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RAP-ORGANON, Alnus rubra plantations in Oregon and Washington (USA)

Status: In development | Version: v1.0.0 (2026-08-28)

General description

  • Description: Individual-tree growth model for Alnus rubra plantations in Oregon and Washington (USA)
  • Target Species: Alnus rubra (code: 999)
  • Application Region: Oregon and Washington (USA)

Technical characteristics

  • Model Level: Individual tree
  • Allows Projection: Yes
  • Projection Time Step: 1 year

To view the step-by-step sequence of initialization, projection, and harvest, see the individual-tree model calculation flow diagram.

Required variables

To run this model in SIMANFOR, the initial inventory must include the following minimum data:

Plot level (Plots sheet)

  • Inventory and plot IDs
  • age

Tree level (Trees sheet)

  • Inventory, plot and tree IDs
  • species
  • expansion factor
  • dbh

Sample inventories

You can download the following sample inventories in Excel format to test this model:

Modules and equations

Breakdown of simulated biological processes and their methodological references:

  • Reference forest growth model: Hann et al. (2023), Hann et al. (2011)
  • Diversity indexes: Omoro et al. (2010), Simpson (1949), Ulanowicz (2001), Bray & Curtis (1957)
  • Structural and size indexes: Varga et al. (2005), Moreno-Fernández & others (2025), Barbeito (2009)

References and documentation

  • How to Cite this Model:

SIMANFOR, 2026. Individual-tree growth model for Alnus rubra plantations in Oregon and Washington (USA) (v1.0.0). https://www.simanfor.es

  • SIMANFOR Citation:

Bravo, F., Ordóñez, C., Vázquez-Veloso, A., Michalakopoulos, S., 2025. SIMANFOR cloud Decision Support System: Structure, content, and applications. Ecological Modelling 499, 110912. https://doi.org/10.1016/j.ecolmodel.2024.110912

  • Technical Documentation: SIMANFOR Models Repository (GitHub)

  • Model Bibliography:

  • Barbeito, I. (2009). Natural regeneration dynamics of Pinus sylvestris L. in Central Spain.
  • Bray, J. R., Curtis, J. T. (1957). An Ordination of the Upland Forest Communities of Southern Wisconsin. Ecological Monographs.
  • Hann, D W, Bluhm, A A, Hibbs, D E (2011). Development and evaluation of the tree-level equations and their combined stand-level behavior in the red alder plantation version of ORGANON. College of Forestry, Oregon State University, Corvallis, OR. Forest Biometrics Research Paper 1.. https://cips.forestry.oregonstate.edu/sites/default/files/Development%20and%20Evaluation%20of%20RAP-ORGANON%20%281%29.pdf
  • Hann, D W, Mainwaring, D B, Bluhm, A A (2023). Updates for Selected Equations in the Red Alder Plantation Version of ORGANON. College of Forestry, Oregon State University, Corvallis, OR. Forest Biometrics Research Paper 6.. https://archive-cips.forestry.oregonstate.edu/sites/cips/files/Updated%20ORGANON%20Red%20Alder%20Publication%20FBRP%20%236.pdf
  • Moreno-Fernández, D., others (2025). Structural diversity indices in managed forests.
  • Omoro, L. M. A., Starr, M., Pellikka, P. K. E. (2010). Tree biomass and soil carbon stocks in Taita Hills, Kenya. African Journal of Ecology.
  • Simpson, E. H. (1949). Measurement of Diversity. Nature, 163, 688.
  • Ulanowicz, R. E. (2001). Information theory in ecology. Computers & Chemistry.
  • Varga, P., Chen, H. Y., Klinka, K. (2005). Tree-size diversity in progression of stand development in Douglas-fir forests. Forest Ecology and Management.