Anatomska svojstva taksodijuma - egzote za meliorativna pošumljavanja

Abstract

U radu je istraživana visina i broj traka lignuma po mm2 površine kod stabala taksodijuma na dva aluvijalna staništa u Srbiji (Veliko ratno ostrvo i Bačka Palanka). Ukupno 6 stabala (po 3 na oba lokaliteta) je oboreno, a potom su uzeti poprečni preseci (koturovi), iz kojih su načinjeni trajni anatomski preparati. Na ovim preparatima su obavljena sva neophodna merenja. Broj traka lignuma po mm2 površine je određen tako što je u okviru svakog prstena prirasta odabrano po 6 vidnih polja određene površine (po 3 u okviru svake zone), a potom je na osnovu jednostavne proporcije izračunata brojnost traka lignuma po mm2. Visina traka drveta je izračunata brojanjem parenhimskih ćelija koje ih sačinjavaju. Istraživana svojstva traka lignuma merena su u zavisnosti od 3 elementa: kambijalne starosti, visine debla i zone unutar prstena prirasta. Što se tiče međusobnog odnosa broja i visine traka drveta, utvrđeno je da su u odnosu inverzije - veća brojnost traka drveta znači njihovu manju visinu i obratno. Cilj istraživanja je da se ustanovi kako se visina i broj traka lignuma po mm2 menjaju u zavisnosti od tri posmatrana faktora - starosti, visine debla i zone unutar prstena prirasta.

The paper deals with height and density of woody rays per mm2 by bald cypress stems at two alluvial sites in Serbia (Veliko ratno ostrvo and Bačka Palanka). Overall 6 stems (3 at one and 3 at another locality) were harvested. After that discs were made and they served for permanent anatomical preparations making. All necessary measurements were performed on these preparations. Inside each growth ring was selected 6 visible fields (3 at earlyand 3 at latewood zone) and within all fields density of woody rays per mm2 was calculated. According to simple equation number of woody rays per mm2 was determined. As for height of woody rays, it was calculated by parenchyma cells counting. Researched bald cypress features were measured depending on 3 factors: cambial age, stem height and zone inside growth ring. As for relation between number and height of woody rays, there is obvious inverse - greater density of woody rays means they are shorter. The scope of the paper was to establish how height and number of woody rays per mm2 change depending on 3 observed factors - age, stem height and zone inside growth rings.