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No Long-Term Effects of Prescribed Fire on Lehmann Lovegrass (Eragrostis lehmanniana)–Invaded Desert Grassland

Author:
McGlone, Christopher M.
Source:
Invasive plant science and management 2013 v.6 no.3 pp. 449-456
ISSN:
1939-747X
Subject:
Bouteloua eriopoda, Eragrostis lehmanniana, Gutierrezia sarothrae, grasses, grasslands, indigenous species, invasive species, prescribed burning, shrubs, woody plants, Chihuahuan Desert
Abstract:
Desert grasslands of the southwestern United States have experienced an increase in the abundance and distribution of woody plant species over the past century. Shrub encroachment has caused a substantial loss of grasslands in the northern Chihuahuan Desert. The Chihuahuan Desert has also been invaded by Lehmann lovegrass, a fire-adapted species from southern Africa. In 1999, the U.S. Department of Agriculture–Agricultural Research Service burned a remnant desert grassland to determine the effects of prescribed fire on shrub–perennial grass dynamics. The grassland also contained the nonnative perennial grass Lehmann lovegrass. I am reporting on a study that was initiated to determine whether prescribed burning would alter the vegetative community within and proximal to a Lehmann lovegrass–dominated patch. Cover of Lehmann lovegrass showed no significant response to the burn treatment. Of the dominant native species, only black grama and broom snakeweed had a significant year by treatment interaction. No species or growth form had a significant vegetation type by year by treatment interaction. After 6 yr, differences between burned and unburned transects were not significant for any species or growth form. Nomenclature: Lehmann lovegrass, Eragrostis lehmanniana Nees, black grama, Bouteloua eriopoda (Torr.) Torr., broom snakeweed, Gutierrezia sarothrae (Pursh) Britt. & Rusby.
Agid:
1280135