نتایج جستجو برای: continued grazing

تعداد نتایج: 94724  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Joern Fischer Jenny Stott Andre Zerger Garth Warren Kate Sherren Robert I Forrester

Global food demand is growing rapidly. Livestock grazing can provide a valuable source of protein, but conventional grazing is often unsustainable. We studied an 800,000-ha section of a threatened ecoregion in southeastern Australia. Conventional management in the region involves continuous livestock grazing with few rest periods and regular fertilizer application. By using remotely sensed data...

2018
Shiming Tang Yujuan Zhang Xiajie Zhai Andreas Wilkes Chengjie Wang Kun Wang

BACKGROUND The effects of grazing on soil methane (CH4) uptake in steppe ecosystems are important for understanding carbon sequestration and cycling because the role of grassland soil for CH4 uptake can have major impacts at the global level. Here, a meta-analysis of 27 individual studies was carried out to assess the response patterns of soil CH4 uptake to grazing in steppe ecosystems of China...

Journal: :Journal of animal science 2015
M B Chiavegato J E Rowntree W J Powers

Greenhouse gas (GHG) fluxes and soil organic carbon (SOC) accumulation in grassland ecosystems are intimately linked to grazing management. This study assessed the carbon equivalent flux (Ceq) from 1) an irrigated, heavily stocked, low-density grazing system, 2) a nonirrigated, lightly stocked, high-density grazing system, and 3) a grazing-exclusion pasture site on the basis of the GHG emission...

جعفری, فرهنگ , زارع‌کیا, صدیقه, غلامی, پرویز , فیاض, محمد, گودرزی, محمود ,

Livestock grazing is a common human-induced activity with direct and indirect effects even on the ecosystems of protected areas. The present study analyzed the effects of different grazing management methods on species diversity and richness in the steppe rangelands of Saveh, Iran. Data were collected from sixty 2×2 m plots within the areas of three, four-years protected range management projec...

Journal: :desert 2008
n. baghestani-maybodi m. jankju-borzelabad m. taghi zare

one of the key factors in managing a rangeland is to determine the relative preference of its major plant species by thegrazing livestock. preference value of each plant species is affected by plant type, companion plants, availability byanimals, phenological stage, climate condition, and the livestock species. we investigated the grazing behaviour of anative goat (garizi) in the steppe rangela...

Spiny and aromatic species in rangelands can play important role in the conservation of plant species in rangelands; however, few studies  have been done on the role of these plants under different levels of livestock grazing. In this research, the facilitation effects of spiny (Astragalus chrysostachys Boiss) and aromatic (Artemisia kopetdaghensis (Poljakov) Y.R.Ling) shrubs were studied on sp...

2009
Jaime Kigel

Question: Is the assumption of trait independence implied in Westoby’s (1998) leaf-height-seed (LHS) ecology strategy scheme upheld in a Mediterranean grazing system dominated by annuals? Is the LHS approach applicable at the community level? Location: Northern Israel. Methods: LHS traits (specific leaf area [SLA], plant height and seed mass), and additional leaf traits (leaf dry matter content...

Journal: :Animal : an international journal of animal bioscience 2014
C M Wims L Delaby T M Boland M O'Donovan

A grazing study was undertaken to examine the effect of maintaining three levels of pre-grazing herbage mass (HM) on dairy cow performance, grass dry matter (DM) production and output from perennial ryegrass (Lolium perenne L.) pastures. Cows were randomly assigned to one of three pre-grazing HM treatments: 1150 - Low HM (L), 1400 - Medium HM (M) or 2000 kg DM/ha - High HM (H). Herbage accumula...

Journal: :Biological reviews of the Cambridge Philosophical Society 2015
Gareth P Hempson Sally Archibald William J Bond Roger P Ellis Cornelia C Grant Fred J Kruger Laurence M Kruger Courtney Moxley Norman Owen-Smith Mike J S Peel Izak P J Smit Karen J Vickers

Grazing lawns are a distinct grassland community type, characterised by short-stature and with their persistence and spread promoted by grazing. In Africa, they reveal a long co-evolutionary history of grasses and large mammal grazers. The attractiveness to grazers of a low-biomass sward lies in the relatively high quality of forage, largely due to the low proportion of stem material in the swa...

2015
Hui Zhu Deli Wang Qinfeng Guo Jun Liu Ling Wang

The structure and dynamics of insect community in grasslands can be influenced by grazing management via altered characteristics of plant community. However, attempts to better understand the complex relationships among plants, insects, and large herbivores is still hampered largely by the interactive effects of plants, insects, and large grazers on each other. In this study, we test the hypoth...

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