Pacific Southwest Research Station

Requirements: 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. 

Species:

• 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 

Features:

• 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 

Contact
Martin W. Ritchie