The phenotypir characteristies of the phs trees of Larix principis ruppre chtii such as stem form,branch angk,branch/stem ratio,bra nch density,the crowmn width,crown leng th,number of short branch over 5-cm branch se...The phenotypir characteristies of the phs trees of Larix principis ruppre chtii such as stem form,branch angk,branch/stem ratio,bra nch density,the crowmn width,crown leng th,number of short branch over 5-cm branch se gment in length,and the leaf number of each short branch were investigated in seed orchard in the Changcheng Mountain,Shaanxi Province.According to the morphological characteis,the phs tree clones of Lanix principis-rupprechti were classified into 4 natual types:the narrow-dense-crown type,wide-dense-crown type,wide-sparse-ciown type,and the narow-spase-crown type.The re sult ofthe cluster analysis showed there was a very significant difference in tree growth among the four na turaltypes.Whie comparingthe tree growth of four na twral types for the last ten yeas,it was found that the performance order ofvanious types fiom good toba d i as folbws:the narrow-dense crown type the wide-dense crown type the wide-spase crown type the narow-spasecrown type.The plus trees of narrow-dense-ciown,as a fine type,should be paid great attention to production and pre pared topo pula nize.展开更多
文摘The phenotypir characteristies of the phs trees of Larix principis ruppre chtii such as stem form,branch angk,branch/stem ratio,bra nch density,the crowmn width,crown leng th,number of short branch over 5-cm branch se gment in length,and the leaf number of each short branch were investigated in seed orchard in the Changcheng Mountain,Shaanxi Province.According to the morphological characteis,the phs tree clones of Lanix principis-rupprechti were classified into 4 natual types:the narrow-dense-crown type,wide-dense-crown type,wide-sparse-ciown type,and the narow-spase-crown type.The re sult ofthe cluster analysis showed there was a very significant difference in tree growth among the four na turaltypes.Whie comparingthe tree growth of four na twral types for the last ten yeas,it was found that the performance order ofvanious types fiom good toba d i as folbws:the narrow-dense crown type the wide-dense crown type the wide-spase crown type the narow-spasecrown type.The plus trees of narrow-dense-ciown,as a fine type,should be paid great attention to production and pre pared topo pula nize.
