نتایج جستجو برای: غنای کل total richness

تعداد نتایج: 878333  

Species richness is a simple and interpretable indicator of biodiversity and is one of the most important and and practical measurements in the rangeland ecosystems. Experimental models of richness are used to determine the points of richness of suitable and unsuitable species, and the factors affecting it. The aim of this study is to compare two methods of modeling species richness S-SDM and M...

2004
B R Burns

Descriptions of 247 forest stands at Waipoua Forest, Northland, were used to explore relationships between species richness (alpha-diversity) of the vascular flora and stand environmental characteristics, both in terms of total flora and within a number of the component synusiae. The Waipoua forests, with an average of 52 species per forest stand, are comparatively species-rich compared to othe...

Journal: :Ecological applications : a publication of the Ecological Society of America 2006
Regina H Magierowski Craig R Johnson

The usefulness of surrogates to estimate complex variables describing community structure, such as the various components of biodiversity, is long established. Most attention has been given to surrogates of species richness and species diversity and has focused on identifying a subset of taxa as a surrogate of total community richness or diversity. In adopting a surrogate measure, it is assumed...

Journal: :محیط زیست طبیعی 0
حمزه جعفری سرابی دانشجوی کارشناسی ارشد جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران بابک پیله ور استادیار گروه جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران غلامحسین ویس کرمی کارشناس ارشد علوم گیاهی، سیستماتیک گروه جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران جواد سوسنی استادیار گروه جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران

forest reserves are one of the most important approaches in ecosystem management in iran. in order to determine the effects of reserve management on plants diversity (woody plants and ground flora) in three zones (core zone, buffer zone, and transmission zone of chamhesar pear forest reserve), we mapped land form units. then 18 main sampling units (20×50=1000 m2) distributed randomly were chose...

2015
Miguel G. Matias Dominique Gravel Marine Combe Timothee Poisot Manon Lounnas Thierry Bouvier

Journal: :international journal of aquatic biology 0
bhushan kumar sharma [associate editor in: limnology and plankton] department of zoology, north-eastern hill university, shillong-793022, meghalaya, india. kyapaomai role sounii pou freshwater biology laboratory, department of zoology, north-eastern hill university shillong - 793 022, meghalaya, india. sumita sharma freshwater biology laboratory, department of zoology, north-eastern hill university shillong - 793 022, meghalaya, india.

a total of 90 species, belonging to 29 genera and 15 families, observed from an urban wetland of meghalaya is the species-rich rotifera assemblage known till date from any sub-tropical ecosystem of the indian sub-region. total richness (s) merits biodiversity value as ~56.0, ~ 38.0 and ~23.0 % of the species recorded from meghalaya, northeast india (nei) and india, respectively while several ro...

2013
Måns Svensson Anders Dahlberg Thomas Ranius Göran Thor

The increasing demand for forest-derived bio-fuel may decrease the amount of dead wood and hence also the amount of available substrate for saproxylic ( = dead-wood dependent) organisms. Cut stumps constitute a large portion of dead wood in managed boreal forests. The lichen flora of such stumps has received little interest. Therefore, we investigated which lichens that occur on stumps in young...

1994
A. Koizumi M. Arioka C. Harada M. Sugimoto Louise Guthrie C. Watts Roberta Catizone Yorick Wilks

The dictionary construction project at tile Japan Flectronic Dictionary Research Institute, Ltd. (El)R) in Tokyo began in 1986 and is ahnost certainly the largest lexicon construction project for computational purposes it] tile world. This paper describes some aspects of the construction of the English language dictionary, in particular a project to verify and enh,'mce information on noun phras...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی گرگان - دانشکده جنگلداری و مهندسی چوب و کاغذ 1391

درک الگوی توزیع مکانی ماکروفون خاک بدلیل اثرات آن روی فرآیندهای اکوسیستم بسیار مهم است. لیکن اطلاعات کمی در این خصوص وجود دارد. درمورد تنوع زیستی ارگانیسم ها وجانداران خاکزی که ازاجزای مهم وکلیدی درهرسیستم اکولوژیکی هستند و در بهبود حاصلخیزی خاک و تولیدات زمین وپایداری اکوسیستم ها(ازطریق فرآیندهای بیولوژیک)نقش عمده دارند تحقیقات کمی انجام شده است. این تحقیق جهت بررسی الگوی مکانی پارامترهای تنوع...

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