Study on Modelling of Site Quality Evaluation and Its Dynamic Update Technology for Plantation Forests
Yanrong Guo, Yanyun Han, Baoguo Wu and Yang Liu
Journal Title:Nature Environment and Pollution Technology
Differential site index models were constructed using both the algebraic difference approach (ADA) and the generalized algebraic difference approach (GADA) in this study to evaluate the site quality of forest land without the site index table. Data related to China fir (Cunninghamia lanceolata (Lamb.) Hook.) were selected to fit the differential site index models and then the optimal model was chosen. The optimal model was determined using an accuracy test and residual analysis, and then the dynamic update technique of the optimal model was studied by MATLAB and .NET. The results showed that Richards’ differential site index model (SI = 19.171 × (Ht /19.171)ln(1-exp(-0.067×20))/ln(1-exp(-0.067 At))) had the best prediction performance. The ADA and GADA could be used to evaluate site quality without the site index table and the differential site index model could provide prompt dynamic updates.