نتایج جستجو برای: grassland

تعداد نتایج: 10371  

2013
Clinton Innes Madhur Anand Chris T. Bauch

Forest-grassland mosaic ecosystems can exhibit alternative stables states, whereby under the same environmental conditions, the ecosystem could equally well reside either in one state or another, depending on the initial conditions. We develop a mathematical model that couples a simplified forest-grassland mosaic model to a dynamic model of opinions about conservation priorities in a population...

2015
Sara A. O. Cousins Alistair G. Auffret Jessica Lindgren Louise Tränk

Extensive changes in land cover during the 20th century are known to have had detrimental effects on biodiversity in rural landscapes, but the magnitude of change and their ecological effects are not well known on regional scales. We digitized historical maps from the beginning of the 20th century over a 1652 km(2) study area in southeastern Sweden, comparing it to modern-day land cover with a ...

2015
Steffen A. Adler Stig Purup Jens Hansen-Møller Erling Thuen Håvard Steinshamn Gabriele Berg

Phytoestrogens have structures similar to endogenous steroids and may induce or inhibit the response of hormone receptors. The objectives of the present study were to compare the effects of long-term vs. short-term grassland management in organic and conventional dairy production systems, compare organic and conventional production systems and assess seasonal variation on phytoestrogen concentr...

2016
Katherine A. Orford Phil J. Murray Ian P. Vaughan Jane Memmott

Grassland for livestock production is a major form of land use throughout Europe and its intensive management threatens biodiversity and ecosystem functioning in agricultural landscapes. Modest increases to conventional grassland biodiversity could have considerable positive impacts on the provision of ecosystem services, such as pollination, to surrounding habitats.Using a field-scale experime...

Journal: :Remote Sensing 2017
Baoping Meng Jing Ge Tiangang Liang Shuxia Yang Jinglong Gao Qisheng Feng Xia Cui Xiaodong Huang Hongjie Xie

It is not yet clear whether there is any difference in using remote sensing data of different spatial resolutions and filtering methods to improve the above-ground biomass (AGB) estimation accuracy of alpine meadow grassland. In this study, field measurements of AGB and spectral data at Sangke Town, Gansu Province, China, in three years (2013–2015) are combined to construct AGB estimation model...

2016
Tianjie Lei Zhiguo Pang Xingyong Wang Lin Li Guangyuan Kan Xiaolei Zhang Liuqian Ding Jiren Li Shifeng Huang Changliang Shao Jun Xu

In recent years, the increased intensity and duration of droughts have dramatically altered the structure and function of grassland ecosystems, which have been forced to adapt to this change in climate. Combinations of global change drivers such as elevated atmospheric CO2 concentration, warming, nitrogen (N) deposition, grazing, and land-use change have influenced the impact that droughts have...

2013
Liang Yan Guangsheng Zhou Feng Zhang

BACKGROUND Grazing is one of the main grassland disturbances in China, and it is essential to quantitatively evaluate the effects of different grazing intensities on grassland production for grassland carbon budget and sustainable use. METHODS A meta-analysis was conducted to reveal general response patterns of grassland production to grazing in China. We used weighted log response ratio to a...

Journal: :Journal of environmental management 2007
Wen Jun Li Saleem H Ali Qian Zhang

The semi-private property rights arrangement called the Household Production Responsibility System (HPRS) was started in the early 1980s in Xilingol pasture of Inner Mongolia (China), and stimulated the development of stockbreeding. The grassland has been degrading severely with increasing numbers of livestock. Based on a historical review of property rights regimes in Inner Mongolia and empiri...

2018
Hasbagan Ganjurjav Guozheng Hu Yunfan Wan Yue Li Luobu Danjiu Qingzhu Gao

Climate is a driver of terrestrial ecosystem carbon exchange, which is an important product of ecosystem function. The Qinghai-Tibetan Plateau has recently been subjected to a marked increase in temperature as a consequence of global warming. To explore the effects of warming on carbon exchange in grassland ecosystems, we conducted a whole-year warming experiment between 2012 and 2014 using ope...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2009
Corina J Rahmig William E Jensen Kimberly A With

Extensive habitat loss and changing agricultural practices have caused widespread declines in grassland birds throughout North America. The Flint Hills of Kansas and Oklahoma--the largest remaining tallgrass prairie--is important for grassland bird conservation despite supporting a major cattle industry. In 2004 and 2005, we assessed the community, population, and demographic responses of grass...

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