نتایج جستجو برای: the vegetation or land use

تعداد نتایج: 16369352  

Journal: :مرتع و آبخیزداری 0
سعیده حیدری کارشناس ارشد مرتع داری دانشگاه تهران علی اکبر مهرابی استاد گروه دانشکدة کشاورزی و منابع طبیعی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات محسن محسنی ساروی استاد گروه احیای مناطق خشک و کوهستانی، دانشگاه تهران سکینه ساعدی اوجقاز کارشناس ارشد مرتع داری دانشگاه تهران

the concept of land use transition highlights that land use change is non-linear and is associated with other societal and biophysical system changes. changes in human systems has resulted in changes in the natural system such as changes in land use. land use change causes not only environmental factors like geography and topography are important, but social factors examined such as population ...

2014
Y. Wang M. L. Roderick Y. Shen F. Sun

Terrestrial vegetation dynamics are closely influenced by both climate and by both climate and by land use and/or land cover change (LULCC) caused by human activities. Both can change over time in a monotonic way and it can be difficult to separate the effects of climate change from LULCC on vegetation. Here we attempt to attribute trends in the fractional green vegetation cover to climate vari...

Journal: :مرتع و آبخیزداری 0
بهزاد رایگانی استادیار دانشکده علوم محیط زیست و منابع طبیعی، دانشگاه محیط زیست غلامرضا زهتابیان استاد دانشکده منابع طبیعی، دانشگاه تهران حسین آذرنیوند دانشیار دانشکده منابع طبیعی، دانشگاه تهران سید جمال الدین خواجه الدین استاد دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان سید کاظم علوی پناه استاد دانشکده جغرافیا، دانشگاه تهران

arid and semi-arid areas, due to the sensitive, have variable ecosystems, so continuous assessment and monitoring of the environment is required for most of managerial and adjustment practices. vegetation is one of the most important assessment tools and used as a criterion for evaluation and monitoring of ecosystem functions. in this study, for the first time in the country, we have evaluated ...

Journal: :محیط شناسی 0
حمیدرضا پورخباز استادیار گروه محیطزیست، دانشکدة منابع طبیعی دانشگاه صنعتی خاتمالانبیا بهبهان حسین اقدر دانشجوی کارشناسی ارشد سنجش از دور و gis، دانشکدة علوم دانشگاه شهید چمران اهواز فاطمه محمد یاری دانشجوی کارشناسی ارشد ارزیابی و آمایش سرزمین، دانشکدة منابع طبیعی دانشگاه صنعتی خاتمالانبیا بهبهان سعیده جوانمردی مربی گروه محیط زیست، دانشکدة منابع طبیعی دانشگاه صنعتی خاتم الانبیاء بهبهان

introduction   capability evaluation can be considered as a basic strategy for land use becausethe development synchronous with the naturecan be achieved by using identifying and assessing of the ecological characteristics of the area. agricultural land suitability classification based on indigenous knowledge is vital to land-use planning (ecological capacity evaluation). execution of developme...

2002
Brian Hall Glenn Motzkin David R. Foster Mindy Syfert

Aim The aim of this study was to document changes in forest composition, structure and distribution across Massachusetts, USA, from the time of European settlement (seventeenth century) to the present, and to investigate environmental and historical influences on regional patterns of variation. Location The study area encompasses the State of Massachusetts (69.9–73.5 E, 41.3– 42.9 N), a 21,000-...

Every year, due to population growth and economy development, land uses and land covers are changing. The various types of land uses have significant roles on components of water balance of a watershed. The simulation modeling has the capability to predict floods, to evaluate land use impacts on floods, and to make decision in watershed management. In this research, the effects of land use chan...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده ادبیات و علوم انسانی 1394

the ability to speak two languages in the world is a remarkable achievement. there is a good reason to believe that bilingualism is the norm for the majority of people in the world because 70% of the earth’s population are supposed to be bilingual or multilingual. various investigations have shown that the native language impacts foreign word recognition, and this influence is adapted by the de...

2013
Stefan Gerber Lars O. Hedin Sonja G. Keel Stephen W. Pacala Elena Shevliakova

[1] Our understanding of Earth’s carbon climate system depends critically upon interactions between rising atmospheric CO2, changing land use, and nitrogen limitation on vegetation growth. Using a global land model, we show how these factors interact locally to generate the global land carbon sink over the past 200 years. Nitrogen constraints were alleviated by N2 fixation in the tropics and by...

2017
Sen Li Tao Wang Changzhen Yan

Policy has long been considered one of the major driving forces for land-use/cover change. However, research on the interactions between land-use/cover change (LUCC) and relevant policies remains limited. The agropastoral ecotone is a typical area of policy implementation and LUCC. Therefore, this study integrates the use of multisource and multiresolution remote sensing and topographic and fie...

Hassan Amini, Kazem Naddafi Masud Yunesian Ramin Nabizadeh Seyed-Mahmood Taghavi-Shahri,

Land use regression (LUR) models have been globally used to estimate long-term air pollution exposures. The present study aimed to analyze the association of different land use types and traffic measures with air pollutants in Tehran, Iran, as part of the future development of LUR models. Data of the particulate matter (PM10), sulfur dioxide (SO2), and nitrogen dioxide (NO2) were extracted from...

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