Scientific paper

The Relationship between Site Characteristics and Pinus radiata Growth on the Tsitsikamma Plateau, South Africa

Published in: South African Forestry Journal
Volume 158, issue 1, 1991 , pages: 37–45
DOI: 10.1080/00382167.1991.9630373
Author(s): J.D. LouwDivision of Forest Science and Technology Saasveld Forestry Research Centre,


A site-growth study using a range of data from 46 plots on the Tsitsikamma plateau was undertaken for modelling the growth of Pinus radiata. Growth models for the prediction of site index at a reference age are imperative in an area with complex soil patterns such as occur on the Tsitsikamma plateau. The proposed model used three soil physical and three soil chemical parameters, explaining 77% of the variation in S120, which is relatively high for site-growth studies of this kind. Effective soil depth and available phosphate were found to be most significant site factors. The strategy of modelling on a landtype basis appears to be responsible for the good correlations that were found.

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