USDA Forest Service

Pacific Southwest Research Station


Pacific Southwest Research Station
800 Buchanan Street
West Annex Building
Albany, CA 94710-0011

(510) 559-6300

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.

Programs and Projects


Ecology and Management of Western Forests Influenced by Mediterranean Climate

[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 

Martin W. Ritchie

Last Modified: Jun 25, 2008 06:23:38 PM