Exchange of N2O and CH4 between the atmosphere and soils in spruce-fir forests in the northeastern United States |
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| Authors: | Mark S Castro Paul A Steudler Jerry M Melillo John D Aber Sarah Millham |
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| Institution: | (1) The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA;(2) Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, New Hampshire 03824, USA;(3) Goddard Space Flight Center, Greenbelt, Maryland 20771, USA |
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| Abstract: | We measured the exchange of N2O and CH4 between the atmosphere and soils in 5 spruce-fir stands located along a transect from New York to Maine. Nitrous oxide emissions
averaged over the 1990 growing season (May–September) ranged from 2.1 ug N2O-N/m2-hr in New York to 0.4 ug N2O-N/m2-hr in Maine. The westernmost sites, Whiteface Mtn., New York and Mt. Mansfield, Vermont, had the highest nitrogen-deposition,
net nitrification and N2O emissions. Soils at all sites were net sinks for atmospheric CH4 Methane uptake averaged over the 1990 growing season ranged from 0.02 mg CH4-C/M2-hr in Maine to 0.05 mg CH4-C/m2-hr in Vermont. Regional differences in CH4 uptake could not be explained by differences in nitrogen-deposition, soil nitrogen dynamics, soil moisture or soil temperature.
We estimate that soils in spruce-fir forests at our study sites released ca. 0.02 to 0.08 kg N2O-N/ha and consumed ca. 0.74 to 1.85 kg CH4 C/ha in the 1990 growing season. |
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| Keywords: | N2O CH4 red spruce balsam fir spruce-fir forests nitrogen deposition nitrification mineralization denitrification |
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