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" Autecology of Phulai (Acacia modesta Wall.), in Pakistan "
M. Arshad
R. D. Pieper
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Latin Dissertation
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| Language of Document
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English
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| Record Number
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1112746
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| Doc. No
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TLpq303710584
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| Main Entry
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M. Arshad
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R. D. Pieper
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| Title & Author
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Autecology of Phulai (Acacia modesta Wall.), in Pakistan\ M. ArshadR. D. Pieper
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| College
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New Mexico State University
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| Date
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1989
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| student score
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1989
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| Degree
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Ph.D.
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| Page No
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114
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| Abstract
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The main objective of this study was to determine twig growth of Phulai (Acacia modesta Wall.) at 3 locations, in Pakistan. The study was initiated in June 1987. To assess mean twig growth, 10 trees were randomly selected at each location and 30 twigs were marked on each tree. These twigs were permanently tagged and measured, six times from February 1987 to October 1988. Only current twig growth was measured each time. Simple linear and polynomial regression analyses were conducted to develop relationships among twig growth and tree variables. Plant density, circumference, height and the crown diameters of each tree were measured. Herbaceous cover and biomass of the understory vegetation were also evaluated. Edaphic characteristics were determined from a soil pit at each site and from the chemical analysis of the soil samples. Phenological observations were made on Phulai trees from the time of flowering, to maturation of pods. Soils of Margella Hills were clay loams, those of Pabbi Hills were, sandy loams and those of the Salt Range, sandy clay loams. Tree density was 197, 186 and 147 trees per hectare at Margella Hills, Pabbi Hills and Salt Range while the crown cover was 34.9, 13.9 and 5.0 m2 for ten sample trees respectively at each location. Split plot analyses of variance showed that there was a significant (p <. 05) interaction between location and twig measurement periods. Twig length increase was generally higher at Margella Hills, but during drought periods, growth was just as great at the other two locations. Mean twig growth for Margella Hills, Pabbi Hills and Salt Range was 5.25, 3.97 and 2.70 cm. This reflects the fact that Margella Hills has the highest precipitation, greatest humidity and lowest evapotranspiration rates compared to other sites. The regression analyses showed a weak linear relationship between twig growth and tree variables and slightly stronger quadratic relationships. These relationships probably reflected more live and photosynthetically active crown cover canopy for intermediate aged trees compared with the younger and older trees.
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| Subject
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Biological sciences
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Biology
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Forestry
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Range management
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