四川桤木纸浆材耐干旱优良家系选择初探

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(1.60 m),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1.73 m,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。

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

There was obvious difference in the survival rates of afforestation of Alnus 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 Luminifera,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.