کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4394271 1305527 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Does fall prescribed burning Artemisia tridentata steppe promote invasion or resistance to invasion after a recovery period?
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Does fall prescribed burning Artemisia tridentata steppe promote invasion or resistance to invasion after a recovery period?
چکیده انگلیسی

Artemisia tridentata ssp. wyomingensis (Beetle & A. Young) S.L. Welsh-bunchgrass communities were used to analyze the influence of disturbances on invasibility after a recovery period. These communities evolved with periodic fires shifting dominance from shrubs to herbaceous species. However, fire can facilitate Bromus tectorum L. invasion of these plant communities. We evaluated the invasibility of A. tridentata ssp. wyomingensis-bunchgrass communities 4 years after prescribed fall burning at six sites by comparing burned to unburned (control) communities. These communities did not have B. tectorum present prior to introduction. B. tectorum was introduced at 1, 10, 100, 1000, and 10,000 seeds m−2 in burned and unburned communities. B. tectorum individuals established only when introduced at 10,000 seeds m−2. In the areas seeded at 10,000 seeds m−2, B. tectorum density and cover were more than three-fold higher in the control than burned treatments (P=0.04 and 0.08, respectively). Total herbaceous vegetation cover, density, and production increased with burning (P<0.01, 0.02, and <0.01, respectively). Bare ground and inorganic nitrogen were higher in the control than the burned treatment (P=0.02 and <0.01, respectively). Prescribed fall burning of late seral A. tridentata ssp. wyomingensis-bunchgrass communities stimulated the herbaceous component and increased the resistance of the communities to B. tectorum invasion 4 years post-burn. However, we do not suggest the use of prescribed burning in communities where invasive annual grasses are present or in close proximity. We acknowledge that our results would probably have been drastically different if B. tectorum or other invasive annual grasses had been a component of the plant communities prior to prescribed burning or became a component immediately after burning.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Arid Environments - Volume 72, Issue 6, June 2008, Pages 1076–1085
نویسندگان
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