The growth of trees in the JABOWA model (and subsequent models like Kiwi) is diameter-dependent, following the pipe model. The diameter increase is dependent on the previous diameter, maximum height and diameter and an allometric factor under the fraction bar.
As Bugmann et al. (2001 - A review of forest gap models) points out, the growth deltaD equals G*D*(1-D*H/Dmax*Hmax) / b(D) * corr. Where corr is a correction factor, G is a species dependent growth parameter, D and H are Diameter and Height and b(D) is the allometric factor. b(D) is a function of the height but I can't figure out how the authors got this.
My aim is to introduce another height-formula into the model, but I need a new allometric factor as well.
Article A Review of Forest Gap Models
For everyone still following this: I gave up on trying to find a way to separate the growth functions of diameter and height within the JABOWA-Model. It is not possible without losing core funtionalities.
However, the thinking behind the pipe-model is a great starting point for a growth model that decouples diameter and height.
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