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Effect of Site Quality and Initial Stocking Density on Average Diameter in Black Wattle Plantations in Kenya

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The development of average stand dbh of black wattle in nine stocking density experiments in Kenya is analyzed. The influence of initial stocking density and site index on average stand diameter is investigated, and a multiple regression equation is developed to predict mean dbh with age, initial stocking density, site index, and their respective interactions as predictor variables. The results were highly significant and the equation accounts for 97 percent of the variation in squared average dbh in terms of age, stocking density, and site quality. The relationship between mortality and nominal stocking density is also investigated and a multiple regression equation is developed which predicts the actual number of trees which will contribute to bark yield under average conditions, using the initial stocking density, the square of this variable, and the interaction with age as predictor variables. This equation accounts for more than 99 percent of the variation in actual number of trees per unit area which will contribute to bark field. Forest Sci. 21:2-9.

Keywords: Acacia mearnsii; Site index; bark yield; diameter growth; height growth; mortality; rotation age; stocking density

Document Type: Journal Article

Affiliations: Wattle Research Institute, Natal, Republic of South Africa

Publication date: March 1, 1975

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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