Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran)
نویسندگان
چکیده
منابع مشابه
Comparison of Flood Routing Models (Case Study: Maroon River, Iran)
This study is undertaken to compare some different flood routing models including wave models and numerical models in the real field. The results of the wave models included kinematic, diffusive and dynamic wave have already been compared using laboratory data. Lack of the data field and technical support has been causes of not be investigated in the real field. In this present paper, several n...
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Salt tolerance genes constitute an important class of loci in plant genomes. Little is known about the extent to which natural selection in saline environments has acted upon these loci, and what types of nucleotide diversity such selection has given rise to. Here, we surveyed genetic diversity in three types of Na+/H+ antiporter gene (SOS, NhaD, and NHX, belonging to the cation/proton antiport...
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در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...
15 صفحه اولHow to Regenerate and Protect Desert Riparian Populus euphratica Forest in Arid Areas
We found that the most suitable flooding disturbance model for regenerating Populus euphratica forest was two to three times per year with a duration of 15-20 days and an intensity of 25-30 m(3)/s. The flooding should take place during the seed emergence to young tree growth stages, and should be based on flooding experiments and data from vegetation quadrats and ecological water conveyance. Fu...
متن کاملInvestigating the Structure of Beech Stands in the Gap Making Phase (Case study: Asalem Forests, Guilan)
Forest structure consider the spatial arrangement of trees characteristics such as age, size, species, gender and so on is.This study aimed to investigate the structural diversity of three one-hectare stands in the gap making phase, were studied. For this purpose, three sample plots with a one hectare area were selected in Asalem beech stands which belonged to the structural features of the gap...
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ژورنال
عنوان ژورنال: Journal of Forest Science
سال: 2018
ISSN: 1212-4834,1805-935X
DOI: 10.17221/146/2017-jfs