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Relationship between height growth of stand and open grown single trees of scotch pine pinus sylvestris and site factors in great britain uk


, : Relationship between height growth of stand and open grown single trees of scotch pine pinus sylvestris and site factors in great britain uk. Forest Ecology & Management 4(3): 247-260

The relationship between height growth of Scots pine and site factors was examined for single trees growing in plantations and open situations, in order to examine the complete range of variation in competition, throughout Great Britain. A wide range of variables was recorded expressing geographical, topographical, soil chemical and physical variables and climatological change, as well as differences in genotype expressed by levels of monoterpenes. Additional variables expressing competition were added in this study. A principal component analysis was used to determine the main sources of variation in the site variables, and to make an initial selection or regressor variables for multiple regression. Multiple regressions were then calculated of the rate of height growth on the selected variables plus transformations and interaction terms. An equation accounting for 63% of the variation shows height growth rate to depend on competition effects, rainfall in April-June, and soil water holding capacity at 0-5 cm. A simpler equation which can be used for prediction without site visits, but which accounts for only 46% of variations is also presented.

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