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ŠUMARSKI LIST 5-6/2007 str. 54     <-- 54 -->        PDF

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SUMMARY: This paper deals with growth and increment dynamics of
black walnut trees in culture planted at the Vukovar area in eastern region of
Croatia where black walnut has been cultivated for more than one century.


erother


Culture is situated inside the zone of most xerotherm subassociation of comli
– Qu


mon oak and hornbeam forest (Carpino betuli – Quercetum roboris quercetoing
rep


sum cerris Rauš 1969). The results of analyzing representative trees (from young,
middle aged and adult stand) show that black walnut is fast growing tree
species with height increment culmination before age of twenty years. Black
walnut trees at the age of fifty years achieve height of thirty meters and breast
height diameter of thirty centimetres, on the site of first productivity class. Vo lume
increment of black walnut trees is continuous even in the age of sixty to
eighty years. Comparing black walnut volume growth until the age of sixty
years with growth of other tree species on the high quality site, it was determined
that black walnut growth is faster and better then common oak (Quercus
robur L.), narrow-leaved ash (Fraxinus angustifloa Vahl), black alder (Alnus
glutinosa (L.) Gaertn.), and introduced green ash (F. pennsylvanica Marshall).
According to determined growth and increment dynamics, introduction
of black walnut in the appropriate habitat was proved justified. Even higher
productivity of black walnut cultures could be achieved by paying more attention
to plantation cultivation, especially timely thinning.


Key words: black walnut, growth, increment