Growth response of Lebanon cedar (Cedrus libani ) plantations to thinning intensity in Western Turkey.
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Date
2010-09
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Abstract
This paper presents the growth response of 25 yr old Lebanon cedar (Cedrus libani A. Rich.) plantation to thinnings of different
intensities in Isparta in western Turkey. The thinning intensity was measured by using the residual basal area (%) as parameter. In spring of
2005, three treatments were tested; light, moderate and heavy thinning with respectively 10, 25 and 35% of basal area removed. The statistical
design of the experiment was a randomized incomplete block with two blocks and three treatments. Variables such as diameter at breast height
(diameter) and height were measured. Growth rate ratios of diameter in moderately thinned and heavily thinned stands were 1.02 and 1.03,
respectively. Basal area growth rates in moderately thinned and heavily thinned plots were 0.93 and 1.05, respectively. The largest values for
the mean tree were observed with the heaviest thinning treatment. Absolute diameter increment was positively correlated with initial diameter
in all plots. Relative diameter growth was negatively correlated with initial diameter. Growth rate interpretations were supported by analysis of
variance using Duncan’s test of range multiple. The results obtained show significant differences between treatments for tree height growth,
for the two inventories carried out (2005, 2008). However, diameter, basal area and volume were no found between treatments for tree.
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Keywords
Lebanon cedar, Stand growth, Thinning intensity, Tree growth
Citation
Carus Serdar, Catal Yilmaz. Growth response of Lebanon cedar (Cedrus libani ) plantations to thinning intensity in Western Turkey. Journal of Environmental Biology. 2010 Sept; 31(5): 609-614.