论文部分内容阅读
运用随机区组设计试验方法,连续观察育苗期和造林初期林木的生长情况,探讨了两个桉树无性系(巨尾桉无性系广林9号、尾巨桉无性系DH32-29以下简称无性系广9、无性系29)接种固氮菌的效应,结果表明:两种桉树无性系接种固氮菌增长效果显著。苗期试验,无性系广9及29接种后,地径分别比对照增长7.72%、20.18%,苗高增长量分别达5.02%、16.40%;造林7月龄时,接种固氮菌的的广9无性系及29无性系的地径生长量相对于对照组增长分别达35.93%、56.20%,树高增长量分别达35.74%、72.22%。统计分析结果表明:广9及29无性系接种固氮菌增长量均达显著水平,增长效果明显;其中以29无性系接种固氮菌效果较优。此外,接种固氮菌的林木还表现出一定的环境抗逆性,在遭受桉树枝瘿姬小蜂严重危害后能较快恢复生长。
Using randomized block design and experimental methods, the growth of trees in seedling stage and early stage of afforestation were observed continuously. The effects of two Eucalyptus clones (Eucalyptus grandis clone Cl. 9, DH32-29 clone Guang 9, clones 29) inoculated with nitrogen-fixing bacteria, the results showed that: two kinds of eucalyptus inoculation nitrogen-fixing bacteria growth effect is obvious. In the seedling stage, after the inoculation of clones 9 and 29, the diameter increased by 7.72% and 20.18% respectively compared with the control and the increment of seedling height reached 5.02% and 16.40% respectively. When the 7-month-old seedlings were inoculated with Azotobacter Compared with the control group, the diameter growth of clonal and 29 clones reached 35.93% and 56.20% respectively, and the tree height increment reached 35.74% and 72.22% respectively. The results of statistical analysis showed that the amount of nitrogen-fixing bacteria inoculation of 9 and 29 clones reached a significant level, and the growth effect was obvious. Among them, inoculation of nitrogen-fixing bacteria with 29 clones was better. In addition, the nitrogenous bacteria inoculated with nitrogen-fixing bacteria also showed a certain degree of environmental stress resistance, which could recover rapidly after suffering serious damage from the Eucalyptus branches.