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Establishment of Tree Volume and Aboveground Biomass Equations for Masson Pine Plantation in Guizhou Province Studies on the Estimate Method for Average Stem Density Using Linear Mixed Model and Dummy Variable Model Approaches to Construct Generalized Single-Tree Biomass Equations in Guizhou Compatible Tree Volume and Aboveground Biomass Equations of Chinese Fir in China Research on the Use of Dummy Variables Method to Calculate the Family of Site Index Curves Variable-Exponent Taper Models for Dahurian Larch in Different Regions of Daxing‘anling