نتایج جستجو برای: grazing unauthorized livestock

تعداد نتایج: 39687  

2008
Dirk H. Van Vuren Michael L. Johnson Lizabeth Bowen

We assessed the effects of overgrazing by feral sheep on watersheds on Santa Cruz Island, California. Overgrazing had a marked effect on stream flow; flows were much greater in overgrazed than in lightly grazed watersheds early in the rainy season, but the difference vanished later in the season. This pattern can be explained by reduced infiltration and increased surface runoff of rainfall in o...

2011
Wei Li Hai-Zhou Huang Zhi-Nan Zhang Gao-Lin Wu

Livestock grazing is one of the most important factors influencing the above-ground community composition and structure in a natural grassland ecosystem. Different grazing intensities also have the potential to alter soil C and N storage substantially in grasslands. We conducted a field community study and soil analyses to determine the effects of different grazing intensities on the above-grou...

2015
watersheds Tate

We conducted a 5-year study on the impact of nutrients, depending on stream and season. grazing on stream-channel bare ground and erosion, and a © CSA 3-year study of cattle-trail erosion on intermittent stream channels draining grazed oak (Quercus)-woodland 450. Correlations of stocking with the cryptogamic soil watersheds. These studies were conducted on the San crust of a semi-arid rangeland...

2008
A. R. Tiedemann D. A. Higgins T. M. Quigley H. R. Sanderson D. B. Marx

Concentrations and loadings (output, number day-' km-2) of fecal coliform (FC) indicator bacteria were measured from 1979 through 1984 in streamflow from 13 forested watersheds under the following range management strategies: (A) no grazing; (B) grazing without management for livestock distribution; (C) grazing with management to obtain livestock distribution, and (ID) grazing with management t...

2015
Luis Beltrán Epele María Laura Miserendino Wenju Liang

Livestock grazing can compromise the biotic integrity and health of wetlands, especially in remotes areas like Patagonia, which provide habitat for several endemic terrestrial and aquatic species. Understanding the effects of these land use practices on invertebrate communities can help prevent the deterioration of wetlands and provide insights for restoration. In this contribution, we assessed...

2006
Temuulen Tsagaan Sankey Cliff Montagne Lisa Graumlich Rick Lawrence Jerry Nielsen

We studied 20th century lower forest–grassland ecotone shift in the Centennial Valley in southwestern Montana and investigated the effects of livestock herbivory on ecotone shift at a local spatial scale and a decadal time scale. A total of 525 aspen (Populus tremuloides) and 1703 Douglasfir (Pseudotsuga menziesii) trees were cored and 10,168 saplings were mapped along the ecotone at five sites...

Journal: :مرتع و آبخیزداری 0
قادر کریمی عضو هیئت علمی مؤسسة تحقیقات جنگل ها و مراتع کشور حسن یگانه استادیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان معصومه عباسی خالکی دانشجوی دکتری دانشگاه محقق اردبیلی مهدی معمری دانشجوی دکتری مرتع داری دانشکدة منابع طبیعی دانشگاه تهران هادی افرا کارشناس ارشد دانشگاه علوم کشاورزی و منابع طبیعی گرگان

to evaluate the vegetative and productive characteristics and forage utilization by livestock at different stages of bromus tomentellus boiss.phonology, this experiment was carried out during five years in kordan rangeland of alborz province rangelands. so starting the grazing season and livestock entering, any remaining amount of forage grazing was harvested until a month intervals, and utiliz...

Rangelands cover approximately 85% of Kenya’s land mass and is a major resource for livestock farming with a considerable potential to mitigate climate change, yet these lands are stressed differently by various management. Our study aimed at determining the influence of grazing management systems (rotational, continuous and ungrazed) on soil organic carbon stocks in Yoani ranch located in the ...

Intense grazing of rangeland is one of the most important factors affecting rangeland degradation, which causes soil compaction, increased runoff, weakening and degradation of vegetation, and changes in rangeland species composition, and ultimately affects forage and livestock production. The present study was conducted to investigate the different intensities of cattle and sheep grazing and in...

Journal: :Environmental management 2014
Matthew R Freitas Leslie M Roche Dave Weixelman Kenneth W Tate

We examined long-term (10 years) meadow plant community responses to (1) livestock grazing under riparian grazing utilization limits; (2) suspension of livestock grazing; and (3) meadow site wetness and precipitation on the Inyo National Forest, California. Observed trends in meadow plant species richness, diversity, and frequency of soil stabilizing species were not significantly different bet...

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