DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 12/1974 str. 48     <-- 48 -->        PDF

SUMMARY


Beech heartwood formation in the region of the Zrinj ska Gora Mountain (Croatia)


On the basis of the foregoing analyses relative to Beech heartwood formation
in the region of the Zrinjska Gora Mountain the following conclusions may be
drawn:


1. The maximal proportion of heartwood in the stem occurs between 4 m
and 8 m of height above ground, and from this zone the heartwood volume decreases
towards both the stump and the crown.
2. Heartwood formation in Beech trees is influenced by the following factors:
a) age, b) rate (magnitude) of the mean diameter increment, c) flushing time, and
d) crown volume.
Heartwood formation in the mentioned region starts after the age of 75.
The oldest tree without heartwood was a late flusher 111 years old.


Late flushers commence their heartwood formation later, somewhere after 110
years of age, possessing a lower percentage of heartwood formation than early
flushers. When analyzing heartwood formation, it is necessary to distinguish
between, late^ and early-flushing trees, for late flushers — even with a lower
increment rate and a smaller crown volume — exhibit a lower heartwood formation
than early flushers. The proportion of heartwood is lower in higher mean
diameter increment.


In larger crown volumes, heartwood formation is smaller, although the crown
volume magnitude also influences the magnitude of the mean diameter increment,
so that these two influences are difficult to distinguish from one another, but
nevertheless the influence of increment is more evident.


3. In view of the obove expositions we would be in favur of promoting late
flushers when performing silvicultural interventions. Through thinnings and clearings
we ought to make a faster growth and formation of regular crowns possible,
but we should not ignore the merchantable length of the bole either. Through
these silvicultural measures it would be possible to influence diminution of Beech
heartwood formation.