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Table 4 Environmental predictor variables used to determine stratification units at DF49, HDF88, and HDF00

From: Comparison of carbon-stock changes, eddy-covariance carbon fluxes and model estimates in coastal Douglas-fir stands in British Columbia

Coverage Variable Units DF49 HDF88 HDF00
Forest-Inventory Site Index1 m selected   
Top Height m    
Disturbance History (Trofymow et al. 2008) 1st Harvest year    
2nd Harvest year    
1st Fire year    
2nd Fire year    
Date Est. 1953 year    
Date Est. 2003 year    
1st Fertilization year    
2nd Fertilization year    
Fire Cause 1 nominal    
Fire Cause 2 nominal    
Topography3 aspect azimuth selected selected selected
Elevation m asl    selected
Slope degrees selected selected selected
SCOSA2    selected selected
SSINA2    selected selected
TSRAI2   selected selected selected
1999 Orthophoto Dominant Canopy Tree Density stems ha−1 selected selected  
(Gougeon 1995)
2004 Multispectral4 NDVI NDVI selected   selected
Forest-Inventory Cover Species     
(Trofymow et al. 2008)
Site Species     
Soil Survey of Canada (Jungen 1985) Most Common Soil Association     
CFS and Forest Companies Site Series   selected selected  
(Trofymow et al. 2008)
  1. 1Site Index: Tree height at 50 years age at breast height (1.3 m).
  2. 2Topographic Variables: SCOSA = Slope × cos (Aspect), SSINA = Slope × sin (Aspect); TSRAI (Topographic Solar Radiation Aspect Index) = (1-cos((π/180°)(Aspect-30°)))/2 (Roberts and Cooper 1989).
  3. 3Topography from 2004 LiDAR survey at DF49 and HDF00 (Coops et al. 2007). Topography from 1:50,000 National Topographic Series map at HDF88.
  4. 4Multispectral data from 2004 Quickbird survey at DF49 and HDF00. Multispectral data from 2004 Landsat scene at HDF88.