نتایج جستجو برای: 20 cm in each plot in each sample

تعداد نتایج: 17125147  

Journal: :مرتع و آبخیزداری 0
فاطمه نقی زاده اصل فارغ التحصیل کارشناسی ارشد مدیریت مناطق بیابانی، دانشگاه تهران، ایران محمد جعفری استاد، دانشکده منابع طبیعی دانشگاه تهران، ایران حسین آذرنیومد استاد، دانشکده منابع طبیعی دانشگاه تهران، ایران محمد علی زارع چاهوکی استاد، دانشکده منابع طبیعی دانشگاه تهران، ایران

in this study, the role of soil properties in making difference between plant communitieswas examined. first, four plant types were identified, including pteropyrumaucheri-salsolarigida، astragalus gossypinus - acanthophyllum herateens، amygdalus scoparia – achilla millefolium and ephedra intermedia – erigon capestra, through randomized systematic sampling and field survey in representative are...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان 1389

wireless sensor networks (wsns) are one of the most interesting consequences of innovations in different areas of technology including wireless and mobile communications, networking, and sensor design. these networks are considered as a class of wireless networks which are constructed by a set of sensors. a large number of applications have been proposed for wsns. besides having numerous applic...

Journal: :مرتع و آبخیزداری 0
قاسمعلی دیانتی تیلکی دانشیار گروه مرتع داری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس علی محمدشریفی دانشجوی کارشناسی ارشد مرتع داری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس سید جلیل علوی استادیار گروه جنگل داری، دانشکدة منابع طبیعی دانشگاه تربیت مدرس

the present study was conducted in the rangeland of glandrood watershed in the province of mazandaran. the objective of this study was to compare between the ecological amplitude of festuca ovina l., and poa bulbosa l., using the function hof along the gradient of the environmental variables. for this purpose 150 plots of 1m2 were established along the altitude gradient. the sampling method was...

صادق کوهستانی, جواد, عادل, محمد نقی, پوربابائی, حسن,

The aim of this study was to investigate some of the most important ecological features of the Hackberry trees in Guilan forests. Data was collected using 25 and 20 plots (Rezvanshahr and Tanean sites, respectively) based on the presence and absence of Hackberry. The inventory was selective sampling method. A circular sample plot with an area of ​​1000 m2 was used. Some geographical and ecologi...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران - دانشکده علوم انسانی و اجتماعی 1392

tourism , today as one of the ways to make money, create jobs , and social and political interactions is considered. this paper aims to examine the strengths and weaknesses of tourism development in mahmoud abad ( mazandaran ). the research method in this study is " descriptive - analytical " and to collection of data used field methods such as questionnaires and documentation - library. the sa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - پژوهشکده ادبیات 1393

1.0 overview it seems that grammar plays a crucial role in the area of second and foreign language learning and widely has been acknowledged in grammar research. in other words, teaching grammar is an issue which has attracted much attention to itself, and a lot of teachers argue about the existence of grammar in language teaching and learning. this issue will remind us a famous sentence f...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد گرمسار - دانشکده علوم انسانی 1391

abstract the following study, in the first place, attempted to examine the effect of less experienced teachers participation in experienced teachers classes on their own skills and teaching methodology, in the second place, attempted to find out the role of teachers training in students achievements. for this purpose, 21 efl teachers were selected according to available sampling in kish l...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده علوم 1391

nanotechnology is a general term which is related with field of all advanced science term that generally predicates with all modern technologies which consider nanoscales. improvement in the quality of products by adding some nanoparticles and study of their behavior in the presence of these nanoparticles have been obtained in many researches. on the other hand numerous demands for sowing ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده روانشناسی و علوم تربیتی 1388

the aim of this study is investigating the effect of teaching “metacognitive strategies” on the way which scientific information retrieval workes by the using of google scholar searching machine on the students of ms in the psycology & education faculty of allameh tabatabayi university in 2007-2008 academic year. the statistical community was the students of ms in psychology & education facult...

Plant diversity and vegetation distribution in an area are related to the soil physical and chemical properties. The knowledge of relationships between species diversityand soil parameteris essential for sustainable ecosystem management. This study was conducted to investigate the relationships between soil factors and species diversity indices in the protected rangelands of Lashgardar, Malayer...

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