نتایج جستجو برای: sahand rangelands

تعداد نتایج: 2475  

2007
Ahmed El Nemr Farzad Nasirpouri

The controlled production of magnetic nanowire arrays with outstanding characteristics is attracting much interest recently owing to their applications in emerging technologies related with magnetic information storage. Template electrodeposition is an efficient approaching method to fabricate these magnetic nanowires. In this paper, progresses and developments on the electrodeposition of magne...

Abstract The selection of the appropriate almond cultivars (Prunus dulcis Mill.) in dry and semi-arid regions like Iran in order to produce the optimal product is the importance. In order to study tolerance to water deficit stress, One-year old plants five almond cultivars/ genotypes on the GN15, A factorial experiment was conducted with a RCD which included 3 irrigations factors, 5 genotype...

Journal: :Journal of Range Management 1974

2004
Mohammad H. Emadi

The pastoral nomads of Iran, who had been able to achieve a “sustainable balance” between their environment and their economy throughout their history, are being held responsible for the degradation of the rangelands by the experts and state officials. The government of Iran has placed considerable resources into provision of advice and services to improve the natural resource status of Iranian...

2008
Keith T. Weber Steven S. Seefeldt

The potential for high severity fires to affect changes in rangelands is considerable, and for this reason, assessing fire severity is critical. We explored fire severity modeling in rangelands by applying post-fire field observations to Satellite Pour l'Observation de la Terre 5 (SPOT 5) imagery using Classification Tree Analysis (CTA) techniques at two 2005 burns. The results of these analyse...

2005
Richard B. Standiford Richard E. Howitt

Low profitability of hardwood rangeland manage­ ment, and oak tree harvesting for firewood markets and forage enhancement has led to concern about the long-term sustainability of the oak resource on rangelands. New markets for recreational hunting may give value to oaks for the habitat they provide for game species, and broaden the economic base for managers. A ranch level optimal control model...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی گرگان - دانشکده مرتع و آبخیزداری و شیلات و محیط زیست 1391

مراتع حدود نیمی از خشکی های جهان را در بر دارند و پوشش گیاهی آن در نتیجه تأثیر متقابل محیط و موجودات زنده به وجود آمده است و به عنوان یک اکوسیستم طبیعی مدیریت می شوند. علاوه بر مراتع، راه ها در عصر حاضر نیز از اجزا مهم و زیرساخت های اصلی زندگی نوین و توسعه کشورها به شمار می روند. جاده ها ساخته دست بشر هستند و جوامع گیاهی کنار جاده تحت تأثیر ساخت و ساز قرار دارند. پوشش "رودرال" به مجموعه ای از پ...

Journal: :journal of tethys 0

we present new whole major and trace elements data for a suite of adakitic dacite to rhyolite rocks from the sahand region. these rocks formed in the pliocene to pleistocene during the the collision between the arabian and eurasian plates following subduction of neo–tethys ocean. these subvolcanic intrusions were emplaced into late cretaceous and eocene sedimentary، volcano–clastic and volcanic...

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