Generalized Algebraic Difference Site Index Model for Ponderosa Pine in British Columbia,Canada  

作　　者：Zhao Lei Ni Chengcai Gordon Nigh 

机构地区：[1]College of Forestry,Beihua University [2]Institute of Forest Resources Information Techniques,Chinese Academy of Forestry

出　　处：《Chinese Forestry Science and Technology》2012年第3期61-62,共2页中国林业科技（英文版）

摘　　要：Based upon 3 widely used base models, a total of 8 ADA/GADA site index models were derived.The data for these models in this study were obtained from 79 pith-split stem analysis plots and the estimation method was "indicator variable approach".We used both fit statistics and visual analysis to select the best-fit model,and attached more importance to the visual analysis.A comprehensive application analysis was also given to the selected model.The results showed:1) GADA outperformed ADA with respect to predictions.2) A GADA model derived from HossfeldⅣpresented the best prediction ability.It was suggested that the model be used to predict dominant height and to estimate site index for ponderosa pine stands ranging 30 -200 years in British Columbia,Canada.3) The best site index age was age of 100 years,based upon relative errors of predictions.Based upon 3 widely used base models, a total of 8 ADA/GADA site index models were derived.The data for these models in this study were obtained from 79 pith-split stem analysis plots and the estimation method was "indicator variable approach".We used both fit statistics and visual analysis to select the best-fit model,and attached more importance to the visual analysis.A comprehensive application analysis was also given to the selected model.The results showed:1) GADA outperformed ADA with respect to predictions.2) A GADA model derived from HossfeldⅣpresented the best prediction ability.It was suggested that the model be used to predict dominant height and to estimate site index for ponderosa pine stands ranging 30 -200 years in British Columbia,Canada.3) The best site index age was age of 100 years,based upon relative errors of predictions.

关 键 词：SITE INDEX model GENERALIZED ALGEBRAIC DIFFERENCE approach PONDEROSA pine SITE INDEX age 

分 类 号：S7[农业科学—林学]