نتایج جستجو برای: Koeleria cristata

تعداد نتایج: 446  

ژورنال: :پژوهش های آبخیزداری 0
احمد احمدی عضو هیئت علمی مرکز تحقیقات کشاورزی و منابع طبیعی آذربایجان غربی فرهنگ قصریانی استادیار مؤسسه تحقیقات جنگلها و مراتع انور سنایی دانشجوی دکتری مرتعداری دانشگاه تهران مینا بیات کارشناس مؤسسه تحقیقات جنگل ها و مراتع الهه احمدی کارشناس ارشد مرتع داری دانشگاه علوم کشاورزی و منابع طبیعی ساری

هدف از این مطالعه، بررسی شدت های مختلف برداشت بر ویژگی های زایشی و رویشی گونه کلیدی koeleria cristata در مراتع قره باغ ارومیه به مدت 4 سال می باشد. به منظور انجام تحقیق ابتدا مساحتی معادل نیم هکتار در مراتع قره باغ ارومیه انتخاب و در سال اول به منظور انجام عملیات قرق محصور گردید. از این گونه 40 پایه انتخاب و به صورت ماهیانه در فصل چرای منطقه توسط قیچی باغبانی برداشت‎های 25، 50، 75 درصد و شاهد (...

Journal: رستنیها 2003
D. ERSHAD, K. VÁNKY

A new species of Tilletia, T. rostrariae Vánky & Ershad on Rostraria cristata is described and illustrated from Iran. It is compared with T. salzmannii, on the closely related Koeleria, and with the polyphagous T. bromi.

2001
Elke Naumburg Laura E. DeWald Thomas E. Kolb

Recent increases in Pinus ponderosa Dougl. ex Laws. forest density in the southwestern United States have severely reduced understory herbaceous biomass and altered understory species composition. To examine whether changes in graminoid species composition are caused by increased shading, we studied the effects of shade on leaf gas exchange, biomass, and reproductive characteristics of five gra...

Journal: :Tarim Bilimleri Dergisi-journal of Agricultural Sciences 2021

Facilitation or competition occurs among plant species when one alter ameliorates the environment for another needs same sources of species. The objective this study was to determine facilitative competitive effect on Bromus variegatus, Festuca ovina, Koeleria cristata growing with isolated, Medicago papillosa, Astragalus microcephalus, Thymus parviflorus, and Hypericum scabrum, arranged in com...

Journal: :Biology letters 2014
H K Zhou B Q Yao W X Xu X Ye J J Fu Y X Jin X Q Zhao

Worldwide, many plant species are experiencing an earlier onset of spring phenophases due to climate warming. Rapid recent temperature increases on the Tibetan Plateau (TP) have triggered changes in the spring phenology of the local vegetation. However, remote sensing studies of the land surface phenology have reached conflicting interpretations about green-up patterns observed on the TP since ...

2015
Mary I. Williams R. Kasten Dumroese Deborah S. Page-Dumroese Stuart P. Hardegree

Direct seeding is a common large-scale restoration practice for revegetating arid and semi-arid lands, but success can be limited by moisture and temperature. Seed coating technologies that use biochar may have the potential to overcome moisture and temperature limitations on native plant germination and growth. Biochar is a popular agronomic tool for improving soil properties, such as water av...

Journal: :The Journal of parasitology 1989
D W Duszynski

Twenty-four star-nosed moles, Condylura cristata, collected from the northeastern United States (Maine, Massachusetts, Ohio, Vermont) were examined for coccidian oocysts. All of the moles were infected with from 1 to 4 species of coccidia representing 2 eimerian and 3 isosporan spp., but oocysts of only 4 of these species were present in sufficient numbers for detailed study; these are describe...

Journal: :The Southeast Asian journal of tropical medicine and public health 1991
M F Choong J W Mak

Hematological changes were monitored in the leaf-monkey, Presbytis cristata, infected experimentally with 200 subperiodic Brugia malayi infective larvae. Prepatent periods were 54-86 days and peak microfilarial geometric mean counts (GMCs) were 1324 per ml blood. Total leukocyte and differential counts were measured at pre-infection, and then at weakly intervals before and during patency. Blood...

Journal: :Soil Science and Plant Nutrition 2022

Enclosure is an effective strategy for enhancing soil carbon sequestration in the desert steppe. Soil organic (SOC) and its stock during changes plant community influence fertility global cycle. We studied SOC along with six types steppe of Inner Mongolia, northern China. The goal this study was to explore differences among communities while accounting effects environmental factors. collected 3...

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