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Paper Information

Journal:   IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH   2004 , Volume 11 , Number 2; Page(s) 179 To 190.
 
Paper: 

THE EFFECT OF THINNING ON GROWTH AND VIGORITY OF HALOXYLON SPP. PLANTATION IN YAZA

 
 
Author(s):  ZAREZADEH ABAS, RAHBAR E., ABOU ALGHASEMI MOHAMMAD
 
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Abstract: 

A general model was developed to explain the interrelationships of soil saturation percentage, mean annual precipitation and population density on growth and vigority of planted Haloxylon trees by Rahbar (1998). The 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 mentioned factors. Calibrating the general model for several regions, and optimizing the stands of Haloxylon plantation in Yazd area are the main objectives of the present study.

Six density treatments were selected; two densities more than estimated number based on the model, and two less than the estimated number, and the control treatment. The treatments consisted of T1=44, T2=50, T3=55 (estimated number), T4=60, T5=66, and the existing density as the control, T6=138 trees per hectar.

The treatments have been compared in a randomized complete block design, with four replications, since the spring of 1993.

After thinning practice, the height (H) and crown diameter (CD) of the remained trees were measured. This was repeated during the growth period in ten years. Since the CD increment between the first and the last measurements was 3-4 times more than H [HxCD2] increment; therefore, a size index (SI) model of the form: [HxCD2] (which was constructed by graphical trial and error, was found to distinguish the best among the 6 treatments. The growth of H and CD, between the first and the last measurement were recorded. The analysis of variance of the factors showed that there is no significant difference between the treatments; however, the highest H and CD growth rate respectively belonged to T3 and T4.
The analysis of variance of size index (SI) showed that there is no significant difference between the treatments, but the highest SI growth belonged to T4 and lowest belonged to T6 (control).

 
Keyword(s): HALOXYLON, SAXAUL, THINNING, SOIL TEXTURE, RAINFALL, YAZD
 
References: 
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