نتایج جستجو برای: wood density

تعداد نتایج: 447006  

Journal: :The New phytologist 2017
Christopher H Lusk Daniel C Laughlin

Forest ecologists researching the functional basis of tree regeneration patterns and species coexistence often attempt to correlate traits with light-gradient partitioning. However, an exclusive focus on light can overlook other important drivers of forest dynamics. We measured light, temperatures, humidity and sapling densities in each of four phases of a forest dynamic mosaic in New Zealand: ...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2016
N C Siliprandi E M Nogueira J J Toledo P M Fearnside H E M Nascimento

The present study aims to compare the allometry and wood density of Goupia glabra Aubl. (Goupiaceae) in two different terra-firme sites in Amazonian forest. A total of 65 trees ≥ 10 cm DBH was sampled in both sites, with 39 trees in Nova Olinda do Norte (NOlinda, near the Amazon River) and 29 trees in Apuí (near the southern edge of the Amazon forest). Except for the relationship between DBH (d...

Journal: :Ecology letters 2009
Jerome Chave David Coomes Steven Jansen Simon L Lewis Nathan G Swenson Amy E Zanne

Wood performs several essential functions in plants, including mechanically supporting aboveground tissue, storing water and other resources, and transporting sap. Woody tissues are likely to face physiological, structural and defensive trade-offs. How a plant optimizes among these competing functions can have major ecological implications, which have been under-appreciated by ecologists compar...

2006
Qinglin Wu Bing Zhang Linbing Wang Guangping Han

Strand-based composites are formed by arranging wood strands in a mat and bonding them together with adhesives under heat and pressure. The performance of these products is governed by the properties of wood strands, adhesive, manufacturing strategy, and production process. In this paper, a method of building a model to represent internal structure of oriented strandboard (OSB) based on x-ray t...

Selection of frost tolerant cultivars and understanding the mechanisms of frost hardiness could help to improve freezing resistance in olive plants. Olive cultivars may differ in frost hardiness due to differential survival of specific organs. The aim of this study was to screen different olive cultivars based on their stomatal density and metabolic modifications under cold conditions. The ‘Zar...

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

paulownia is one of the fast-growing species that was attended to supply industrial requirement in recent years. the application of this species is limited because of low density, so wood modification via compression and densification is an effective method. for this purpose, the paulownia boles were prepared from shastkalateh forest and cut into blocks with 60×20×20 mm dimension. the variable ...

2016
Sherwin Carlquist SHERWIN CARLQUIST

Wood anatomy of 14 species of Clematis and one species each of Delphinium, Helleborus, Thalictrum, and Xanthorhiza (Ranunculaceae) is compared to that of Glaucidium palma tum (Glaucidiaceae) and Hydrastis canadensis (Ranunculaceae, or Hydrastidaceae of some authors). Clematis wood has features typical of wood of vines and lianas: wide (earlywood) vessels, abundant axial parenchyma (earlywood, s...

2016
Cathy B. Kurz-Besson José L. Lousada Maria J. Gaspar Isabel E. Correia Teresa S. David Pedro M. M. Soares Rita M. Cardoso Ana Russo Filipa Varino Catherine Mériaux Ricardo M. Trigo Célia M. Gouveia

Western Iberia has recently shown increasing frequency of drought conditions coupled with heatwave events, leading to exacerbated limiting climatic conditions for plant growth. It is not clear to what extent wood growth and density of agroforestry species have suffered from such changes or recent extreme climate events. To address this question, tree-ring width and density chronologies were bui...

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