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Diameter, height and volume increment single tree models for improved Sitka spruce in Great Britain

Ruben Manso

Home publication Diameter, height and volume increment single tree models for improved Sitka spruce in Great Britain

The British forestry sector lacks reliable dynamic growth models for stands of improved Sitka spruce, the most important commercial forest type in Great Britain. The aim of this study is to fill this gap by trialling a new modelling framework and to lay the foundations of a future dynamic growth simulator for that forest type. First, we present single tree diameter and height increment models that are climate sensitive and include explicit competition effects. The predictions from the increment models are pooled to project diameter and height at a given age. These projections are then used as inputs to an integrated taper model from which stochastic tree volume predictions are obtained. Retrospective data from over 1400 trees collected in two extensive genetic trials in Scotland and Wales were used for the purposes of this study. Diameter increment and height increment predictions were highly accurate and diameter and height projections proved consistent. The predicted volume at the time of harvesting also exhibited a high degree of accuracy, which shows the robustness of our approach. Further data will be needed in the future to recalibrate the present models and extend their range of validity to the whole of Great Britain.

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Published
2021
Publication type
Peer reviewed papers
Contacts
Research Assistant
Forestry Staff Davidson Rachel 02.2e16d0ba.fill 600x600 1
Support Scientist (data analyst)
Forestry Staff Manso Ruben 05.2e16d0ba.fill 600x600 1