Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 4

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The study aims at investigating the impact of ivy (Hedera helix L.) on the growth and on some wood anatomical characteristics of black alder trees. Ivy-hosting and non-hosting black alder have a similar wood anatomy in terms of qualitative properties. However, in ivy-hosting trees tangential and radial diameter of vessels are narrower (p <0.001), and inter-vessel pits are smaller (p <0.01), whereas vessel frequency is higher (p<0.05) than those of non-hosting ones. The average maximum ray height is greater (p<0.05), and ray number mm-1 is lower (p < 0.001) than those of non-hosting individuals. In addition, the last ten years’ average radial growth has decreased 39.5% compared to that of non-hosting black alder.
This study examined the anatomical characteristics of indented growth rings in Lebanon cedar. In the indented pattern of growth rings, the alignment and shape of tracheids and rays were found to be irregular, and distinctive trabeculae were identified in tracheids. Multiseriate parenchymatic rays occur in addition to uniseriate and biseriate ones. In the indented pattern the average tracheid length is shorter, whereas the lumen diameter and double-wall thickness are wider than those of unindented ones. The average maximum ray height is greater than that of normal wood. The average number of tracheids per mm2 differs only in latewood.
Taxonomic identification on the basis of wood anatomy showed that 68.82% of wood charcoals from the Early Bronze Age Site at Yenibademli, on Gökçeada Island (Imbros) in the Northern Aegean region of Turkey belong to the genus Quercus, 15.88% to Pinus, 13.51% to Phillyrea, 0.63% to Arbutus, 0.35% to Ulmus, and 0.23% to the Rosaceae family. The results revealed that the dominant tree genus was oak (Quercus sp.), 67.2% of which was deciduous oak, and the remaining 1.62% was evergreen oak. Quercus and Pinus as the most common two genera in the spectrum of taxa may have a link with oak and pine stands on Gökçeada (Imbros) in the Early Bronze Age. Moreover, the evergreen Quercus (sec. Ilex) and the genus Phillyrea, which was third in the spectrum, suggest that maquis and open vegetation were also present in the Early Bronze Age on Gökçeada.
This study deals with the wood of Marsdenia erecta R. Br., which is poorly known from a wood anatomical point of view. M. erecta, a woody-based perennial with numerous herbaceous sprawling stems, is distributed in the south and eastern parts of the Balkan Peninsula (incl. Crete)and Asia Minor to Afghanistan. The study aims at describing the wood anatomy of the species in detail based on IAWA list of microscopic features for hardwood identification, and at determining whether it has paedomorphic wood anatomical features. In M. erecta wood, the typical decreasing age-on-length graphic for vessel elements and exclusively upright and square ray cells provide strong arguments for paedomorphosis and secondary woodiness. However, to make a precise decision, this result based on wood anatomy should be checked with molecular phylogenetic data of the species investigated.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.