明于阴阳-中医的概念与逻辑.pdf

明于阴阳-中医的概念与逻辑 第 26 卷第 2 期桉树科技 Vol. 26 No. 2
2009 年 12 月 EUCAL YPT SCIENCE & TECHNOLOGY Dec. 2009
不同林分密度桉树幼林抗风性比较研究
张华林, 谢耀坚* , 李天会, 吴志华
(国家林业局桉树研究开发中心, 广东湛江 524022)
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摘要: 通过对两种1年生桉树无性系(巨细桉 DH 20 1 - 2与尾巨桉 DH3 2 - 2 9 ) 6种林分密度( 1250株· hm 、1667株· hm 、
2500 株· hm - 2 、5000 株· hm - 2 、6667 株· hm - 2 、10000 株· hm - 2) 进行生长量、根系和风害的调查,并分析林分密度、
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生长量和根系与抗风性相关性,结果表明: DH2 01 - 2 以林分密度 1667 株· hm 的生长量最大,而 DH3 2 - 2 9 胸径和冠幅
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以 1667 株· hm 最大、树高以 5000 株· hm 的最高; 两个无性系间各个密度生长量差异显著; DH2 01 - 2 以密度
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2500 株· hm 的抗风性最好, DH32 - 29 6 个密度的抗风性均较差; 相同林分密度下 DH20 1 - 2 根总数与根直径在 0~2
cm 的根数显著比 DH32 - 29 多,DH32 - 29 冠幅显著比 DH20 1 - 2 大,因此 DH20 1 - 2 易断干,而 DH32 - 29 易倒伏;相同林分密度下
DH201 - 2 比 DH32 - 29 抗风性强。
关键词: 桉树无性系; 林分密度; 生长量; 根系; 抗风性
中图分类号: S753. 3 文献标识码: A
Study on Wind - r esistance of Young Eucalypt Plantat ion
at Differ ent Stand Density
ZHANG Hua - lin ,XIE Yao - jian ,LI Tian - hui ,WU Zhi - hua
( China Eucalypt Research Centre , Zhanjiang 524022 , Guangdong , China)
Abstra ct : Growth , root and wind damage of two one - year - old eucalyptus clones( Eucalypt us grandis ×
E. tereticornis clone DH201 - 2 and E. urophylla ×E. g randis clone DH32 - 29) were studied in six stand densities
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( 1250 , 1667 , 2500 , 5000 , 6667 and 10000 trees · hm ) , and correlation analysis stand density ,
growth , root and wind resistance was carried out. The results showed that DH201 - 2 had the maximum growth
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at density of 1667 trees · hm , diameter at breast height and crown of DH32 - 29 were the best at density of
1667 trees · hm - 2 while the tree height was the highest at density of 5000 trees · hm - 2. Growth of two clones
at various densities were significantly different ; 2500 trees · hm - 2 was the best density on wind - resistance
for DH201 - 2 ,whilst DH32 - 29 of six densities all were not ideal ; In the same density , the total root number and
the root number from 0 to 2 cmof DH201 - 2 were more than that of DH32 - 29 ,bu