Notes: A Modified Growth Intercept Method for Predicting Site Index in Young White Pine Stands
Authors: Brown, James H.; Stires, James L.
Source: Forest Science, Volume 27, Number 1, 1 March 1981 , pp. 162-166(5)
Publisher: Society of American Foresters
Abstract:Growth intercept (GI) techniques were evaluated for estimating site quality in young Pinus strobus stands planted on old-field sites in the residual soil region of southern and eastern Ohio. Correlation between height growth of trees below breast height (BH) and height growth above BH was not statistically significant, and site index estimates were made using age at BH and height from BH to the growing tip. Five-year growth beginning 2 years above BH was significantly more closely correlated with height than was 5-year intercept beginning at BH. In equations developed for predicting site index, 5-year intercept in combination with age accounted for 73 percent of variation in height. Combining percent distance from ridge or total soil depth with GI and age increased variation accounted for by 6 and 3 percent, respectively, while including both factors in prediction equations increased variation accounted for by 9 percent. Forest Sci. 27:162-166.
Keywords: Pinus strobus
Document Type: Miscellaneous
Affiliations: Former Graduate Student, Department of Forestry, Ohio Agricultural Research and Development Center, Wooster, Ohio 44691
Publication date: 1981-03-01
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