Project properties

Title Growth responses to thinning in douglas fir
Group Forest Ecology and Forest Management Group
Project type thesis
Credits 27-39
Supervisor(s) FEM group: dr.ir. J (Jan) den Ouden
Other organisation: ing. René Olthof, Kroondomeinen het Loo
Examiner(s) Prof. Dr. Ir. G.M.J. (Frits) Mohren
Contact info Jan.denouden@wur.nl
http://www.wageningenur.nl/en/Persons/Jan-den-Ouden.htm
Begin date 2017/03/01
End date
Description Douglas fir (Pseudotsuga menziesii) is one of the most productive tree species in European forests. Douglas fir stands are maintained by thinning until a point where regeneration is started and the old trees removed. Conventional thinning rules prescribe crown thinning and the selection of potential crop trees. It is, however, not clear which thinning intensity is needed to stimulate growth of PCT’s, nor is it clear at which diameter the PCT’s should be harvested to get the optimal financial return.
In this project you will analyze the growth of several douglas fir stands on the Veluwe area, that have been monitored closely for 5 years. Growth is related to the competition experienced by individual trees, and overall stand density.
Activities will comprise field surveys and sample collections in Kroondomein Het Loo, Speulderbos and Oostereng and the development of a statistical model relating growth to tree dimension, competition and stand density.

/Biodiversity and functional diversity/ Population and forest dynamics/ Sustainable forest management/ Forest restoration and succession / Tree ring analyses and wood anatomy / Modelling /The Netherlands/ Europe/Temperate zone
Used skills Forest inventory and tree growth sampling
Tree ring analysis and growth reconstruction
Tree and stand growth modelling
Requirements FEM-30306 Forest Ecology and Forest Management;
REG-31806 Ecological Methods I;