利用层次-灰色关联法综合评价矮灌型紫薇优良单株

Comprehensive evaluation of superior individuals of dwarf crape myrtle using hierarchy-gray correlation method

以110株紫薇(Lagerstroemia indica L.)种内杂种子代为试验材料,以培育矮灌型紫薇为目标,选取着花密度、花序长、花序宽、花径、花色、花期、株型、株高、冠幅、生长势、抗病能力等11个指标,采用灰色关联法和层次分析法相结合的方法,构建矮灌型紫薇观赏性状评价体系。利用层次分析法确定各评价指标的权重值,依据灰色加权关联度值将供试单株分成4个等级,优选出6个着花密度高、株型紧凑、花色鲜艳、综合性状优良的单株。应用该评价体系,可对矮灌型紫薇优良单株进行有效的综合评价。

For cultivating dwarf shrubby Lagerstroemia indica,selecting flower density,inflorescence length,inflorescence width,flower diameter,flower color,flowering period,plant type,plant height,crown width,growth vigor,disease resistance and other 11 indicators,the evaluation system of dwarf shrubby L.indica’s ornamental character was established by combining the grey correlation analysis method with the AHP method using 110 individual plants of hybrid offspring from the intraspecific hybridization of L.indica as materials.Based on the weight value of each evaluation index determined by Analytic hierarchy process and according to the grey corre⁃lation degree value,all the materials were divided into 4 grades and 6 plants with the good comprehensive characters including dense flowers,good shape,bright and pure color were picked out.The evaluation system can be used to evaluate the dwarf shrubby L.indica’s ornamental characters effectively,and this provided a scientific method for selection breeding.