نتایج جستجو برای: margalef d

تعداد نتایج: 577766  

Journal: :محیط زیست طبیعی 0
مرضیه نوبخت دانش آموخته کارشناسی ارشد، دانشکده منابع طبیعی، دانشگاه گیلان، ایران حسن پوربابایی دانشیار دانشکده منابع طبیعی، دانشگاه گیلان، ایران مرضیه بیگم فقیر عضو هیأت علمی دانشکده علوم پایه، دانشگاه گیلان، ایران رویا عابدی دانش آموخته کارشناسی ارشد، دانشکده منابع طبیعی، دانشگاه گیلان، ایران

in order to investigate variations in plant diversity in dr. dorostkar's forest reservoir, located in gisoum talesh, 44 sampling plots were applied by the randomized-systematic method. the diameter of all tree species (dbh?5 cm) was measured in 400 m2 (20×20 m) square sampling plots. in addition, the number of individuals of shrubs and saplings (dbh?5 cm) were enumerated in circular 100 m2...

Journal: :Soil systems 2022

The population status and biomass of earthworms were studied in three different land use systems pasture (Pa), silvopasture (SP), mixed evergreen forest (MEF) from 2019–2020 the Solan district Himachal Pradesh, India. aim this study was to assess investigate how influence their abundance, diversity, biomass. Earthworms soil sampled using Tropical Soil Biology Fertility (TSBF) method all seasons...

Journal: :Pertanika journal of tropical agricultural science 2022

Hemipterans are the diverse, abundant, and important pests in paddy ecosystem due to their piercing sucking mouthparts that feed on crop causing significant losses rice yields. Despite roles ecosystem, information DNA barcode, diversity, species richness has been occasionally discussed. This study aimed measure its abundance, richness, barcode hemipteran from ecosystem. Active sampling was used...

ژورنال: بوم شناسی آبزیان 2017

This study was carried out to investigate the phytoplankton composition in Gorgan Bay. Water samples were collected from 11 selected sites in Golestan bay, monthly from March to February. Thirty five genus were identified among which Bacillariophyta was the dominate group with 17 genus, while the Euglenophyta had the minimum. Abundance and biomass of phytoplankton showed spatial and temporal va...

Journal: :Revista de saude publica 2005
Joyce Montes

OBJECTIVE To compare the Culicidae fauna in forest, ecotone and anthropic environments and to analyze their composition according to the number of species and individuals, species richness, diversity, heterogeneity and similarities and to determine species dominance and the relationship between species dominance and climatic factors. METHODS CO2 -baited CDC light traps were used for mosquito ...

Knowledge of the relationships between biotic components of rangeland ecosystem i.e. herbivores and plants is important for range managers. In order to study herbivorse grazing intensity on plant species diversity, an experiment was conductef using fuor grazing treatments in darrehshar rangelands, Ilam province in 2015. Plant species data were taken based on a randomized-systematic sampling met...

A.R. Pazira, H. Salehi, R. Obeidi,

This study aims to identify and determine species diversity and richness of the Gastropods of the intertidal zone of Bushehr seaport coastal area and assess the ecological status of this area using Welch index. Sampling was carried out at 6 stations in Bushehr seaport in the winter and summer seasons during 2013-2014. Bed sediment sampling was done three times in each station and Gastropod samp...

  Differences between plant biodiversity and grazing pastures grazed under improved management of rangeland habitat is of particular importance. The purpose of this study was to compare semi-steppe rangeland vegetation of Prdanan in the city of Piranshahr in the field under grazed and enclosed sites were considered. Sampled in both grazed and systematic random pastured five 40 meters trans...

ژورنال: علمی شیلات ایران 2019

Zooplanktons have an important role in food chain of the aquatic ecosystems, which acts as a food chain link between producers (phytoplankton) and higher nutritional levels. The purpose of this research was to identify and study the zooplankton density in the southeastern basin of the Caspian Sea (Gorgan Bay). Sampling was performed seasonally and samples were collected by zooplankton net (36 c...

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