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Maximum SDI Values

Stand Density Index

Stand density index (SDI) is a relative measure of stand desnity the converts a stand's current density into a density at a reference size. Stand density index was present by Reineke (1933) and can be defined as:

Stand Density Index formula

where SDI is Stand Density index, Dq is the quadratic mean diameter. Quadratic mean diameter is the diameter of average basal area per tree. A number of maximum stand density indices have been proposed for various species. Table 1 list these stand density indices by species and source.

Table 1. Suggested Maximum SDI by species and source. English units are number of
10-inch trees per acre. Metric units are number of 25.5cm trees per hectare.

Species Maximum SDI
(English)
Maximum SDI
(metric)
Source
White fir
830
2050
Reineke, 1933
Red fir
1000
2470
Reineke, 1933
Mixed conifer for CA
750
1850
Reineke, 1933
Douglas-fir for WA-OR
595
1470
Reineke, 1933
Douglas-fir for CA
600
1480
Reineke, 1933
Eucalyptus
490
1210
Reineke, 1933
Redwood
1000
2470
Reineke, 1933
Ponderosa Pine
800
1980
Reineke, 1933
Loblolly Pine
450
1110
Reineke, 1933
Longleaf Pine
400
990
Reineke, 1933
Slash Pine
400
990
Reineke, 1933
Shortleaf Pine
400
990
Reineke, 1933
Upland Oak
230
570
Schnur, 1937
Ponderosa Pine
830
2050
Long, 1985
Lodgepole pine
690
1700
Long, 1985
Douglas-fir
587
1450
Long, 1985
Western Hemlock
790
1950
Long, 1985
Ponderosa Pine
450
1110
Long and Shaw, 2005

References

Long, J. N. 1985. A pratical approach to density management. Forest Chronicle 61:23-37.

Reineke, L. H. 1933. Perfecting a stand density index for even-aged forests. Journal of Agricultural Research 46(7):627-638.

Schnur, G. L. 1937. Yield, stand, and volume tables for even-aged upland oak forests. USDA Technical Bulletin No. 560, 87p.


Created: July 11, 2001, By David R. Larsen
Last Updated: February 7, 2007