USDA Forest Service

Pacific Southwest Research Station

Pacific Southwest
Research Station

1731 Research Park Dr.
Davis, CA 95618
(530) 759-1700
United States Department of Agriculture Forest Service. USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.

Research Topics Forest Management

Participating Programs
Related Links

Conifers - A young stand model for Northern California and Southern Oregon[image:] Conifers Title



Microsoft Windows 95 or later operating system. Internet Explorer 5 or later version required for the help system.

Site Productivity:

Site water holding capacity and mean annual precipitation. Optionally, height of Dominant Trees (Douglas-fir or ponderosa pine) at a total age of 50 years.

Primary Growth Function:

Height growth.

  • Primary coniferous tree species: Douglas-fir and ponderosa pine
  • Secondary coniferous tree species: white fir, sugar pine, incense-cedar
  • Primary hardwood tree species: tanoak, Pacific madrone, golden chinkapin
  • Secondary hardwood tree species: Oregon white oak, California black oak
  • Primary shrub species: deerbrush, snowbrush, greenleaf and whiteleaf manzanita
  • Secondary shrub species: ribes, California hazel, oceanspray
  • Data Editor
  • Allows input of competing vegetation at the plot-level or at the plant-level.
  • Online user's guide and context-sensitive help system.
  • User-Defined species codes
  • Opens multiple files simultaneously
Stochastic Components:
  • A random damage process
  • A random component to the prediction of crown recession
  • A random mortality component
  • A random error component on height growth coupled with a plot duplication scheme
Output Format:

ORGANON, FVS, CACTOS. Also produces plot-level and stand-level summaries to the screen which may be exported to spreadsheet files.

Recognized Input Format:

SYSTUM-1, Free format tree list (ORGANON), and spreadsheet data may be imported to the data editor.

Required Tree Input:
  • Plot number
  • Species
  • Height
  • Expansion factor or plot design
Recommended Tree Input:
  • Diameter (breast height and/or basal diameter)
  • Crown Width
  • Crown Ratio
Required Minimum Shrub Input (plot-level summaries):
  • Plot Number
  • Species
  • Percent Cover
  • Height
Alternate, Plant-level Shrub Input:
  • Plot Number
  • Species
  • Height
  • Crown Width (optional)
  • Basal Diameter (optional)
  • Expansion factor or plot design
Management Options:
  • Precommercial Thinning
  • Competing Vegetation Release