THE INVESTIGATION OF THINING EFFECTS ON THE QUANTITATIVE AND QUALITATIVE VARIABLIES ON LOBLOL PINE (PINUS TAEDA)_IN LAHIJAN REGION

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FIROUZAN A.H.; BONYAD A.ESLAM; FALAHCHAI M.M.

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Journal: Year:2006 | Volume:12 | Issue:3 Page(s): 513-524

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Title

THE INVESTIGATION OF THINING EFFECTS ON THE QUANTITATIVE AND QUALITATIVE VARIABLIES ON LOBLOL PINE (PINUS TAEDA)_IN LAHIJAN REGION

Author(s)

FIROUZAN A.H. | BONYAD A.ESLAM | FALAHCHAI M.M. | Issue Writer Certificate

Keywords

THINNINGQ3

THINNED STAND AND UNTHINNED STANDQ3

PINUS TAEDAQ3

T-TESTQ4

QUALITY AND QUANTITY STUDYQ3

Abstract

Careful operation of the silvicultureaml application is one of the most important methods for improving the quality and quantity of forestry that THINNING is also one of the important stages in this operation. in this study, for investigation forest changes in result operation of THINNING application in parrsel-28 of sery-3, two stands are selected with equal condition (which one of them was thinned and another stand was not thinned (stand control) In every stand, 30 samples of 4 areas are selected and different factors are compared after date analyzing and drawing diagram in two stand. By means of T-TEST it is cleared that the two stands have significant differences on the basis of diameter (2.94 cm), height (1.96 m) canopy height (1.34m) and volume (0/067m^3) variables. More light, better spacing and improved quality of forest, was caused increasing of diameter growth (%18.22), height (%14.97), canopy height (%44.22) and volume (%40.36) in the thinned stand. Diameter reduced coefficient is lower in thinned stand than another stand and it is because of the sylendric shap of the tree in thinned. Aََlso, variance investigation showed that two stands aren’t homogenized in the matter of meter, height, cannopy height, volume, diameter reduced coefficient and bole form factor scatter .mean h/d ratio in unthinned stand was greater than thinned stand that this show more unstability of unthinnrd stand. Also qualitive studies showed that trees in thinned stand have heigher quality. Investigation on the health stand showed that the present age of dried trees and wind thrown tree were respectively (%6.5) and (%4.5)_in thinned stand and (%8.5) and (%6.2) in thinned stand. Studies showed that THINNING have great effects on quantity, quality and stability of stand.

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APA: Copy

FIROUZAN, A.H., BONYAD, A.ESLAM, & FALAHCHAI, M.M.. (2006). THE INVESTIGATION OF THINING EFFECTS ON THE QUANTITATIVE AND QUALITATIVE VARIABLIES ON LOBLOL PINE (PINUS TAEDA)_IN LAHIJAN REGION. JOURNAL OF AGRICULTURAL SCIENCES, 12(3), 513-524. SID. https://sid.ir/paper/7581/en

Vancouver: Copy

FIROUZAN A.H., BONYAD A.ESLAM, FALAHCHAI M.M.. THE INVESTIGATION OF THINING EFFECTS ON THE QUANTITATIVE AND QUALITATIVE VARIABLIES ON LOBLOL PINE (PINUS TAEDA)_IN LAHIJAN REGION. JOURNAL OF AGRICULTURAL SCIENCES[Internet]. 2006;12(3):513-524. Available from: https://sid.ir/paper/7581/en

IEEE: Copy

A.H. FIROUZAN, A.ESLAM BONYAD, and M.M. FALAHCHAI, “THE INVESTIGATION OF THINING EFFECTS ON THE QUANTITATIVE AND QUALITATIVE VARIABLIES ON LOBLOL PINE (PINUS TAEDA)_IN LAHIJAN REGION,” JOURNAL OF AGRICULTURAL SCIENCES, vol. 12, no. 3, pp. 513–524, 2006, [Online]. Available: https://sid.ir/paper/7581/en

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