Applications of structural equation model in the management of Larix principis-rupprechtii plantations

A better understanding of the relationship between structural factors of stand, site factors and stand density factors is important for us to improve the management measures. We processed data by using SPSS17.0 and AMOS7.0 statistical software. The elevation is the major environmental factor affecting the growth of larch plantations, and its correlation coefficients with average basal diameter is 0.51, 0.54 with average DBH, 0.59 with mean height and 0.62 with basal area, all at a significant level of P0.05. By applying a cross product covariance matrix of observed variables, we established a structural equation model for larch plantations. The correlation coefficient between each factor and forest structural factors, site factors and stand density factors as well as latent variables are 0.863, 0.681, and 0.706, respectively. Validation of the indices in the model shows that the model fits well. Our analysis of the model provides scientific evidences for sustainable management of Larix principis-rupprechtii plantations in North China. The application of the model should be based on the improvement of site quality, and coordinating the relationship between forest structural factors, site factors and stand density factors.