Site-index comparisons for naturally seeded loblolly pine and shortleaf pine (1987)Harrington, C. A. (1987). Site-index comparisons for naturally seeded loblolly pine and shortleaf pine. Southern Journal of Applied Forestry, 11(2), 86-91. Retrieved from http://www.ingentaconnect.com/content/saf/sjaf/1987/00000011/00000002/art00007 Site-index comparisons were made between loblolly pine (Pinus taeda L.) and shortleaf pine (P. echinata Mill.) based on 190 plots in 9 southern states. The relationship between site-index values for the two species appeared to be linear, with the mean difference in site index greatest on poor sites and decreasing as site quality increased. Site-index prediction equations were developed for each species using site index of the other species or using site index plus one to three additional independent variables. The simple correlation between the site indexes of the two species was 0.855 (r² = 0.73). Somewhat higher correlation coefficients were obtained when elevation or slope was included as a second independent variable. Simple regression equations developed separately for plots east and west of the Mississippi River did not differ statistically. Separation of the plots into two groups, however, resulted in several multiple regression equations for each geographic division; these had slightly higher correlation coefficients than the simple regression equations
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