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FOREST RESOURCES WANAGEMENT ›› 2010, Vol. 0 ›› Issue (2): 62-68.

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Individual-tree Diameter Growth Model for Platycladus orientalis Plantation in Beijing Area

DUAN Jie1, MA Luyi1, XUE Kang2, WANG Jinzeng2, DING Xiangyang1,3, ZHANG Bo1   

  1. 1. Key Laboratory for Silviculture and Conservation of the Ministry of Education, College of Forestry, Beijing Forestry University, Beijing 100083, China;
    2. Beijing Forest Surveying and Planning Institute, Beijing 100029, China;
    3. Henan Academy of Forestry, Zhengzhou 450003, China.
  • Received:2009-12-11 Revised:2010-03-23 Published:2020-12-14

Abstract: Growth model was widely used for researching growth habit of trees and forest management.4 continous forest inventories, data of Platycladus orientalis plantation in Beijing area were used for this study.The data collected from a total of 26 fixed-plots and 1172 individual trees were used for modeling 3 types of tree diameter growth.The model independent variables contained tree growth factors,site factors and competition factors.Effect of multi-collinearity among in the independent variables were also considered and those independent variables which had serious multi-collinearity relationship problem were rejected.The 3 types of models passed the test of variance analysis,homogeneity test of variances and residual normality test.Test of model predictive effect was used for the validation database and the result indicated that the observed values and the predicting values have no significant difference.All types of individual tree models can predict the diameter growth of Platycladus orientalis plantation accurately.

Key words: Beijing area, Platycladus orientalis plantation, diameter growth model, multi-collinearity, correlation analysis, forest inventory

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