto R de Camargo Plinio B Crill Patrick Daube Bruce C de Freitas Helber C Hutyra Lucy Keller Michael Kirchhoff Volker Menton Mary Munger J William Pyle Elizabeth Hammond Rice Amy H Silva Hudson |
| Institution: | Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. saleska@fas.harvard.edu |
| Abstract: | The net ecosystem exchange of carbon dioxide was measured by eddy covariance methods for 3 years in two old-growth forest sites near Santarém, Brazil. Carbon was lost in the wet season and gained in the dry season, which was opposite to the seasonal cycles of both tree growth and model predictions. The 3-year average carbon loss was 1.3 (confidence interval: 0.0 to 2.0) megagrams of carbon per hectare per year. Biometric observations confirmed the net loss but imply that it is a transient effect of recent disturbance superimposed on long-term balance. Given that episodic disturbances are characteristic of old-growth forests, it is likely that carbon sequestration is lower than has been inferred from recent eddy covariance studies at undisturbed sites. |
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