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A mixed-effects height-diameter model for cottonwood in the Mississippi DeltaAuthor(s): Curtis L. VanderSchaaf; H. Christoph Stuhlinger
Source: In: Butnor, John R., ed. 2012. Proceedings of the 16th biennial southern silvicultural research conference. e-Gen. Tech. Rep. SRS-156. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 352-358.
Publication Series: Paper (invited, offered, keynote)
Station: Southern Research Station
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DescriptionEastern cottonwood (Populus deltoides Bartr. ex Marsh.) has been artificially regenerated throughout the Mississippi Delta region because of its fast growth and is being considered for biofuel production.This paper presents a mixed-effects height-diameter model for cottonwood in the Mississippi Delta region. After obtaining height-diameter measurements from the plot/stand of interest, a mixed-effects model can be calibrated often improving height estimates relative to an uncalibrated fixed-effects model. When using an independent validation dataset, the calibrated mixed-effects height-diameter model vastly improved height predictions compared to a completely fixed-effects model. When using only one tree in calibration, bias decreased from -1.1164 m to -0.1334 m while the mean square error (MSE) decreased from 2.3421 to 0.4869 for the fixed-effects and mixed-effects models, respectively. When using three trees in calibration, the bias and MSE were reduced to -0.0495 m and 0.3012. The use of three trees in model calibration will likely provide a reasonable compromise between predictive ability and field sampling times.
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CitationVanderSchaaf, Curtis L.; Stuhlinger, H. Christoph. 2012. A mixed-effects height-diameter model for cottonwood in the Mississippi Delta. In: Butnor, John R., ed. 2012. Proceedings of the 16th biennial southern silvicultural research conference. e-Gen. Tech. Rep. SRS-156. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 352-358.
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