DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 11-12/1989 str. 90     <-- 90 -->        PDF

menata. To je zabrinjavajući iznos, pa i za autora ovoga rada, koji se nadao
— nakon serije objavljenih radova iz odnosne problematike — da se
u nastavku istraživanja neće sresti s tako frapantno negativnim rezultatima
kao što su ovi upravo izneseni u zaključcima ovoga rada.


LITERATURA


1.
Bojanin , S.: Gubitak kod sječe i izrade hrasta lužnjaka (Q. pedunculataEhrh.) obzirom na učešće sortimenata. »Drvna industrija« 3-4/1965.
2.
Golu b o vi ć, U.: Istraživanje ekonomskih posljedica truljenja i bonificiranja
bjeljike pri sušenju hrasta lužnjaka (Q robur L.) u šumama SR Hrvatske. »Šumarski
list« 9-10/1984.
3.
Golub ovi ć, U.: Ekonomske posljedice sušenja sastojina hrasta lužnjaka.
»Glasnik za šumske pokuse«, knj. br. 25.
4.
Kr al j e vic, B., G o 1 ub o v i ć, U.: Ekonomske posljedice sušenja hrasta lužnjaka
(Q. robur L.) — Prethodna obavijest — »Šumarska list« 1—2/1980.
5.
Plavšić, M. Golub ović, U.: Istraživanje sadašnje najpovoljnije s.ječne
zrelosti u sastojinama hrasta lužnjaka. Manuskript, Zagreb, 1968.
Some Comparative Data from Healthy and Dieback Stands of Pedunculata Oak


Summary


The dying back of individual trees in oak and other stands is an eternal
phenomenon. This is the normal, natural drying out or dying back of individual
trees due possibly to some silvicultural mistakes or omissions made in their
early days.


Just as there exists natural self-lopping or dying back of individual tree
branches in young and unthinned stands, there is also individual dying back of
whole trees, if some of the silvicultural measures were not or are not taken in
time. This is the natural reaction of forest stands, which is nothing unusual for
an expert.


However, if large-scale dying back not only of iidividual trees but also of
entire stands is noted, then this is no longer what foresters are used to, but
there must be other reasons for it, which are now being investigated.


We were entrusted with the daska od investigating the economic consequences
of such large-scale dying back not only af trees but also of entire pedunculate
oak stands. This paper is a preliminary result of these investigations.


Our investigations centered on healthy and dying back (physiologically weakened)
pedunculate oak stands of the same age, of the same habitat class, and
of the same mode of silvicultural husbandry. We proceeded from the faot that
sapwood is physiologically a component part of a live tree and that in the tehnological
sense it is a defect in the tree. In terms of its physical-chemical properties
sapwood in dying pedunculate oak stands is liable to rapid degradation,
or rotting, so that buyers of assortments of such oakwood necessarily
make deducations for it or they deduct the amount of sapwood the growing
stock and its value. In our investigations we have established that the diameter
of sapwood in oak trees or assortments averages 5 cm, or that it accounts for
27,42 per cent of the total growing stock or total assortments. We have further
found that making allowances for the sapwood, as substance, also lowers the
class of assortments of pedunculate oak trees, because by losing the standard of
the prescribed diameter they fall, according to Yugoslav Standards, to a lower
class and thereby achieve a lower price per unit. This together amounts in terms
of value ito 32,58 per cent of the market price of assortments, and constitues a