Vpliv razvoja, staranja in poškodovanj drevesa na lastnosti in kvaliteto lesa

slovenian

2006

volume 64, issue 9

Zveza gozdarskih društev Slovenije
(Obvezni izvod spletne publikacije)

An overview of ontogenetic, senescence and ageing alterations in trees is given. Their possible effect on wood quality with emphasis on the response of the living tree to superficial and deep wounds is described. The formation of the tree as an "open" system results from concerted activities of apical and lateral meristems. Compared with the total lifespan of a tree, living tissues and organs are relatively short-lived and subjected to relatively fast senescence and periodical renewal. Elimination of senescent organs and tissuesfunctions to maintain homeostasis within a tree, keeping shoots, roots and sapwod in balance. Removing of senescent organs and tissues take place in two ways: (a) in readily identifiable regions, the abscission zones (eg. leaves, bark, branches, roots, trichomes) or in a dynamic process of heartwood-formation and dehydration without abscission zones in the stem core.Senescence and death accompanied by nutrient recycling are important in the general economy of the tree. With increasing age and tree dimensions the eliminated dead stem core becomes more and more liable to wounding and infection resulting in loss of wood quality.

16.09.2009