نتایج جستجو برای: woody species

تعداد نتایج: 553225  

Journal: :محیط زیست طبیعی 0
حمزه جعفری سرابی دانشجوی کارشناسی ارشد جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران بابک پیله ور استادیار گروه جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران غلامحسین ویس کرمی کارشناس ارشد علوم گیاهی، سیستماتیک گروه جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران جواد سوسنی استادیار گروه جنگلداری دانشکده کشاورزی، دانشگاه لرستان، ایران

forest reserves are one of the most important approaches in ecosystem management in iran. in order to determine the effects of reserve management on plants diversity (woody plants and ground flora) in three zones (core zone, buffer zone, and transmission zone of chamhesar pear forest reserve), we mapped land form units. then 18 main sampling units (20×50=1000 m2) distributed randomly were chose...

2017
Miles E McCoy-Sulentic Thomas E Kolb David M Merritt Emily C Palmquist Barbara E Ralston Daniel A Sarr

Wetland indicator status (WIS) describes the habitat affinity of plant species and is used in wetland delineations and resource inventories. Understanding how species-level functional traits vary across WIS categories may improve designations, elucidate mechanisms of adaptation, and explain habitat optima and niche. We investigated differences in species-level traits of riparian flora across WI...

2015
Stephanie G Yelenik Nicole DiManno Carla M D'Antonio

Harsh habitats dominated by invasive species are difficult to restore. Invasive grasses in arid environments slow succession toward more desired composition, yet grass removal exacerbates high light and temperature, making the use of "nurse plants" an appealing strategy. In this study of degraded subtropical woodlands dominated by alien grasses in Hawai'i, we evaluated whether individuals of tw...

براری, کامبیز, حجتی, سید محمد, فلاح, اصغر, کاظمی, شهره,

This study was undertaken to investigate the role of forest management in tree diversity, regeneration and vegetation in control and managed parcels of series No. 1 of forestry plan in Khalil-Mahale, Behshahr. Thirty samples with an area of 1000 m2 were systematically and randomly taken with a 100 × 75 m grid in both parcels. In each plot, tree number and species type were recorded. In order to...

Journal: :Proceedings. Biological sciences 2013
Jennie Houghton Ken Thompson Mark Rees

The idea that herbaceous plants have higher relative growth rates (RGRs) compared with woody plants is fundamental to many of the most influential theories in plant ecology. This difference in growth rate is thought to reflect systematic variation in physiology, allocation and leaf construction. Previous studies documenting this effect have, however, ignored differences in seed mass. As woody s...

2013
Shouren Zhang Dayong Fan Qian Wu Hui Yan Xinwu Xu Jessica Gurevitch Shouren Zhang Reto Strasser Jian Rang Wang

The purpose of this study was to investigate the eco-physiological adaptation of indigenous woody species to their habitats in karst areas of southwestern China. Two contrasting forest habitats were studied: a degraded habitat in Daxiagu and a well-developed habitat in Tianlongshan, and the eco-physiological characteristics of the trees were measured for three growth seasons. Photosynthetic rat...

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

the ecological potential assessment of forest sites introduces an index or indices that show the potential of forest site for fulfillment of special different roles of forest. khanikan forest at chalous needs precise investigation for assessment as indicator of lowland forests in forest ecosystems of northern iranwith considering its location position in caspian lowland and different values. th...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2010
W D Kissling R Field H Korntheuer U Heyder K Böhning-Gaese

Current methods of assessing climate-induced shifts of species distributions rarely account for species interactions and usually ignore potential differences in response times of interacting taxa to climate change. Here, we used species-richness data from 1005 breeding bird and 1417 woody plant species in Kenya and employed model-averaged coefficients from regression models and median climatic ...

Journal: :Proceedings. Biological sciences 2011
Zhiheng Wang Jingyun Fang Zhiyao Tang Xin Lin

What determines large-scale patterns of species richness remains one of the most controversial issues in ecology. Using the distribution maps of 11 405 woody species in China, we compared the effects of habitat heterogeneity, human activities and different aspects of climate, particularly environmental energy, water-energy dynamics and winter frost, and explored how biogeographic affinities (tr...

Journal: :global journal of environmental science and management 0
p. gandiwa school of agricultural, earth and environmental sciences, university of kwazulu-natal, private bag x01, scottsville, pietermaritzburg, south africa j. finch school of agricultural, earth and environmental sciences, university of kwazulu-natal, private bag x01, scottsville, pietermaritzburg, south africa t. hill school of agricultural, earth and environmental sciences, university of kwazulu-natal, private bag x01, scottsville, pietermaritzburg, south africa

mapungubwe cultural landscape (mcl) woody vegetation was characterized to establish structural and compositional attributes. stratified random sampling based on major soil types was used and nine plant variables were measured in 137(20x30) m2 sampling plots; these being genera, species and family names; basal circumference; plant height; depth and diameter of tree canopy; number of stems per pl...

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