摘要
以60株2年生欧美杨107杨为研究对象,在生长季节开展人工倾斜树干试验,将苗木分成5组(每组12株)与垂直方向倾斜成不同的角度(0°,15°,30°,45°和60°),苗木生长4个月后开始在树干最外围年轮次生木质部取样,分应拉区和对应区对其微纤丝角、基本密度和轴向干缩率进行测定分析。结果表明:1)随着倾斜角度的增加,应拉区和对应区微纤丝角均呈递减趋势,应拉区微纤丝角比对应区小,方差分析表明不同倾斜角度和区域对微纤丝角影响显著;2)随着倾斜角度的增加,应拉区基本密度呈增大趋势,对应区基本密度先增大后略有减小,应拉区比对应区基本密度大5.7%～14.4%,方差分析表明不同区域对基本密度影响显著,不同倾斜角度和角度与区域交互作用对其影响不显著;3)随着倾斜角度的增加,应拉区轴向干缩率先增大后减小,对应区呈减小趋势,应拉区轴向干缩率是对应区的1.0～2.0倍,方差分析表明不同区域对轴向干缩率影响显著,不同倾斜角度和角度与区域交互作用对其影响不显著;4)应拉区和对应区轴向干缩率与微纤丝角之间均呈负相关,应拉区和对应区轴向干缩率与基本密度之间均呈负相关。
Sixty two-year-old saplings of poplar ＇Ⅰ-107＇（Populus× euramericana ＇Neva＇）which were divided into five groups were planted in spring and artificially inclined at the angles of 0°,15°,30°,45°and 60° from the vertical.The samples were collected from secondary xylem of the last growth ring after four months growth and separated as tension wood area（TW）and opposite wood area（OW）.Then the microfibril angle,basic density and longitudinal shrinkage were analyzed.The following conclusions were drawn：1）Along with the increase of inclined angles,microfibril angle of tension wood area and opposite wood area all decreased,the values of tension wood area were smaller than those of opposite wood area.The ANOVA results revealed that there were significant effects of inclined angle and area.2）Along with the increase of inclined angles,basic density of tension wood area increased,those of opposite wood area increased first and then decreased little.The values of tension wood area were 5.7%-14.4% bigger than those of opposite wood area.The ANOVA results revealed that there were significant effects of area;there weren＇t significant effects of inclined angle and the interaction between inclined angle and area.3）Along with the increase of inclined angles,longitudinal shrinkage of tension wood area increased first and then decreased later,those of opposite wood area decreased.The values of tension wood area were 1.0-2.0 times bigger than those of opposite wood area.The ANOVA results revealed that there were significant effects of area;there weren＇t significant effects of inclined angle and the interaction between inclined angle and area.4）For tension wood area and opposite wood area there were negative relationships between longitudinal shrinkage and microfibril angle and negative relationships between longitudinal shrinkage and basic density.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第8期115-120,共6页
Scientia Silvae Sinicae
基金
国家自然科学基金(30671641)
关键词
欧美杨107杨
应拉木
微纤丝角
基本密度
轴向干缩率
Populus×euramericana ＇Neva＇
tension wood
microfibril angle
basic density
longitudinal shrinkage
