Model Name: 3PG

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"3PG is an acronym for Physiological Principles Predicting Growth. It is a generalized forest carbon allocation model, published by Landsberg and Waring (1997), that works with any forest biome and can be run as an Excel spreadsheet by practicing foresters given a few days of training. The model uses relatively simple and readily available inputs such as species growth tables, latitude, aspect, weather records, edaphic variables, stand age, and stand density to derive monthly estimates of gross primary productivity, carbon allocation, and stand growth. The model has the capacity for specifying thinning regimes, although the function needs further refinement. In recent iterations, the 3PG model has been linked to satellite imagery of canopy photosynthetic capacity to model forest growth across landscapes (Coops et al. 1998). Intended as a practical management tool, the model is under constant revision to incorporate new research data, simplify application, and broaden its usefulness. Belowground processes and allocation are one of the least developed aspects of this model and we hope to contribute to the model's development with our envisioned research and application."

Contact/Model Admin Robert Muetzelfeldt, Simulistics, Ltd,
Submitted By Robert Muetzelfeldt, Simulistics, Ltd,
Submission Date 2010-06-16 14:54:54.0
thumbnail 3PG model diagram
Supplementary Data Files
E. globus with guessed tmin, tmax and toptimum
Sample met data file
Model Files original file, simplified file (use simplified if your software cannot read the file, e.g. Sloppy Cell)
Journal Forest Ecology and Management, 95: 209-228 
Title A generalised model of forest productivity using simplified concepts of radiation-use, efficiency, carbon balance and partitioning 
Year 1997 
Authors J.J. Landsberg and R.H. Waring