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Influence of Nitrogen Loading and Species Composition on the Carbon Balance of Grasslands
David A. Wedin and David Tilman
New Series, Vol. 274, No. 5293 (Dec. 6, 1996), pp. 1720-1723
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/2890955
Page Count: 4
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In a 12-year experimental study of nitrogen (N) deposition on Minnesota grasslands, plots dominated by native warm-season grasses shifted to low-diversity mixtures dominated by cool-season grasses at all but the lowest N addition rates. This shift was associated with decreased biomass carbon (C):N ratios, increased N mineralization, increased soil nitrate, high N losses, and low C storage. In addition, plots originally dominated by nonnative cool-season grasses retained little added N and stored little C, even at low N input rates. Thus, grasslands with high N retention and C storage rates were the most vulnerable to species losses and major shifts in C and N cycling.
Science © 1996 American Association for the Advancement of Science