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- W2990472237 abstract "To improve the forest production mode of Cunninghamia lanceolata artificial and natural forests in Hunan Province, their height-diameter curves were studied. Based on periodic inventory data of C. lanceolata in Hunan, six common empirical models were used to fit height-growth and diameter-growth curves, and selected the best one from them. On the basis of the optimal model, differences in stand origin were considered and compatible height-diameter curve equations for a group of stands with different stand origins were built by introducing dummy variables and using the measurement error model method. These growth status for stand in different origins were compared and analyzed by drawing scatter plots. Results showed that the fitted coefficient of determination for the C. lanceolata height-growth model with the dummy variables was better than this without dummy variables. The fitted coefficients for the tree diameter-growth curve was 0.820 5 with prediction accuracy of 98.30%, and for tree height was 0.758 0 with prediction accuracy of 98.01%. Also, DMAD and ERMSE indicators were superior to the traditional methods. The growth progress of C. lanceolata artificial and natural forests were the same; however, in the young stage, tree height and diameter growth rate of the artificial forest were higher than the natural forest. Moreover, tree height and diameter in the artificial forest reached a maximum value earlier than in natural forests. In conclusion, the model of tree height growth was established using the model with dummy variables, which not only improved the accuracy of the model but also solved the problem of incompatibility between models." @default.
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- W2990472237 date "2017-12-20" @default.
- W2990472237 modified "2023-09-23" @default.
- W2990472237 title "Compatibility of height-diameter curve equations for Cunninghamia lanceolata stands in Hunan Province" @default.
- W2990472237 doi "https://doi.org/10.11833/j.issn.2095-0756.2017.06.012" @default.
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