Submitted to: Ecological Society of America Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: July 15, 2008
Publication Date: August 3, 2008
Citation: Tartowski, S.L., James, D.K. 2008. Multiple constraints on ecological restoration: Re-establishment of black grama grass (Bouteloua eriopoda) after intensive grazing [abstract]. Ecological Society of America Abstracts. Paper No. COS 119-7. Technical Abstract: Climate change may alter potential ecological restoration of semi-arid rangeland. Bouteloua eriopoda (black grama, BOER) is a perennial C4 grass that usually fails to re-establish in degraded rangeland and may be constrained by increased atmospheric CO2 and reduced or seasonally redistributed rainfall. Eighteen contiguous 0.5-ha plots were established in a remnant black grama grassland at the Jornada Experimental Range in the Northern Chihuahuan Desert. Removal of mesquite shrubs (Prosopis glandulosa) and intensive seasonal grazing (none, winter, summer) were applied in a randomized complete block design. From 1996-2000 annual grazing removed 65-85% of the available forage in 24-36 h, a grazing intensity 30X greater than in the previous 40 years. In 2002 the mean percent cover of BOER was 5.82±0.94 in grazed plots compared to 27.3±1.33 in ungrazed plots. By 2005 BOER had not re-established. A pair of circular 1 m diameter, 6.35 mm wire mesh exclosures, were randomly located in each of the 18 plots. Annually from 2005-2007 the treatment exclosure of each pair had non-BOER above-ground biomass removed and viable BOER seed planted and fertilized.