نتایج جستجو برای: hyrcanian forests

تعداد نتایج: 39508  

Journal: :رستنیها 0
فرشته شیخ حسن دانشجوی کارشناسی ارشد، گروه زیست شناسی، دانشکده علوم پایه، دانشگاه گیلان، رشت شهریار سعیدی مهرورز دانشیار گروه زیست شناسی، دانشکده علوم پایه، دانشگاه گیلان، رشت([email protected]) یونس عصری دانشیار پژوهش بخش تحقیقات گیاه شناسی، موسسه تحقیقات جنگل ها و مراتع کشور، تهران

the oak genus (quercus l.) is one of the most important genera of beach family (fagaceae) that has ecological and economical importance. chestnutleaf oak (quercus castaneifolia c.a. mey.) is native to iran and distributed in hyrcanian forests. pure and mixed stands of this taxon have covered about 6.5 % of hyrcanian forests. this study was undertaken to evaluate the effects of ecological factor...

Journal: رستنیها 2011

Nineteen species of mostly epiphytic lichens from the forests of Nowshahr and Royan located in Mazandaran province (N Iran) are reported. Three species, Ochrolechia pallescens, Phaeophyscia confusa and Usnea longissima, are newly reported for lichenized mycota of Iran and seven species are new to the province. Additionally, a short history of lichenological exploration in the Hyrcanian forest i...

KH. Sagheb-Talebi M. Amiri R. Rahmani

Canopy gaps are one of the most important structural features of forest ecosystems, and studying of them can have useful results and implications for forest management. The aim of this study is investigation of characteristics and regeneration within canopy gaps in an intact beech stand in the Shastkalateh Experimental Forest of Hyrcanian region, north of Iran. All canopy gaps and related fores...

اسدی, حامد, اسماعیل زاده, امید, سخاوت, صالح,

  This study was investigated the above-ground vegetation and soil seed bank flora in three site of Albizia julibrissin Durazz. In Hyrcanian Lowland Forests (including Haloomsar, Anjilisra forests and Sisangan Box tree (Buxus hyrcanus Pojark) reserve). Aboveground vegetation was sampled by 68 plots of 400 m2 during late June and seed bank flora was studied by seedling emergence method. The resu...

B. Sotoudeh Foumani S. Mohammadi Limaei T. Rostami Shahraji

The area of natural forest in Iran is approximately 12.4 million hectares, comprising 7.5%  of the total area of Iran. Forest management in the country was changed to the legislature after order of the Forest Nationalization Law in 1963. With  civilization development, pressure on forests was significantly increased. In the early  20th century a system of development planning began as a series ...

al et F. Bazdid Vahdati

Ata-Kuh forest, a preserved area within Hyrcanian relict forests, with an area of 700 ha is located in north of Iran. Based on floristic studies from 2011 through 2012, 194 vascular plant species were identified belonging to 143 genera and 66 families. Among our samples, 24 taxa were endemic to Hyrcanian area. The largest families in the area were Rosaceae (10.3 %), Poaceae (9.7 %), Asteraceae ...

Journal: :caspian journal of environmental sciences 2014
al et f. bazdid vahdati

ata-kuh forest, a preserved area within hyrcanian relict forests, with an area of 700 ha is located in north of iran. based on floristic studies from 2011 through 2012, 194 vascular plant species were identified belonging to 143 genera and 66 families. among our samples, 24 taxa were endemic to hyrcanian area. the largest families in the area were rosaceae (10.3 %), poaceae (9.7 %), asteraceae ...

Having accurate quantitative and qualitative information about the state of forest stands, is necessary for any basic management and planning, to reduce the effects of forest degradation. The current study aimed to model the destruction of Hyrcanian forests under the effects of density and volume (per hectare) variables, using logistic regression. In total, 252 plots of 1000 m2 area were measur...

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