نتایج جستجو برای: grassland

تعداد نتایج: 10371  

Journal: :journal of rangeland science 0
bayarmaa enkhbayar

introduction the challenges related to the preservation of mongolia’s pastureland, its quality and condition are key concerns for the livestock sector. however, scientists, researchers and government agencies tend to focus solely on rangeland ecology and livestock. all too often, herders are overlooked and omitted from the discourse. this is the main reason i want to talk about people of the mo...

2014
Peter J. Blank David W. Sample Carol L. Williams Monica G. Turner Sarah C. Davis

Demand for bioenergy is increasing, but the ecological consequences of bioenergy crop production on working lands remain unresolved. Corn is currently a dominant bioenergy crop, but perennial grasslands could produce renewable bioenergy resources and enhance biodiversity. Grassland bird populations have declined in recent decades and may particularly benefit from perennial grasslands grown for ...

Journal: :Environmental management 2004
Robert G Warnock Margaret A Skeel

There have been no published performance evaluations of nongovernmental, voluntary habitat stewardship programs. The Operation Burrowing Owl (OBO) stewardship program, initiated in 1987, was evaluated for its effectiveness in conservation of grassland habitat during 1986-1993. The 108 OBO sites from 1987 to 88 and 98 randomly selected non-OBO sites that were grassland in 1986 in the Regina-Weyb...

2015
Heidi L. Adams L. Wes Burger Sam Riffell

Conservation Reserve Program Conservation Practice 33 (CP33: Conservation Buffers for Upland Birds) provides habitat for grassland birds in agriculture-dominated landscapes. However, landscape context and adjacency of other land covers may influence colonization, occupancy, and reproductive performance of breeding grassland birds in buffers. Our objective was to determine how edge effects influ...

Journal: :ecopersia 2011
bakhtiar fattahi ali reza ildoromi

species diversity is an index for sustainability of rangeland ecosystems. we studied the effect of environmental factors (soil properties and aspects) on plant species diversity in zagros mountainous rangelands (vegetation type: festuca ovina-astragalus parrowianus) in the west of hamadan in march–july 2009. for this purpose, four aspects were defined in the study area. vegetation types were st...

Journal: :Remote Sensing 2014
Fen Zhao Bin Xu Xiuchun Yang Yunxiang Jin Jinya Li Lang Xia Shi Chen Hailong Ma

The precise and rapid estimation of grassland biomass is an important scientific issue in grassland ecosystem research. In this study, based on a field survey of 1205 sites together with biomass data of the Xilingol grassland for the years 2005–2012 and the ―accumulated‖ MODIS productivity starting from the beginning of growing season, we built regression models to estimate the aboveground biom...

2017
Yiping Li Jianjun Zhao Xiaoyi Guo Zhengxiang Zhang Gang Tan Jihong Yang

Grassland, as one of the most important ecosystems on Earth, experiences fires that affect the local ecology, economy and society. Notably, grassland fires occur frequently each year in northeastern China. Fire occurrence is a complex problem with multiple causes, such as natural factors, human activities and land use. This paper investigates the disruptive effects of grassland fire in the nort...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2006
Joseph A Veech

For several decades, many grassland bird species have been declining in abundance throughout the Midwest and Great Plains regions of the United States, possibly due to loss of natural grassland habitat and increasing urbanization. I used 20 years of data from the North American Breeding Bird Survey to identify increasing, decreasing, and stable populations of 36 grassland-nesting bird species. ...

2015
Ryan G. Drum Christine A. Ribic Katie Koch Eric Lonsdorf Evan Grant Marissa Ahlering Laurel Barnhill Thomas Dailey Socheata Lor Connie Mueller David C. Pavlacky Catherine Rideout David Sample Stephanie S. Romanach

Grassland bird habitat has declined substantially in the United States. Remaining grasslands are increasingly fragmented, mostly privately owned, and vary greatly in terms of habitat quality and protection status. A coordinated strategic response for grassland bird conservation is difficult, largely due to the scope and complexity of the problem, further compounded by biological, sociological, ...

2014
Jason M. Hill J. Franklin Egan Glenn E. Stauffer Duane R. Diefenbach

Grassland bird species have experienced substantial declines in North America. These declines have been largely attributed to habitat loss and degradation, especially from agricultural practices and intensification (the habitat-availability hypothesis). A recent analysis of North American Breeding Bird Survey (BBS) "grassland breeding" bird trends reported the surprising conclusion that insecti...

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