FIGURE C-1 - STANDS THAT MEET THE GREEN ET A DEFINITION FOR OLD GROWTH 



T24N, R17W 



LEGEND 



»— ProjictAre&BoundBxy 

 Stud Koiriwr 



PropoiedSalva.ge in 

 Old Growth 



IZZI 

 30 



Old Growth with no 

 Proposed Salv&ga 



Section Nuraber 



A 



N 



Based on the above estimates, the 

 amount of naturally (historically) 

 occurring old growth in Swan River 

 State Forest could range from 29 to 

 52 percent . 



About 34 percent (12,626 acres) of 

 forested acres in Swan River State 

 Forest are identified as old growth. 

 Approximately 672 acres of the 

 project area is old growth. 



Analysis Methods 



DNRC uses criteria from Green et al 

 to define old growth. The 

 definition sets minimum thresholds 

 for the number and size of large 

 trees based on habitat type and 

 covertype for labeling a stand as 

 old growth. According to 

 information in the SLI database, 

 many stands have been identified as 

 old growth. As part of the field 

 reconnaissance for this project, 

 stands labeled as old growth in the 

 SLI database, or those in question. 



were field checked to verify that 

 they met the Green et al definition. 



Old-Growth Attributes within the 

 Project Area 



Background 



Because the old-growth definition 

 only identifies old-growth stands, 

 but does not classify them further, 

 DNRC has developed an index of 'old 

 growthedness' based on SLI data that 

 further describes old-growth- stand 

 attributes. This index is called 

 the Full Old Growth Index (FOGI) . 

 For this analysis the index will be 

 used to display changes to old- 

 growth stands . 



Methods 



Attribute levels for old-growth 

 stands on Swan River State Forest 

 were assessed using FOGI. Since 

 old-growth acres would not be 

 changed, this analysis displays how 

 attribute levels would be affected 

 by each alternative. 



Page C-8 



Vegetation Analysis 



