A topographic index to quantify the effect of mesoscale and form on site productivity

  • Authors: McNab, W. Henry
  • Publication Year: 1992
  • Publication Series: Miscellaneous Publication
  • Source: Can. J. For. Res. 23: 1100-1107

Abstract

Landform is related to environmental factorsthat affectsite productivity in mountainous areas. I devised a simple index of landform and tested this index as a predictor of site index ín the Blue Ridge physiographic province. The landform index is the mean of eight slope gradients from plot center to skyline. A preliminary test indicated that the index was significantly associated with slope position and three classes of landform (ridge, slope, and cove). In a test with data from four locations, site index of yellow-poplar (Liriodendron tulipifera L.) was significantly correlated with landform index for each location (r = 0.45-0.65). Landform index and two other topographic variables together accounted for 31 percent of the variation in yellow-poplar site index throughout the Blue Ridge province. Landform index is a conveniently measured site variable that may be useful in various forestry-related applications, including multivariate analysis of the distribution and composition of forest vegetation.

  • Citation: McNab, W. Henry 1992. A topographic index to quantify the effect of mesoscale and form on site productivity. Can. J. For. Res. 23: 1100-1107
  • Posted Date: April 1, 1980
  • Modified Date: August 22, 2006
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