Energy and trace-gas fluxes across a soil pH boundary in the Arctic

D. A. Walker (), N. A. Auerbach, J. G. Bockheim, F. S. Chapin, W. Eugster, J. Y. King, J. P. McFadden, G. J. Michaelson, F. E. Nelson, W. C. Oechel, C. L. Ping, W. S. Reeburg, S. Regli, N. I. Shiklomanov and G. L. Vourlitis
Additional contact information
D. A. Walker: Tundra Ecosystem Analysis and Mapping Laboratory, Institute of Arctic and Alpine Research, University of Colorado
N. A. Auerbach: Tundra Ecosystem Analysis and Mapping Laboratory, Institute of Arctic and Alpine Research, University of Colorado
J. G. Bockheim: University of Wisconsin
F. S. Chapin: University of California Berkeley
W. Eugster: University of California Berkeley
J. Y. King: University of California Irvine
J. P. McFadden: University of California Berkeley
G. J. Michaelson: Agricultural and Forestry Exploratory Station, University of Alaska Fairbanks
F. E. Nelson: University of Delaware
W. C. Oechel: Global Change Research Group, San Diego State University
C. L. Ping: Agricultural and Forestry Exploratory Station, University of Alaska Fairbanks
W. S. Reeburg: University of California Irvine
S. Regli: University of California Irvine
N. I. Shiklomanov: University of Delaware
G. L. Vourlitis: Global Change Research Group, San Diego State University

Nature, 1998, vol. 394, issue 6692, 469-472

Abstract: Abstract Studies and models of trace-gas flux in the Arctic consider temperature and moisture to be the dominant controls over land–atmosphere exchange1,2, with little attention having been paid to the effects of different substrates. Likewise, current Arctic vegetation maps for models of vegetation change recognize one or two tundra types3,4 and do not portray the extensive regions with different soils within the Arctic. Here we show that rapid changes to ecosystem processes (such as photosynthesis and respiration) that are related to changes in climate and land usage will be superimposed upon and modulated by differences in substrate pH. A sharp soil pH boundary along the northern front of the Arctic Foothills in Alaska separates non-acidic (pH > 6.5) ecosystems to the north from predominantly acidic (pH

Date: 1998
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DOI: 10.1038/28839

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