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Science 15 March 1996:
Vol. 271. no. 5255, pp. 1576 - 1578
DOI: 10.1126/science.271.5255.1576
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Reports
Exchange of Carbon Dioxide by a Deciduous Forest:
Response to Interannual Climate Variability
Michael L. Goulden,
J. William Munger,
Song-Miao Fan,
Bruce C. Daube,
Steven C. Wofsy
*
The annual net uptake of CO2 by a deciduous forest in
New England varied from 1.4 to 2.8 metric tons of carbon per
hectare between 1991 and 1995. Carbon sequestration was
higher than average in 1991 because of increased photosynthesis and in
1995 because of decreased respiration. Interannual shifts in
photosynthesis were associated with the timing of leaf expansion and
senescence. Shifts in annual respiration were associated with anomalies
in soil temperature, deep snow in winter, and drought in summer. If
this ecosystem is typical of northern biomes, interannual climate
variations on seasonal time scales may modify annual CO2
exchange in the Northern Hemisphere by 1 gigaton of carbon or more each
year.
Division of Applied Sciences and Department of Earth and Planetary
Sciences, Harvard University, Cambridge, MA 02138, USA.
*
To whom correspondence should be addressed.
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