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Notes: Spatial Autocorrelation of Diameter and Height Increment Predictions from Two Stand Simulators for Loblolly Pine

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Using Moran indices, the spatial autocorrelation properties of diameter and height increment prediction from two loblolly pine stand simulators, TRULOB and PTAEDA2, were examined. Preliminary results indicated that the distance-dependent stand simulator (PTAEDA2) generated more desirable error structures, i.e., less spatially dependent, than the distance independent stand simulator (TRULOB) did both for total height and for dbh (diameter at breast height). The distribution of autocorrelation test statistics was positively shifted and positively skewed, possibly due to the lack of ability to account for microsite variation with both simulators. The dbh projection residuals were less desirable than the total height projection residuals, which might be explained by the modeling approach of these two models. The increments of total height were clearly spatially correlated, while those of dbh were mostly uncorrelated, except in a few cases. For. Sci. 40(2): 349-356.

Keywords: Competition indices; Pinus taeda; growth and yield models

Document Type: Miscellaneous

Affiliations: Thomas M. Brooks Professor of Forest Biometrics, Department of Forestry, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0324

Publication date: May 1, 1994

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