Effect of Site Quality and Initial Stocking Density on Average Diameter in Black Wattle Plantations in Kenya
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.
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Document Type: Journal Article
Affiliations: Wattle Research Institute, Natal, Republic of South Africa
Publication date: 1975-03-01
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