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Establishment Stage Competition between Exotic Crimson Fountaingrass (Pennisetum setaceum, C4) and Native Purple Needlegrass (Stipa pulchra, C3)

Published online by Cambridge University Press:  20 January 2017

Lynn C. Sweet  and
Jodie S. Holt
Lynn C. Sweet*
Affiliation:
Bren School of Environmental Science and Management, University of California, Santa Barbara, Santa Barbara, CA 93106
Jodie S. Holt
Affiliation:
Agriculture and Natural Resources, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA 92521
*
Corresponding author's E-mail: lsweet@bren.ucsb.edu
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Abstract

Southern California grasslands have largely been type-converted to dominance by exotic annual grasses, leading to displacement of many native grass and forb species. Crimson fountaingrass, Pennisetum setaceum, an exotic perennial C4 species and a relatively new invader to California, is expanding to areas currently occupied by purple needlegrass, Stipa pulchra, a C3 native. We predicted that fountaingrass seedlings might withstand cool season competition in California's Mediterranean-type climate and establish in Stipa pulchra grasslands due to less competition during the warm, dry summer season, and that interactions might be influenced by density. A field experiment was conducted to examine competitive interactions of the two species from the cool winter season to the warm summer season. As predicted, Stipa produced greater aboveground biomass in the cool season and showed strong intraspecific competition, as well as interspecific suppression of Pennisetum growth, whereas Pennisetum showed no suppression of Stipa. In the warm season, Stipa showed relatively less suppression of Pennisetum, erasing significant differences, and Pennisetum showed increased growth. Results of this study show that C3Stipa can suppress initial growth of C4Pennisetum in the cool season, but in warmer months, Pennisetum can overcome this initial suppression at both low and high densities, even within a Mediterranean-type climate with little to no summer rainfall. Thus, in southern California, temporal niche partitioning due to photosynthetic pathway in these two species can allow Pennisetum invasion. Given the similarity in life history and growth form of Stipa and Pennisetum, few options exist for controlling Pennisetum in habitats where Stipa occurs. In these cases, restoration plantings of desirable species are essential in order to reestablish competitive vegetation that will be more resistant to invasion.

Keywords

Crimson fountaingrass, Pennisetum setaceum (Forsk.) Chiov.purple needlegrass Stipa pulchra Hitchc. (synonym, Nassella pulchra (Hitchc.) Barkworth)Competitioncrimson fountaingrassestablishmentinvasive plantsplant ecologypurple needlegrass
Type
Research Article
Information
Invasive Plant Science and Management , Volume 8 , Issue 2 , June 2015 , pp. 139 - 150
Copyright
Copyright © Weed Science Society of America 

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