中文摘要：

目的：建立用主成分分析法选择毛叶木姜子优良单株的方法,确定其优树选择标准,为毛叶木姜子早期实生选优、良种选育提供理论依据。方法：以重庆万州实生起源的毛叶木姜子人工林为研究对象,采用5株优势木对比法初选72株优树,观测其生长性状和经济性状,并对其进行变异分析、主成分分析。结果：经变异分析可知,各性状间存在丰富的变异。经主成分分析得知,把树高、冠幅面积、东西冠幅、南北冠幅、胸径这5个性状作为其选优的标准;选出4株综合经济性状表现优良的单株,即Y12-4、Y12、Y11-3、Y10。结论：毛叶木姜子丰富的变异性为优树选择提供了前提;研究结果与植株的实际表型相符合,表明采用的方法具有一定的科学性和可行性。

英文摘要：

Objective： To establish a principal component analysis（ PCA） method for selecting Litsea mollis,to determine the selection criteria,in order to provide a theoretical basis for the early excellenting,selective breeding of Litsea mollis. Methods： The seedling origin of Litsea mollis plantion in Wanzhou district of Chongqing province were used as the research object,72 plus trees were selected by using 5 dominant comparative method. Its growth and economic traits were observed and analyzed by variance analysis and PCA method. Results： The variatice analysis result showed that the traits existed rich genetic differences. The PCA analysis result showed that in rotated component matrix,tree height,crown area,east-west crown,north-south crown,diameter at breast height were used as the selection optimal criteria of Litsea mollis. Four plants with superior integrated economical were selected,which namely Y12-4,Y12,Y11-3and Y10. Conclusion： The rich variability of Litsea mollis provide the prerequisite condition for plus tree selection. The resluts conform to the phenotypic and indicate that the optimization methods are scientific and feasible.