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- Title
Stand density index in uneven-aged ponderosa pine stands .
- Authors
Woodall, C.W.; Fiedler, C.E.; Milner, K.S.
- Abstract
Reports that the stand density index (SDI) was developed to quantify relative stand density in even-aged stands. Application of SDI in uneven-aged stands that has been described mathematically but not justified biologically; Diameter-class trends in SDI and sapwood area across uneven-aged ponderosa pine (Pinus ponderosa Dougl. ex P. & C. Laws.) stands in eastern Montana that were examined to elucidate the biological underpinnings of the SDI summation method; Results that indicate that the SDI summation method is biased in its apportionment of relative stand density across diameter classes in uneven-aged ponderosa pine stands; SDI that may overpredict site occupancy for reverse J-shaped diameter distributions with more small trees than large ones, and that it may underpredict occupancy with nonreverse J-shaped diameter distributions; Application of the SDI summation method in uneven-aged ponderosa pine stands that may be biologically justified only if site occupancy ? diameter-class trends are taken into account when interpreting SDI values; Replacing the self-thinning scaling factor of the SDI summation method with more biologically relevant scaling relationships that may create improved relative density measures for uneven-aged stands.
- Subjects
MONTANA; UNITED States; PONDEROSA pine; PINE; TREES
- Publication
Canadian Journal of Forest Research, 2003, Vol 33, Issue 1, p96
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/x02-168