نتایج جستجو برای: Grazing severity

تعداد نتایج: 167942  

Journal: :journal of rangeland science 2011
e. fakhimi m. mesdaghi gh.a. dianati tilaki m. tavan

grazing management plays an important role in the continuous and economicutilization of pastures. proper grazing management is a main factor for the accumulation ofplant litter which reduces soil erosion and increase the soil permeability to keep moremoisture in the soil. in current study, the effect of three different grazing intensities (low,moderate and high) along with the grazing gradient ...

Journal: :Ecology letters 2013
Brandon T Bestelmeyer Michael C Duniway Darren K James Laura M Burkett Kris M Havstad

Theoretical models predict that drylands can cross critical thresholds, but experimental manipulations to evaluate them are non-existent. We used a long-term (13-year) pulse-perturbation experiment featuring heavy grazing and shrub removal to determine if critical thresholds and their determinants can be demonstrated in Chihuahuan Desert grasslands. We asked if cover values or patch-size metric...

2010
Kirk W. Davies Jonathan D. Bates Tony J. Svejcar Chad S. Boyd

Livestock grazing potentially has substantial influence on fuel characteristics in rangelands around the globe. However, information quantifying the impacts of grazing on rangeland fuel characteristics is limited, and the effects of grazing on fuels are important because fuel characteristics are one of the primary factors determining risk, severity, continuity, and size of wildfires. We investi...

2006
RICHARD J. WILLIAMS WARREN J. MÜLLER

Alpine grazing reduces blazing’ is a widely and strongly held view concerning the effects of livestock grazing on fuels, and therefore fire behaviour and impact, in Australia’s high country landscapes. As a test of this hypothesis, we examined the patterns of burning across the alpine (treeless) landscapes of the Bogong High Plains in Victoria, following the extensive fires of January 2003. Dat...

2007
John Sakulich Alan H. Taylor

Fire is a key disturbance agent in the fire-prone mixed conifer and ponderosa pine forests of the southwestern United States. Human activities (i.e., livestock grazing, logging, and fire suppression) have resulted in the exclusion of fire from these forests for the past century and fire exclusion has caused changes in forest structure and composition. This study quantifies spatial and temporal ...

Journal: :New Phytologist 2021

Plant pathogens and their hosts often coexist with mammal grazers. However, the direction strength of grazing effects on foliar fungal diseases can be idiosyncratic, varying among host plant species pathogen types. We combined a 6 yr yak-grazing experiment, clipping experiment simulating different consumption patterns (leaf damage vs whole-leaf removal), meta-analysis 63 comparisons to evaluate...

Journal: :Environmental management 2014
Robert L Beschta Debra L Donahue Dominick A DellaSala Jonathan J Rhodes James R Karr Mary H O'Brien Thomas L Fleischner Cindy Deacon Williams

Svejcar et al. (Environ Manage, 2014) offered several perspectives regarding Beschta et al. (Environ Manage 51:474-491, 2013)--a publication that addressed the interacting ecological effects of climate change and domestic, wild, and feral ungulates on public lands in the western United States (US)--by largely focusing on three livestock grazing issues: (1) legacy versus current day impacts; (2)...

2009
Jonathan D. Bates Edward C. Rhodes Kirk W. Davies Robert Sharp

Prescribed fire in rangeland ecosystems is applied for a variety of management objectives, including enhancing productivity of forage species for domestic livestock. In the big sagebrush (Artemisia tridentata Nutt.) steppe of the western United States, fire has been a natural and prescribed disturbance, temporarily shifting vegetation from shrub–grass codominance to grass dominance. There is li...

Journal: :Journal of animal science 1983
T L Mader G W Horn W A Phillips R W McNew

The effect of feeding low quality roughages (LQR) on live and carcass weight gains and the incidence and severity of bloat of stocker cattle grazed on wheat pasture was evaluated in a 3 yr study. One hundred eighty-five steer calves (172 kg mean initial weight) grazed clean-tilled wheat pasture and were either fed no LQR or had ad libitum access to wheat straw (WS) or sorghum-Sudan hay (SS). Gr...

Journal: :Proceedings of the New Zealand Grassland Association 2005

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