Abstract:

Larix gmelinii in Daxing’anling forest area,as a constructive species,is expanding its area of plantation resources,which has become an effective supplement to forest resources in Daxing’anling forest area.In this paper,based on the original data of stem analysis compiled by Inner Mongolia Second Forestry Survey and Design Institute,SPSS 19.0 data statistical software was used to fit tree growth equation.The tree growth models of tree height and DBH of Larix gmelinii plantation were established and the two models were tested and evaluated,and it was found that their regression coefficients (R²),mean square errors (MSE) and fitting efficiencies (EF) were all in accordance with the model test criteria,proving that the models have high stability and estimability.The results showed that the height growth model of Larix gmelinii plantation is H=22.588(1-e^-0.032t);the DBH growth model of Larix gmelinii Plantation is D=26.94$e^{-\frac{9.83}{t}}$.

Key words: Larix gmelinii plantation, tree height, diameter at breast height, growth model, model fitting and validation