نتایج جستجو برای: bromus tomentellus boiss
تعداد نتایج: 3821 فیلتر نتایج به سال:
این پژوهش بهمنظور بررسی شاخصهای مختلف تعیین الگوی پراکنش Artemisia fragrans و Bromus tomentellus جهت تعیین بهترین شاخص نشاندهنده الگوی واقعی این گونهها در مراتع رزن - خوشواش ارتفاعات بلده نور انجام شد. نمونهبرداری به روش تصادفی- سیستماتیک در محدوده 2200 و 2400 هکتاری در امتداد 3 ترانسکت 100 متری انجام شد. در امتداد هر ترانسکت 10 نقطه تصادفی به فاصله 10 متر از هم، در مجموع 30 نقطه انتخاب و...
Ordination is the part of statistical ecology which has developed and integrated in recent years. Finding environmental factors which important in ecological structure determination of plant species is the final purpose of ordination. Ordination method was used for finding the effect of important variables on Bromus tomentellus species quantitative and qualitative changes in Esfahan's Fereidan ...
Ordination is the part of statistical ecology which has developed and integrated in recent years. Finding environmental factors which important in ecological structure determination of plant species is the final purpose of ordination. Ordination method was used for finding the effect of important variables on Bromus tomentellus species quantitative and qualitative changes in Esfahan's Fereidan ...
to study the effect of different harvesting intensity on forage production of bromus tomentellus was considered of majid abad qorveh. treatments included four harvested intensity 25, 50 and 75 percent and control (no harvest).data were analyzed based on splitplot over time during four years(1386-1389) using sas and irristat software. the results showed that the main effect of year, different ha...
rangelands have been composed of different plant species that emergence of phenological stages in every one of them will be influenced by environmental and genetic factors. in order to exploit the time and achieve acceptable performance in each plant species, it is necessary that the emergence of biological phenomena are recorded and studied. the objective of the present study is to survey the ...
in this study the effect of month, place and different years on the preferencevalue of bromus tomentellus in semi-steppe region was studied. the preferencevalue of the bromus tomentellus was studied in two years and four months in three sites as cheshme anjir (fars), badamstan (zanjan) firuzkuh (tehran). to determine the preferencevalue of species the two methods of as preference index and timi...
In order to investigate the effect of different intensities on the quality and quantity of forage in the Bromus tomentellus Boiss species, mountain ranges in the northeastern part of the Delfan city were selected. Three zones with different grazing intensities were selected including the grazing area (reference), medium grazing (key) and heavy grazing (critical). In each region, sampling of sur...
to evaluate the vegetative and productive characteristics and forage utilization by livestock at different stages of bromus tomentellus boiss.phonology, this experiment was carried out during five years in kordan rangeland of alborz province rangelands. so starting the grazing season and livestock entering, any remaining amount of forage grazing was harvested until a month intervals, and utiliz...
نوع آب و هوا، وضع گیاهان و اجتماعات گیاهی مناطق مختلف را تا حد زیادی مشخص میکند؛ بنابراین باید جهت بررسی و مطالعه گیاهان مرتعی، دامنه تحمل و بردباری هرگونه نسبت به این عوامل مشخص شود. در این مطالعه خصوصیات و نیازهای اقلیمی دو گونه از گندمیان مهم با ویژگی¬های علوفه¬ای و حفاظتی به نام¬های Agropyron trichophorum Richt. و Bromus tomentellus Boiss. در منطقه زاگرس مرکزی مورد بررسی قرار گرفتند. به ای...
از آنجایی که گونه bromus tomentellus یکی از مهمترین گونه های اکوسیستم های طبیعی از نظر کیفیت و کمیت در کشور ایران می باشد در تحقیق حاضر سعی شده تا با بررسی پویایی عناصر غذایی و سرعت تجزیه پذیری برگ و ساقه این گونه در مدت زمان یک سال، به شناخت روند تجزیه آن پرداخته شود. در این مطالعه از تکنیک کیسه لاشبرگ با ابعاد 20×20 سانتی متر و با منافذ 2 میلی متر استفاده شد. هر کیسه با حدود 5 گرم نمونه گیاه ...
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