نتایج جستجو برای: origin of trees

تعداد نتایج: 21174871  

Journal: :religious inquiries 0
sayyid reza moaddab qom university, iran fazel asadi amjad kharazmi university, iran hossein sattar kashan university

one of the recent inquiries in the field of hadith studies is the investigation of transferred traditions and their causes and impacts on shi‘i hadith circles. by exploring some traditions in the hadith collection of al-shaykh al-saduq and comparing the textual similarities and also the chain of transmitters, this research attempts to show that traditions of jewish origin in the shi‘i hadith ci...

Journal: :بیماریهای گیاهی 0
پژمان خدایگان نویسنده ابراهیم صداقتی نویسنده فائقه شرافتی نویسنده

bacterial wet-wood or bacterial slime is a common disease that affects the central core of many shade and forest trees like ash, fir, maple, oak, sycamore and elm (scortichini et al., 1991). symptoms of this disorder include a yellow-brown discoloration of the wood, generally confined to the central core of the tree. this affected wood is wetter than surrounding wood and is under high internal ...

Journal: :جنگل و فرآورده های چوب 0
سید یوسف عرفانی فرد استادیار، بخش مدیریت مناطق بیابانی، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران حمید سلیمانی دانشجوی کارشناسی ارشد، بخش مدیریت مناطق بیابانی، دانشکدة کشاورزی، دانشگاه شیراز، شیراز، ایران

diameter is such a notable characteristic in forest inventory that it is important to have a suitablemethod of its measurement, especially in coppice trees. this seems more important in zagros foreststhat most of them are covered with coppice trees. so this research was aimed to find an efficientmethod in studying the diameter at root collar (drc) of persian oak coppice trees as the mostimporta...

Journal: :Science 2009
R D Gray A J Drummond S J Greenhill

Debates about human prehistory often center on the role that population expansions play in shaping biological and cultural diversity. Hypotheses on the origin of the Austronesian settlers of the Pacific are divided between a recent "pulse-pause" expansion from Taiwan and an older "slow-boat" diffusion from Wallacea. We used lexical data and Bayesian phylogenetic methods to construct a phylogeny...

زارع, لعیا , عرفانی فرد, سید یوسف, فقهی, جهانگیر,

The ecological relationship between trees is important in the sustainable management of forests. Studying this relationship in spatial ecology, different indices are applied that are based on distance to nearest neighbor. The aim of this research was introduction of important indices based on nearest neighbor analysis and their application in the investigation of ecological relationship between...

Journal: :جنگل و فرآورده های چوب 0
مجتبی آذریان دانشجوی کارشناسی ارشد جنگل شناسی و اکولوژی جنگل، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران محمد رضا مروی مهاجر استاد گروه جنگل داری و اقتصاد جنگل دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران وحید اعتماد استادیار گروه جنگل داری و اقتصاد جنگل دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران انوشیروان شیروانی استادیار گروه جنگل داری و اقتصاد جنگل دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران سید محمد معین صادقی دانشجوی دکتری جنگل شناسی و اکولوژی جنگل، دانشکدة منابع طبیعی، دانشگاه تهران، کرج، ایران

the aim of study was to evaluate qualitative and quantitative characteristics of old trees in pattom and namkhaneh districts in the nowshahr, northern iran. the trees quantitative characteristics of dbh, total height, slenderness coefficient, trunk height, crown length, buttress height, and canopy cover area and qualitative characteristics of crown and trunk, i.e., health, vitality, and concurr...

2001
Michael D. Thompson Linda M. White

Introduction 3TRV \0 A method was developed to manipulate available soil water on large trees by intercepting thrufall with gutters placed under tree canopies and irrigating the intercepted thrufall onto other trees. With this design, trees were exposed for 2 years to either 25 percent less thrufall, normal thrufall, or 25 percent additional thrufall. Undercanopy construction in these plots mod...

Forest structure consider the spatial arrangement of trees characteristics such as age, size, species, gender and so on is.This study aimed to investigate the structural diversity of three one-hectare stands in the gap making phase, were studied. For this purpose, three sample plots with a one hectare area were selected in Asalem beech stands which belonged to the structural features of the gap...

سوسنی, جواد, عرفانی‌فرد, سید یوسف, فرهادی, پیمان,

It is so important to know about ecological characteristics of trees of a stand, in forest management. The first step to achieve this knowledge is to recognize the spatial pattern of trees. Therefore, regarding the enviro-economic  importance of F. orientalis in hyrcanian forests, this study checked spatial pattern of these trees. In order to do this research, 5 one-hectare plots with homogeneo...

رضائیان, فروغ , عرفانی فرد, سیدیوسف ,

Spatial pattern of trees in forests reveals how trees interact with each other and their environment. Spatial structure of trees in forest ecosystems is affected by environmental heterogeneity that leads to their heterogeneous distribution. This study was aimed to investigate the appropriate methods to analyze spatial pattern of heterogeneous wild pistachio woodlands in Zagros, Iran. A 40-ha pu...

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