251acid- neutralizing capacities because it is not often measured in soils; and (4) how
the interactions of these soil factors are expected to change among regions as climates
fl uctuate and type, intensity, and timing of surface disturbances change. The latter is
increasingly important with future moisture and temperature changes, and if our
hypothesis is correct, large changes in Bromus distributions could occur. In addi-
tion, soils in many areas of the Western USA are unmapped or maps are inadequate
for this purpose. Therefore, more effort is needed in this arena as well.
Acknowledgments Funding for JB was provided by USGS Ecosystems and the Climate and
Land Use Program and for EA, the National Park Service PMIS No. 72123 and National Science
Foundation DEB 04-21530. Patti Haggerty helped with graphics. Any use of trade names is for
descriptive purposes only and does not imply endorsement by the US government.
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8 Soil Moisture and Biogeochemical Factors Infl uence the Distribution of Annual...