نتایج جستجو برای: percentage of landscape

تعداد نتایج: 21172419  

Journal: :آمایش سرزمین 0
مهدی ایرانخواهی دکتری محیط زیست- ارزیابی و آمایش سرزمین، دانشکدة محیط زیست و انرژی، دانشگاه آزاد اسلامی- واحد علوم و تحقیقات، تهران، ایران سیدعلی جوزی دانشیار، دانشکدة فنی و مهندسی، دانشگاه آزاد اسلامی- واحد تهران شمال، تهران، ایران

the present study has been conducted on shemiranat county landscape, using lattice hexagon approach, for the first time, in order to achieve homogeneous units in degradation model. to this aim, with respect to the extent of the studied area, a lattice hexagon composed of 36 units (cells) was created and each grid cell was considered as a sub landscape. next, ecological vulnerability, degradatio...

Journal: :محیط زیست طبیعی 0
مهدی شیخ گودرزی دانشجوی کارشناسی ارشد محیط زیست، دانشکده منابع طبیعی، دانشگاه تهران، ایران افشین علیزاده شعبانی استادیار محیط زیست، دانشکده منابع طبیعی، دانشگاه تهران، ایران عبدالرسول سلمان ماهینی دانشیار محیط زیست، دانشکده شیلات و محیط زیست، دانشگاه گرگان، ایران جهانگیر فقهی دانشیار جنگلداری، دانشکده منابع طبیعی، دانشگاه تهران، ایران

human activities induced changes in land cover/use have extensive impacts on the landscape. in recent years, these changes had an increasingly growth due to irrational use of the natural resources in iran. hence, considering the negative effects of the inappropriate use of land and land-use change, understanding of the landscape changes over time is necessary to planning and implementation of s...

Journal: :منظر 0

what to look for in abbas abad pool? a lake in middle of the forest on the mountain heights with an encircled building with waters and a garden ashore? why are the trees cut and used to build a garden? and what is the purpose of placing a lake on a dominant and deep valley over the khazar sea. today, green trees are grown in abbas abad garden and no sign of landscaping or water features can be ...

Journal: :international journal of environmental research 2014
s. zubelzu c. del campo

this paper presents a new approach for assessing agricultural landscapes based on mixturemethods and the study and definition of aesthetic attributes as lines, forms, texture, spatial composition, scaleand color as they are the closest to human perceptual aesthetic attributes. a set of variables capable ofquantifying those attributes in a simple, objective and systematized way will be proposed....

اعتمادی, نعمت‌الله , شمس, الهام , مرتضایی‌نژاد, فروغ ,

Sophora japonica is a deciduous tree with fragrant white flowers and panicle inflorescence. This tree has not been used widely in the landscape of central. One of the reasons is lack of enough information about asexual propagation of this plant. In the present experiment, effects of different concentrations of indole butyric acid (IBA) and indole butyric acid-potassium salt (K-IBA) (0, 5000, 10...

 In this paper an artificial society is being assumed as a multi agents system. A sugarscape model consisting of a cellular landscape of resources is used to form an interaction among the agents of the population. In the model, agents find the resources to survive. They are supposed to move and search and because of this movement, an evolutionary social behavior will develope. From model analys...

Journal: :The American naturalist 2006
Samuel A Cushman Kevin S McKelvey Jim Hayden Michael K Schwartz

Predicting population-level effects of landscape change depends on identifying factors that influence population connectivity in complex landscapes. However, most putative movement corridors and barriers have not been based on empirical data. In this study, we identify factors that influence connectivity by comparing patterns of genetic similarity among 146 black bears (Ursus americanus), sampl...

Journal: :معماری و شهرسازی آرمان شهر 0
mahdi khakzand assistant professor of landscape architecture, department of environmental design engineering, graduate faculty of environment, university of tehran

the author in this research has tried to link the alexander pattern language theory, which is based on human oriented and spatial factors, to landscape design, which could come to a cyclic model of “a pattern language for landscape design” in iranian schools of architecture. so, a landscape design process based on the value of human-oriented approach, which is extracted from other values, and t...

2014
Sebastian Hopfenmüller Ingolf Steffan-Dewenter Andrea Holzschuh

Land-use intensification and loss of semi-natural habitats have induced a severe decline of bee diversity in agricultural landscapes. Semi-natural habitats like calcareous grasslands are among the most important bee habitats in central Europe, but they are threatened by decreasing habitat area and quality, and by homogenization of the surrounding landscape affecting both landscape composition a...

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