Carus Serdar, Catal Yilmaz
Department of Forest Management, Faculty of Forestry, University of Suleyman Demirel, 32260 Cunur, Isparta, Turkey.
J Environ Biol. 2010 Sep;31(5):609-14.
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.
本文介绍了土耳其西部伊斯帕尔塔地区25年生黎巴嫩雪松（Cedrus libani A. Rich.）人工林对不同强度间伐的生长响应。间伐强度以保留的断面积（%）为参数进行测量。2005年春季，进行了三种处理试验；轻度、中度和重度间伐，分别去除断面积的10%、25%和35%。试验的统计设计为随机不完全区组设计，有两个区组和三种处理。测量了胸径（直径）和树高等变量。中度间伐和重度间伐林分的直径生长率分别为1.02和1.03。中度间伐和重度间伐地块的断面积生长率分别为0.93和1.05。在重度间伐处理中观察到单株平均最大数值。在所有地块中，绝对直径增量与初始直径呈正相关。相对直径生长与初始直径呈负相关。生长率的解释通过使用邓肯多重极差检验的方差分析得到支持。所获得的结果表明，在（2005年、2008年）进行的两次清查中，不同处理间树高生长存在显著差异。然而，不同处理间树木的直径、断面积和材积未发现差异。
