A number of different software versions of the 3-PG model have been developed.

3-PG for Excel

A simple to use Excel version of 3-PG for plot data developed by Dr. Peter Sands (retired, CSIRO Australia).

Click here to download the Excel version of the model.

3-PG Spatial

A public version of the model was developed by CSIRO Australia and released in 2004. It uses Arc/INFO float files as inputs and allows to make spatial predictions. Please contact Dr. Nicholas Coops.

Other software implementations are available from individual model developers listed in the Model additions page. For up-to-date information on further development of the 3-PG model by CSIRO Australia please contact Anders Siggins or Dr. Auro Almeida.

Current Versions of 3PG Code and its availability

Model additions Contact Paper (DOI) Modifications

Dr Peter Sands‎

A simple to use Excel version of 3-PG for plot data developed by Dr. Peter Sands (retired, CSIRO Australia).

Spatial version


Nicholas Coops The model version can run both the standard 3PG as well as 3PGS which includes the use of remote sensing using GIS spatial layers to allow spatial predictions of 3PG outputs.

Structural stand variation



Dr. Rupert Seidl

Tel: +43 1 47654-91328

Adding an Agent Based management Engine (ABE) that allows simulating, at a tree level over a large area, and spatial interactions like tree competition or disturbance spread through landscape.

Stable isotope analysis


Dr. Liang Wei

The model add estimation of carbon composition and assess the coupling between carbon and water budget via gross primary production and canopy conductance

The model also add a temperature modifier for canopy conductance to  simulate seasonal patterns.

Soil respiration and

carbon accumulation

Dr. Angelo Nolè

The model modified the soil respiration model to predict both total ecosystem respiration and net ecosystem production.

This addition allows an estimation of the net ecosystem fluxes.

Soil organic matter decomposition



Dr. Georgios Xenakis
Tel.: +44 131 445 2176. The model integrate the soil organic matter and the nutrient dynamics that affect growth
Water balance

Dr. Auro C. Almeida An improved water balance model was added to predict the stand-level forest soil water balance, by diminishing the time step for rainfall, modelling canopy transpiration and soil evaporation as distinct process and dividing the sol profile in two distinct area (root and root-free zone).

Catchment scale



Combine 3-PG model and a modeling framework (TOPMODEL) that provides estimation at a catchment scale using a daily time step for precipitation.

This addition allows the model to estimate variation in flow patterns related to forest management.

Mixed species forest interactions and deciduous species



 Dr. David Forester This study adds a new light absorption sub-model so the 3-PG model is adapted for mixed-species forests and deciduous species
R3PG Daniel M.Griffith
Code to run the 3-PG model natively in R including code for predicting stable isotope ratios for plant material

Dr. Volodymyr Trotsiuk

Forrester, D.I., Trotsiuk, V. and Mathys, A.S. 2020. 3-PG: ein physiologisches Waldwachstumsmodell. Schweizerische Zeitschrift für Forstwesen 171, 158-164.

Reference Manual

Provides a flexible and easy-to-use interface for the 3-PGpjs and 3-PGmix model written in Fortran