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Hadhramout University Journal of Natural & Applied Sciences

Hadhramout University Journal of Natural & Applied Sciences

Abstract

The study had been conducted in Wadi Hadhramaut. Regular tree samples from windbreaks and shelterbelts had been collected for at least 3% sample size of each site while measurements of each tree were applied. High percentages of trees growth for height and stem diameter occurred in summer while crown width in spring. Evidence of measured trees in agricultural areas showed low and high figures of standard deviations ( ±0.538 - ±2.211m , ±0.539 -±3.289 m and ±1.652 - ±6.775 cm ) for height , crown width and stem diameter respectively, while the coefficient variation range of these characters were 7.06 – 18.41%, 12.25 – 35.21% and 11.61 – 26.59 respectively. The highest annual growth increment for height and stem diameter was occurred by Conocarpus lancifolius tree which would be reserved high wood stock. In sandy area, Acacia nilotica and Prosopis cineraria have gained high mean height, crown width and stem diameter out of the planted species while the standard deviations of the tree species were low and high which ranged between ±0.332 - ±1.204m, ±0.539 - ±2.049m and ±1.715 - ±5.04cm for height, crown width and stem diameter respectively. The coefficient variation of these characters was very high which ranged 22.64 – 53.17% except Parkinsonia aculeate. On other hand the correlation coefficient between the two characters of the tree height and stem diameter was mostly positive which may be around strong to medium and weak (+0.7479 , +0.4796 , +0.0413), also correlation coefficient may be opposite and negative in weak and very weak degree (-0.3156 ,- 0.0838).

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