Chris J. Cieszewski

Second International Conference on Forest Measurements and Quantitative Methods and Management & 
The 2004 Southern Mensurationists Meeting  pp. 262 - 263 June 2004

Abstract:
This is a short technical note presenting a new advanced dynamic site equation with polymorphism and variable asymptotes. I skip the background on how important this kind of work is because I direct this note strictly to advanced modelers who know all this stuff already and usually jump directly to the methods and results. If you don’t, you probably don’t want to waste your valuable time on this piece. However, even the expert modeler will find that this model is tough, although it may be worthwhile to play with, especially if all other models have failed. The new equation appears to be very flexible and was able to model needed patterns of polymorphism and varying asymptotes better than all other tested models. I recommend it for testing along with other models. I derived it to solve a very specific non-forestry problem, so there is no guarantee of this model’s generality, even though it solved a problem that I could not solve with any other published or my unpublished models – it just was the best for that specific problem. Furthermore, since development of this model was a part of some proprietary work outside of my academic employment I cannot reveal details of the work. I can provide only the model form, explanation of how to use it, and an example of a forestry data description by this model, for which I used some old tabular data. A word of caution is that the model has a very flexible derivation basis; and therefore, it may be unstable in some extrapolations, especially if it is fitted to some scruffy data (the model should be very stable along the t axis but might be problematic along the y0 axis). I recommend that the model be tested carefully for any use and applications.

Author Keywords:
Base-age invariant, dynamic equations, site models, site index, polymorphism, variable asymptotes.

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Addresses:
Chris J. Cieszewski, Warnell School of Forest Resources, University of Georgia, Athens, GA 30602

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