نتایج جستجو برای: modification of landscape directly affects ecological processes

تعداد نتایج: 21225525  

2003
Thomas Blaschke Lucian Dragut

Although a number of digital terrain analysis techniques were developed since the early 90ies terrain information is not utilized enough in landscape research even if topography is a key variable in a wide range of environmental processes. One explanation of this situation is the two-dimensionality of the main paradigm in landscape ecology, namely the patch-corridor-matrix model. Calculations o...

The management of areas with landscape ecological approach helps us to have more integrated of considering completely management and also keep the area’s values. Lar National Park and Varjin Protected Area are the most important areas of their biodiversity and wildlife habitats. The aim of this study was quantification of fragmentation in Lar National Park and Varjin Protected Area and to compa...

2005
Yuyu Zhou

NRS 534: Ecology of Fragmental Landscapes Yuyu Zhou Spring 2005 Overview Connectivity refers to the degree to which a landscape facilitates or impedes ecological flows such as the movement of organisms among habitat patches and therefore the rate of movement among local populations in a metapopulation (McGarigal et al. v3). Although connectivity is important in landscape ecology, there is no pr...

Journal: :محیط زیست طبیعی 0
علی لطفی استادیار، گروه محیط زیست، دانشکده کشاورزی و منابع طبیعی، دانشگاه اراک، ایران سید مهدی حشمت الواعظین استادیار گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران، ایران

agricultural landscapes with the green veins and forests patches are forming many parts of european landscapes. in spite of many ecological, economic and agricultural advantages of these elements, they have been changed due to agricultural intensification. we studied changes of these elements, their relations with agricultural activities, farming systems and land use of the adjacent parcel in t...

Journal: :ISPRS Int. J. Geo-Information 2015
Jihong Dong Wenting Dai Guoquan Shao Jiren Xu

With economic growth and the improvement of the urbanization level, human activities have constantly interfered with landscape patterns, resulting in serious threats to regional ecological security. Therefore, it is of great significance to study the evolution and optimization of the landscape patterns. Based on three TM images from 1990, 2000, and 2010, and selected landscape pattern indexes, ...

درویشی, آصف, سفیانیان, علیرضا , فاخران, سیما , قربانی, مهدی ,

Large scale land use/cover changes and habitat fragmentation have been associated with the decline of many wildlife populations in ecological sensitive regions. The main goal of this study was to quantify the spatial pattern changes in Caucasian Black Grouse habitat in Arasbaran Biosphere Reserve, Northwest of Iran in a period of 24 years (1987–2011). Caucasian black grouse (Tetrao mlokosiewicz...

Journal: :The American naturalist 2001
C C Vos J Verboom P F Opdam C J Ter Braak

Nature conservation is increasingly based on a landscape approach rather than a species approach. Landscape planning that includes nature conservation goals requires integrated ecological tools. However, species differ widely in their response to landscape change. We propose a framework of ecologically scaled landscape indices that takes into account this variation. Our approach is based on a c...

Surface roughness in the welding processes is one of the important parameters in the laser welded metal connections which affects laser beam absorption directly. When the laser beam is irradiated to the surface of the base metal, the surface roughness plays an important role in the amount of beam absorption and the amount of melting achieved and directly affects the penetration depth. The main ...

Journal: :Ecological applications : a publication of the Ecological Society of America 2016
T Trevor Caughlin Stephen Elliott Jeremy W Lichstein

Restoring forest to hundreds of millions of hectares of degraded land has become a centerpiece of international plans to sequester carbon and conserve biodiversity. Forest landscape restoration will require scaling up ecological knowledge of secondary succession from small-scale field studies to predict forest recovery rates in heterogeneous landscapes. However, ecological field studies reveal ...

2004
Jerry A. Griffith Carl C. Trettin

Geographic information systems (GIS) are increasingly being used in environmental impact assessments (EIA) because GIS is useful for analysing spatial impacts of various development scenarios. Spatially representing these impacts provides another tool for landscape ecology in environmental and geographical investigations by facilitating analysis of the effects of landscape pattern on ecological...

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