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Soil water dynamics differ among rangeland plant communities dominated by yellow starthistle (Centaurea solstitialis), annual grasses, or perennial grasses

Published online by Cambridge University Press:  20 January 2017

Stephen F. Enloe ,
Joseph M. DiTomaso ,
Steve B. Orloff  and
Daniel J. Drake
Joseph M. DiTomaso
Affiliation:
Department of Vegetable Crops, University of California, Davis, CA 95616
Steve B. Orloff
Affiliation:
University of California Cooperative Extension, Yreka, CA 96097
Daniel J. Drake
Affiliation:
University of California Cooperative Extension, Yreka, CA 96097
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Abstract

California's interior grasslands have undergone dramatic changes during the last two centuries. Changes in land-use patterns and plant introductions after European contact and settlement resulted in the conversion of perennial-dominated grasslands to exotic annual grasses. More recently, the annual grasslands have been heavily invaded by the deeply rooted late-maturing forb yellow starthistle. This series of invasions and conversions has changed the community structure and phenology of the grasslands. We hypothesized that these changes have resulted in significant differences in soil water–use patterns in the grasslands. We studied soil water depletion and recharge patterns of three grassland community types dominated by perennial grasses, annual grasses, or yellow starthistle with contrasting phenology and rooting depths for 4 yr. Soil moisture measurements were taken every month from March to December in 1998, 1999, and 2000 and every other month in 2001. Measurements were taken with a neutron probe at depths of 30 to 150 cm at 30-cm intervals. The results indicate that the yellow starthistle community maintained a significantly drier soil profile than the annual grass community. The perennial grass community maintained an intermediate soil water content that was not significantly different from either of the other two communities. Significant time by community and depth by community interactions indicated that the yellow starthistle community continued depleting soil moisture later into the season and at deeper depths than the other grass communities. This study demonstrates the effect of plant invasion on soil water recharge and depletion patterns in California grasslands.

Keywords

Yellow starthistle, Centaurea solstitialis L. CENSOCalifornia annual grasslandsecosystem changesplant invasions
Type
Weed Biology and Ecology
Information
Weed Science , Volume 52 , Issue 6 , December 2004 , pp. 929 - 935
Copyright
Copyright © Weed Science Society of America 

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