四川桤木纸浆材耐干旱优良家系选择初探

The selection of the tolerance drought superior families of pulpwood of Alnus cremastogyne

四川桤木造林成活率的差异达到了极显著或显著水平，造林当年的家系间成活率变幅为50％～100％，平均为78．1％；存活株第2年的成活率变幅为52％～100％，平均为73．7％。2年生家系树高生长量方差分析，家系间差异有3个层次达到极显著。以树高生长量大于试验平均值（1．60m），同时成活率大于试验平均值（73．7％）进行选择，有光皮桦、19、6、4、24、10、18号家系入选，最优家系19号树高生长达到1．73m，第2年的成活率达到100％。在较干旱区域造林，要选择耐干旱的四川桤木优良家系或光皮桦。

There was obvious difference in the survival rates of afforestation of A/nus cremastogyne, the amplitude of survival rates of the families in same year was from 50% to 100%, and the average survival rates was 78.1%. The survival rates of afforestation of Alnus cremastogyne in second year was from 52% to 100%, and the average survival rates was 73.7%. The results of the variance analysis of the height growth volume of the two-year old families showed that there were obvious differences in the three levels of families. The superior families such as Betula l_aminifera, No. 19, No. 6, No. 4, No. 24, No. 10 and No. 18 were selected from the examination, which the height more than the average examination data （ 1.60 m）, and the survival rates more than the average examination data （73.7%）. The best superior family No. 19＇s height was 1.73 m , and the survival rates in the second year was 100%. For afforestation in the drought area, we should select the tolerance drought superior families of Alnus cremastogyne or Betula Luminifera.