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https://knowledgecommons.lakeheadu.ca/handle/2453/2153
Title: | Height growth and site index of trembling aspen in north central Ontario |
Authors: | Deschamps, Kerry C. |
Keywords: | Aspen Ontario;Site index (Forestry) Ontario;Polymorphism;Stem analysis;Non-linear regression |
Issue Date: | 1991 |
Abstract: | Height-growth and site-index curves were developed for estimating site quality of trembling aspen {Populus tremuloides Michx.) in north central Ontario. These curves were developed from stem analysis data of dominant and codominant, uninjured aspen trees obtained from 89 plots covering a wide range of site quality in north central Ontario. The actual height-growth patterns were modelled using several non-linear biological growth models: Chapman - Richards function, modified Weibull function, Monserud logistic function and an expansion of the Chapman - Richard function. In addition, a new height-growth model was developed using a similar approach to that of Cieszewski and Bella. Height-growth patterns of aspen varied with level of site-index. Height growth curves show an almost linear growth pattern for poor sites (SI < 16 m) to a highly curvilinear pattern on good sites (SI > 24 m). Medium sites (S116-24 m) show a rapid linear surge of height growth before 40 years followed by a slowing curvilinear pattern. Height-growth curves, site-index curves and a site-index prediction equation were constructed from trembling aspen stem analysis data. Goodness of fit tests were computed using a modified Chi-square test. In addition, the accuracy of the height-growth curves, site-index curves and site-index prediction equation were tested using independent stem analysis data from 19 plots supplied by the Ontario Ministry of Natural Resources. Comparisons with the independent data source shows close agreement; the 95% site index error prediction interval for the site-index curves and the site-index prediction equation are 0.19 ± 1.37 and 0.21 ± 1.35 respectively. |
URI: | http://knowledgecommons.lakeheadu.ca/handle/2453/2153 |
metadata.etd.degree.discipline: | Forestry and the Forest Environment |
metadata.etd.degree.name: | Master of Science |
metadata.etd.degree.level: | Master |
metadata.dc.contributor.advisor: | Carmean, Willard H. |
metadata.dc.contributor.committeemember: | Hazenberg, G. Benson, C. |
Appears in Collections: | Retrospective theses |
Files in This Item:
File | Description | Size | Format | |
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DeschampsK1991m-1b.pdf | 10.3 MB | Adobe PDF | ![]() View/Open |
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