The Western Root Disease Model predicts the spread and impact of pathogenic Armillaria app. or Phellinus weirii (Murr [Gibn.]) in mixed species, multi-aged forest stands in the western United States. The model has been enhanced to simulate bark beetle attack when designated conditions are met. Model input data requirements include sample inventories of actual stands, tree size attributes, stand area, sizes and distributions of diseased centers, and frequency of tree infection by root disease.
The frequency of tree infection by root disease is compiled by the model from disease status codes of individual sample trees, estimate-based, or independent samples from the stand. Tree size attributes, stand area, size and distributions of diseased centers are derived from field data. The model output data are summary statistics for root disease areas. A detailed output file is provided describing species, specific consequences of root disease infection on tree growth and mortality. Currently the temporal scale is 400 years. A new parallel processor will allow multiple runs simultaneously. The spatial scale is currently 300 acres, which the parallel processor would allow for increased area.
CIESIN (CONSORTIUM FOR INTERNATIONAL EARTH SCIENCE INFORMATION NETWORK):
A Model Data Needs Assessment Report CIESIN