نتایج جستجو برای: forest species changing

تعداد نتایج: 771031  

Journal: :پژوهش های علوم و فناوری چوب و جنگل 0

the aim of this study is comparison of soil characteristics and biodiversity in plantation of bald cypress and caucasian alder forest stands in kludeh region (mazandaran province). in order to study biodiversity in forest stands and control region, 10 sample plots (releve) were selected and the name and abundance of plant species of the forest floor were recorded. biodiversity of herbal plants ...

Journal: :جنگل و فرآورده های چوب 0
وحید اعتماد استادیار گروه جنگلداری و اقتصاد جنگل، دانشکده منابع طبیعی، دانشگاه تهران مرتضی مریدی دانشجوی کارشناسی ارشددانشگاه تهران کیومرث سفیدی استادیار دانشکده فناوری کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی

evaluating the forest stands structure in different development stages is one of the ways for better understanding the forest dynamics and its response to natural disturbances. this study was carried out in the compartment 319, kheiroud forest in order to quantify the structure properties of mixed beech stands in the stem exclusion phase. for this purpose, three one-hectare sample plots were se...

2011
F. Zemek M. Edwards J. Novotný S.J.S. Khalsa

* Corresponding author ** The study is supported from projects: COST OC09001, MEYS of CR; CzechGlobe – Centre for Global Climate Change Impacts Studies, Reg. No. CZ.1.05/1.1.00/02.0073 Abstract – Long-term and lasting human interference in forest ecosystems, together with changing climatic conditions in Central European mountain forests have resulted in the loss of equilibrium mechanisms and a ...

Journal: رستنیها 2011

Nineteen species of mostly epiphytic lichens from the forests of Nowshahr and Royan located in Mazandaran province (N Iran) are reported. Three species, Ochrolechia pallescens, Phaeophyscia confusa and Usnea longissima, are newly reported for lichenized mycota of Iran and seven species are new to the province. Additionally, a short history of lichenological exploration in the Hyrcanian forest i...

2014
Madelon Lohbeck Edwin Lebrija-Trejos Miguel Martínez-Ramos Jorge A. Meave Lourens Poorter Frans Bongers

Global plant trait studies have revealed fundamental trade-offs in plant resource economics. We evaluated such trait trade-offs during secondary succession in two species-rich tropical ecosystems that contrast in precipitation: dry deciduous and wet evergreen forests of Mexico. Species turnover with succession in dry forest largely relates to increasing water availability and in wet forest to d...

2006

mist-nets in three study sites, in primary forest and in 5-year-old and 10-year-old logged forests, in Sungai Lalang Forest Reserve, West Malaysia. A total of 58 species (271 individuals) was recorded in primary forest, 62 species (288 individuals) in 5-yearold logged forest, and 61 species (386 individuals) in 10-year-old logged forest. Assessment of feeding guilds indicated that insectivorous...

Journal: :international journal of advanced biological and biomedical research 2013
abas jamshidi bakhtar khosro sagheb-talebi mohamad reza marvi mohajer maziar haidari

fire, as a natural ecological disturbance factor in forest, this study located in the marivan region, northern zagros forest, and western iranian state of kurdistan. in each burned and unburned area 30 circle sample plot (1000 m2) were collected by randomized–systematic method in the 100×200 m net (in total 60 plots). in every sample plot the kind of species, number of tree, the height of coppi...

2010
Alfonso Díaz Eduardo Galante Mario E. Favila

Understanding the response of species to anthropogenic landscape modification is essential to design effective conservation programs. Recently, insects have been used in empirical studies to evaluate the impact of habitat modification and landscape fragmentation on biological diversity because they are often affected rapidly by changes in land use. In this study, the use of the landscape matrix...

Journal: :Ecological applications : a publication of the Ecological Society of America 2010
M G Betts J C Hagar J W Rivers J D Alexander K McGarigal B C McComb

Recent declines in broadleaf-dominated, early-seral forest globally as a function of intensive forest management and/or fire suppression have raised concern about the viability of populations dependent on such forest types. However, quantitative information about the strength and direction of species associations with broadleaf cover at landscape scales are rare. Uncovering such habitat relatio...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده منابع طبیعی و علوم دریایی 1388

this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید