Application of PCA & Multiple-scoring in Selecting Plus-tree of Straight-stem Acacia auriculiformis

A total of ten potential Plustrees have been primarily classified in 20 hm2 of 5 to 8-year plantation of Acacia auriculiformis in Jianfengling and Qionghai, Hainan Island,based on field-survey carried out in 1992 and 1993.The main indices recorded in survey included height and diameter in breast height growth, stem-form,crown broadth,health conditionand some features else of plus-tree. The obtained data were processed in STAT and analyzed with method of PCA, DA and MS in order to justify which factor would play more important role in plus-tree selection. The result demonstrated that growth difference among plus-trees,the dominants and single tree of each kind would exist in some content to a significant level,and that those factors concerned growth and stem-form of tree were of minor importance.As for primary criteria for further selection, overall scores of plus-tree should exceed 52,and its H & DBH growth should be 10%～15% larger than those of the dominant and 15%～30% larger than those of the forest.