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综合评分与PCA在直干大叶相思选优中的应用*

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

  • 摘要: 应用5株优势木法在海南岛尖峰岭和琼海的20hm2大叶相思人工林中初选出优树10株,入选率为1%,对候选优树的树高、胸径、干形、冠形和健康状况等10个因子进行测定并数量化,所得数据运用STAT程序进行方差分析和主成分分析。结果表明:优树、优势木和林分间高径生长的差异极显着,影响优树质量性状的主要因子为高径生长、干形(通直度和圆满度)及自然整枝情况。综合评分显示:优树质量性状的得分大于52,优树的高径生长应大于优势木10%和15%以上,大于林分平均生长量的15%和30%以上。

     

    Abstract: 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.

     

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