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Title

THE EFFECT OF MIXING RATES ON QUALITATIVE AND QUANTITATIVE CHARACTERISTICS OF OAK– ZELKOVA PLANTATION

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 Start Page 155 | End Page 168

Abstract

 Plantation with broad leave species mixed with native tree species of Caspian forests is one of the most important strategies of Iranian forest plantation plans. On this target, the plan of this research was established in 1995. The treatments including pure OAK and four mixing rate mixed with ZELKOVA that performed in Chamestan forest and rangeland research station. The plots dimension was 25m´25m and planting distance was 1m´1m. Two outer lines of plantation were omitted in inventory for decrease of buffer zone. All of other trees were measured and recorded. The measured parameters incluing: diameter at breast height, total height, pruning height, crown equality, verticality, multi trunck, curvity in main trunk, transversal branches. For data analysis, One Way ANOVA and Tukey HSD tests were performed for comparision of MIXING RATES. The results show that mixed plantation has better situation than pure OAK plantation on the bases of GROWTH condition improvement and fertility. The highest survival rate of OAK was (85.53%) belong to treatment of 60% OAK– 40% ZELKOVA. Among all mixed treatment of OAK and ZELKOVA, the treatment of 70% OAK– 30% ZELKOVA showed best results of total height (9.27 m), pruning height (5.62 m), dominant diameter (10.9 cm), dominant height (12.67 m) and quality parameters such as crown equality, cylindric trunk, low amount of branches and other parameters including survival of ZELKOVA, mean of dbh, mean of total height, meam of basal area, mean of dominant diameter, dominant height of ZELKOVA, mean of dominant height, mean of height increment and GROWTH.

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