Skip to Main Content
Assessing age- and silt index-independent diameter growth models of individual-tree Southern Appalachian hardwoodsAuthor(s): Henry W. Mcnab; Thomas F. Lloyd
Source: Proceedings First International Conference on Measurements and Quantitative Methods and Management & The 1999 Southern Mensurationists Meeting. p 172-189
Publication Series: Miscellaneous Publication
PDF: View PDF (1020 KB)
DescriptionModels of forest vegetation dynamics based on characteristics of individual trees are more suitable to predicting growth of multiple species and age classes than those based on stands. The objective of this study was to assess age- and site index-independent relationships between periodic diameter increment and tree and site effects for 11 major hardwood tree species. Model formulations of western conifers were evaluated by multiple regression for significance of three types of variables affecting diameter growth: tree size, competition, and site effects. Many variables were highly correlated with diameter growth but were also intercorrelated. Importance of size or competition variables differed by species and parsimonious models of highly significant (p<0.01) variables explained an average of 60% of the total variation associated with diameter increment. One or two topographic or geographic site-effect variables were significant in models for seven species. but accounted for little (<5%) variation. Detailed evaluation of a yellow-poplar (Liriodendron tulipifera) model indicated prediction errors were not correlated with tree size. Stand age, or site index. Validation testing of the yellow-poplar model with independent data suggested prediction errors were uniformly distributed, but strongly biased. Unexplained bias was associated mostly with tree size. The formulation of diameter growth models for western conifer species is appropriate for eastern hardwoods, but reasons for the unexplained bias should be addressed.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationMcnab, Henry W.; Lloyd, Thomas F. 1999. Assessing age- and silt index-independent diameter growth models of individual-tree Southern Appalachian hardwoods. Proceedings First International Conference on Measurements and Quantitative Methods and Management & The 1999 Southern Mensurationists Meeting. p 172-189
Keywordsaccuracy, bias, competition, deciduous trees, diameter growth models, height-diameter relationships, validation
- Geologic Variable Associated with Height of Yellow-Poplar Stand in the Bald Mountains of North Carolina
- Growth and Development of Yellow-Poplar Plantations On Three Sites Ranging From 9 to 18 Years
- Effects of uneven-aged and diameter-limit management on West Virginia tree and wood quality
XML: View XML