【摘要】 以管道理论为基础,运用主轴切割的方法,论述不同年龄小钻杨树体的结构特点。结果表明:树干生物量增加与高度的降低呈线性关系;同一层次内的叶量和枝量间存在显著的线性关系,其关系的确定性不受分层方式的影响;树冠不同层次内的累积叶量与支持的枝干总质量存在显著的线性关系;不同层次的总累积生物量与各层内的树干生物量密度之间的线性关系显著,对不同层次累积树干生物量与各层树干生物量密度进行指数回归,系数介于1.1~1.3,指数介于1~2,表明二者的关系是处于线性和指数关系之间的一种形式;在胸高以上,树干边材断面积与侧枝基部断面积总和呈线性关系,胸高之下线性关系不存在。建立不同年龄小钻杨边材与所支持叶量的树体管道模型,同时测得胸径(D1.3)与心材直径(Dx)间的关系为Dx=0.522 exp(0.169 8D1.3),r=0.984 8。更多还原

【Abstract】 Applying the pipe model theory,tree architecture characteristics of Populus xiaozhuanica is（described）.It is a linear relation between the increasing of trunk biomass and descending of height.It is also a linear relation between leaf biomass and branch biomass that can’t be affected by different way of dividing layers.And same relation exists（between） accumulated leaf biomass,branch and trunk biomass.The highest correlation coefficients were found between accumulated biomass and biomass per unit trunk.It is an exponent relation（between） accumulated trunk biomass and biomass per unit trunk,the value of exponent is from 1.1 to 1.3.（Relation） between sapwood area and total branch basal area is linear above breast-height.The pipe model for individual trees of Populus xiaozhuanica was made.Relation between diameter at breast height(D_1.3) and（diameter） of heartwood（D_x） is documented: D_x=0.522?exp(0.169?8D_1.3),r=0.984?8.更多还原