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
Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA.
Science. 2003 Nov 28;302(5650):1554-7. doi: 10.1126/science.1091165.
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.
通过涡度协方差方法，对巴西圣塔伦附近两个老龄森林站点的二氧化碳净生态系统交换进行了为期3年的测量。在雨季碳流失，旱季碳增加，这与树木生长的季节周期和模型预测均相反。3年平均碳损失为每年每公顷1.3（置信区间：0.0至2.0）兆克碳。生物特征观测证实了净损失，但表明这是近期干扰叠加在长期平衡上的一种短暂效应。鉴于老龄森林具有间歇性干扰的特征，其碳固存可能低于从近期对未受干扰站点的涡度协方差研究中推断出的水平。
