Abstract
The study presents a way of adjusting the prediction of a spatial single tree growth model on the basis of the adverse effect of ground water. The spatial distribution of growth resources is described by the depth of the groundwater table and the competition from neighbouring trees. The competition is described by a spatial model made for mineral soils. The depth of the groundwater table is calculated from the local stand volume and the distance from the nearest ditch. The effect of the spatial pattern of trees on the growth of a 25-year old Scots pine ( Pinus sylvestris L.) stand growing on a drained peatland was studied using the simulation model. Heavy clustering of trees decreased the volume growth by 5–13% compared with a regular spatial distribution. Between-tree variation in diameter growth was smallest and the volume growth best when the stand density was about three times higher on the ditch border than in the middle of two adjacent ditches.
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