Stand Density Index

The stand density index ( SDI) is a measure of the degree of concentration in the forestry sector, which was developed by Reineke in 1933 in the United States. He had observed that unstaffed and vollbestockte forests of a particular tree species, regardless of age and income class achieve the same number of trees per unit area, if they have the same mean diameter. Used as the reference base Reineke a diameter of 10 inches.

The SDI have transferred to the Metric and a mean diameter of 25 cm was used as a reference scale and Daniel Sterba. The formula is:

In which

  • N = number of stems / ha
  • Dg = circular area means tribe cm