نتایج جستجو برای: forest grass cover

تعداد نتایج: 227128  

2007
M. Kurtis Trzcinski Lenore Fahrig Gray Merriam

The aims o f this study were ( 1 ) to determine the relative importance o f the independent effects o f forest cover and fragmentation on the distribution o f forest breeding birds, and ( 2 ) to test the hypothesis that the negative ef fect o f forest fragmentation on species distribution increases with decreasing forest cover, i.e., the negative interaction ef fect o f forest cover and fragmen...

2010
K. YOSHINO T. ISHIDA T. NAGANO Y. SETIAWAN

Tropical peat swamp lands in the Southeast Asia which store tremendous large amount of carbon in their peat layer and abundant biodiversity are now endangered by human activities such as deforestation, forest fires, land development and urbanization. To earlier start a better environmental policy for conservation of nature of the tropical peat swamp area is one of the preferential global issues...

Journal: :محیط زیست طبیعی 0
آصف درویشی دانشجوی کارشناسی ارشد محیط زیست دانشکدۀ منابع طبیعی دانشگاه صنعتی اصفهان سیما فاخران استادیار گروه محیط زیست دانشکدۀ منابع طبیعی دانشگاه صنعتی اصفهان علیرضا سفیانیان استادیار گروه محیط زیست دانشکدۀ منابع طبیعی دانشگاه صنعتی اصفهان مهدی قربانی استادیار گروه مرتع و آبخیزداری دانشکدۀ منابع طبیعی دانشگاه تهران

large scale land use/cover changes and habitat fragmentation is a major factor in the distribution and functioning of ecosystems. for analysis the relationship between land use changes and their impacts on biodiversity, land cover and land use information is needed at different scales. the main goal of this study was to quantify the land use/ cover changes in arasbaran biosphere reserve, northw...

2017
Chittana Phompila Megan Lewis Bertram Ostendorf Kenneth Clarke Paul Aplin

Lao People’s Democratic Republic (PDR) has been experiencing significant forest depletion since the 1980s, but there is little evidence to demonstrate the major causes and underlying drivers for the forest cover changes. In this study, we investigated the relationship between forest cover decrease and increase in the south of Lao PDR between 2006 and 2012 and selected physical and socio-economi...

2006
Yuxing Zhang Conghe Song

gauge instrument or prism was introduced, which significantly expedited the process. There was no national forest resource information in China during 1963–1972. The first NFI was performed during 1973–1976, in which a stratified systematic sampling technique was used to locate NFI sample plots. Each province, autonomous region, or municipal city designed one or more sampling populations accord...

Journal: :The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences 2022

Abstract. This study compares four machine-learning algorithms comprising of Classification And Regression Trees (CART), Random Forest (RF), Gradient Tree Boosting (GTB) and Support Vector Machine (SVM) for the classification urban land-use land-cover (LULC) features. Using multitemporal multisensor Landsat data from 1984-2020 at 5-year intervals Greater Gaborone Planning Area (GGPA) in Botswan...

2016
Brenda B. Lin Jacqui Meyers Matthew Beaty Guy B. Barnett Marc A. Rosen

In many parts of the world, urban planning has a renewed focus on addressing the multiple challenges associated with population growth and climate change. Focused on local needs and priorities, these planning processes are raising tensions between more compact and dense urban form to reduce energy use and associated emissions and the provision of urban green infrastructure for ecosystem service...

Journal: :The Cryosphere 2022

Abstract. Land cover in sub-polar and alpine regions of northern eastern Europe have already begun changing due to natural anthropogenic changes such as afforestation. This will impact the regional climate hydrology upon which societies these are highly reliant. study aims identify impacts afforestation/reforestation (hereafter afforestation) on snow snow-albedo effect highlight potential impro...

ریاحی بختیاری, علیرضا , سلمان ماهینی, عبدالرسول , غلامعلی فرد, مهدی, میرزایی, محسن ,

Land cover has rapidly changed due to the relatively high population density, high rate of seasonal and permanent migrants, favorable conditions of natural and cultural, frequency of industrial units, coastal border and harbour and great rate of construction in the mazandaran province in recent years. Land cover changes are led to fragmentation, perforation, dissection, shirinkage, attrition an...

2003
Todd M. Scanlon John D. Albertson

[1] A two-layer soil moisture model was developed to infer the controls on the tree/grass coexistence in a savanna ecosystem. The model was applied along a mean annual precipitation gradient in southern Africa, known as the Kalahari Transect (KT), which follows a north-south decline in mean annual rainfall from 1600 mm/yr to 250 mm/yr between the latitudes 12 –26 S. Satellite-derived fractional...

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