OPTIMIZATION OF POPULATIONDENSITY OF HALOXYLON SPP. PLANTATIONIN KASHAN (PHASE I)

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LOGHMAN H.; RAHBAR E.

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Journal: IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH Year:2002 | Volume:- | Issue:6 Page(s): 47-83

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Title

OPTIMIZATION OF POPULATIONDENSITY OF HALOXYLON SPP. PLANTATIONIN KASHAN (PHASE I)

Author(s)

LOGHMAN H. | RAHBAR E. | Issue Writer Certificate

Keywords

KASHANQ2

HALOXYLONQ3

WILTINGQ3

THINNINGQ4

VIGORITYINDEXQ4

SOIL TEXTUREQ4

Abstract

A general model was developed to explain the interrelationships of soil saturation percentage , mean annual precipitation, and population density on growth and vulgarity of planted HALOXYLON trees by Rahbar (1988). Soil saturation percent is an easy measure to determine the water (rain) availability to plants.The main recommendation of the model is THINNING the stands in accordance with the above named factors. Calibrating the general model for several regions, and optimizing the stands of HALOXYLON plantation in KASHAN area are the main objectives of the present study.Six density treatment were selected; two densities more than estimated number based on the model and two less than the estimated number, and the control. The treatments consisted of T1=329, T2=366, T3=410(estimated number), T4=452 , T5=490, and existing density as the control, T6= 557, trees per hectar. The treatments have been compared in a Randomized Complete Blocke Design, with four replications, since autumn of 1992 on nine-year-old trees.After THINNING practices, height (H) and crown diameter (CD) of the remained trees were measured. This was repeated during the growth periods in five years.Since the CD increment between the first and the last measurement was 40% more than H increment, therefore, a size index (SI) model of the form [H. (CD2)] , which was constructed by graphical trial and error, was found to distinguish the best among the 6 treatments.The growth percentage of H, CD and SI between the first and the last measurement were recorded. The analysis of variance of the factors showed that there is no significant differences between the H , but differences between the CD and SI is significant at I and 5 percent of significant levels respectively.Comparison of CD and SI mean between the treatments indicated that the highest significant growth rate belonged to Ts (group A), and lowest belonged to T6 (group.C); T2 , T3 and T4 is grouped under AB , and Tt is belonged to group of BC. This result implies that in KASHAN area, decreasing of density more than Ts is not suitable.The results indicated necessity of thinnig of HALOXYLON plantation in KASHAN for revival the vigor and increase of trees growth; it is also indicated the relative accuracy and correctness of the general equation for identifying the optimized population density of HALOXYLON plantation. By using the results of this project, not only the vigor of trees will revived, but also, because of higher increment of CD growth, the goals of soil conservation will be gaind and prepare the direct access of domesticated to trimming of trees and also prepared a lots of fuel woods for nomadic people.

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APA: Copy

LOGHMAN, H., & RAHBAR, E.. (2002). OPTIMIZATION OF POPULATIONDENSITY OF HALOXYLON SPP. PLANTATIONIN KASHAN (PHASE I). IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH, -(6), 47-83. SID. https://sid.ir/paper/107444/en

Vancouver: Copy

LOGHMAN H., RAHBAR E.. OPTIMIZATION OF POPULATIONDENSITY OF HALOXYLON SPP. PLANTATIONIN KASHAN (PHASE I). IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH[Internet]. 2002;-(6):47-83. Available from: https://sid.ir/paper/107444/en

IEEE: Copy

H. LOGHMAN, and E. RAHBAR, “OPTIMIZATION OF POPULATIONDENSITY OF HALOXYLON SPP. PLANTATIONIN KASHAN (PHASE I),” IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH, vol. -, no. 6, pp. 47–83, 2002, [Online]. Available: https://sid.ir/paper/107444/en

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