نتایج جستجو برای: سبط stipagrostis plumosa
تعداد نتایج: 139 فیلتر نتایج به سال:
Coralline red algae play a key role in the ecology of near shore marine ecosystems and are increasingly being used to study the effects of climate change in the marine environment. Corallines are very difficult to identify to species, and even to genus, using morpho-anatomy, likely complicating studies of their ecology, physiology, and biodiversity. We sequenced a 296 base pair fragment of chlo...
Soil erosion and sand movement is one of environmental threats of the desert areas and vegetation partially prevents the creation of this phenomenon. One of the most important species growing in Sabzevar desert plains and sandy dunes, regarding too dense canopy and their root density, which have a considerable impact on soil protection and prevent movement of sands, is Stipagrostis pennata. ...
Ocean acidification caused by rising atmospheric CO₂ is predicted to negatively impact growth and calcification rates of coralline algae. Decreases in coralline abundance may have cascading effects on marine ecosystems and on carbon sequestration worldwide. In this study, we measured growth and calcification rates of three common species of articulated coralline algae (Bossiella plumosa, Callia...
this study was carried out to investigate the effective environmental factors in the distribution of vegetation in zirkouh rangelands of qaen. after delimitation of the study area, sampling of soil and vegetation were performed using randomized- systematic method. vegetation cover was recorded by using braun-blanquet combined abundance-cover scale in each sample. within each sample, one profile...
Recent morphological and genetic studies on the Caulerpa racemosa (Forsskål) J. Agardh complex have demonstrated that three taxa occur in the Mediterranean Sea. One of them, the ‘invasive variety’, provisionally regarded as close to C. racemosa var. occidentalis J. Agardh, is currently spreading spectacularly throughout the Mediterranean. On the basis of new morphological and molecular studies ...
چکیده از آنجایی که امام حسن(ع)، سبط پیامبر و امام دوم شیعیان، مورد توجه برخی اسلام شناسان غربی واقع شده اند و آنان دعاوی و شبهاتی را پیرامون شخصیت فردی، خانوادگی و سیاسی ایشان مطرح کرده اند، رساله حاضر با بهره گیری از روش توصیفی و از طریق جمع آوری، فراوانی سنجی و پردازش اطلاعات به ترجمه و شناسایی دیدگاه های آنان از نیمه دوم قرن نوزده تا اواخر قرن بیستم پرداخت؛ در حقیقت در این نوشتار این سوال م...
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