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Invasive Grasses Increase Nitrogen Availability in California Grassland Soils

Published online by Cambridge University Press:  20 January 2017

Sophie S. Parker*
Affiliation:
Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA 93106
Joshua P. Schimel
Affiliation:
Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA 93106
*
Corresponding author's E-mail: [email protected]
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Abstract

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As Europeans colonized California, they introduced annual grasses from the Mediterranean Basin. These exotic annual grasses eventually invaded grasslands throughout the state, some of which were once dominated by native perennial grass species. Annual grasses differ from perennials in their phenology, longevity, rooting depth, litter chemistry, and interaction with the microbial community. As these traits may influence plant nitrogen (N) use, it is likely that the invasion by annual species resulted in changes in the availability and cycling of N in California grassland systems. We addressed the question of how invasive annual grasses influence rates of N cycling by measuring N pool sizes and rates of net and gross mineralization and nitrification, gross immobilization, and the denitrification potential of soils from experimentally planted annual and perennial-dominated grasslands. With an increase in annual grass cover, we saw increases in ammonium (NH4+) pool sizes and rates of N mineralization, nitrification, and denitrification in soils. These differences in N status suggest that N cycling in California grasslands was altered at sites where native perennial bunchgrasses were invaded by nonnative annual grasses. One consequence of annual grass invasion may be a legacy of NH4+-enriched soils that hinder the reestablishment of native perennial grass species.

Type
Research
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Weed Science Society of America

Footnotes

Current address: Ecoregional Ecologist, The Nature Conservancy, 523 W. Sixth St., Suite 1216, Los Angeles, CA 90014

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