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本文以生长在 3种长江滩地类型 (江滩、洲滩、湖滩 )、3种栽植密度 ( 3m×4m ,4m× 5m ,5m× 6m)下的3个品系速生人工林杨树木材 [欧美杨无性系 72杨 (Populus×euramericacv.I -72 58) ,美洲黑杨无性系 63杨(P .deltiodescv.I-63 51 )和 69杨 (P .deltoidescv.I-69 55) ,以下简称 72杨 ,63杨 ,69杨 ]为对象 ,深入地分析了人工林杨树木材材性与生长培育之间的关系。结果表明 :( 1 )品系对滩地杨树木材材性有较大的影响。安徽新洲洲滩和湖北黄洲江滩上生长的 63杨 ,湖南沅江湖滩上生长的 72杨纤维长度最长 ,微纤丝角最小 ,导管比量最大 ,方差分析表明 :72、63、69杨微纤丝角和主要物理力学性质差异均达显著和极显著。 ( 2 )滩地类型对72、63、69杨木材材性都有或大或小的差异。方差分析表明 :63杨、69杨微纤丝角、基本密度、抗弯强度和干缩率差异显著 ,说明 63杨和 69杨受滩地类型影响较大。 ( 3)栽植密度对 72、63、69杨木材材性的影响因材性指标的不同而不同。对 72、63、69杨来讲 ,栽植密度越大 ,微纤丝角、导管比量增大 ,纤维长度、木纤维比量、木射线比量都减小 ,基本密度、抗弯弹性模量和抗弯强度也越小。方差分析表明 ,72杨和 69杨受栽植密度影响较大 ,63杨受栽植密度影响较小
In this paper, three species of fast-growing plantation poplar woods grown in three types of Yangtze River beach land (river beach, beach, beach), three planting density (3m × 4m, 4m × 5m, 5m × 6m) Populus × euramericacv.I -72 58, P. Deltiodescv.I-63 51 and P. Deltoidescv.I-69 55, hereinafter referred to as 72 Yang, 63 Yang, 69 Yang] as the object, this paper deeply analyzed the relationship between wood properties and growth and development of poplar in plantations. The results showed that: (1) The strains of poplar wood on the beach have a greater impact. 63 Yang grown on the banks of Xinzhouzhou Beach in Anhui Province and Huangzhou River in Hubei Province had the longest length, the smallest microfibril angle and the largest proportion of catheters on the Yuanjiang Lake beach in Hunan Province. The ANOVA showed that: 72, 63, 69 Young Microfibril angle and the main physical and mechanical properties of the differences were significant and extremely significant. (2) Types of beach land There are big or small differences in the wood properties of 72, 63 and 69 poplar. Variance analysis showed that there were significant differences in microfibril angle, basic density, flexural strength and dry shrinkage of 63 Yang and 69 Yang, which indicated that 63 Yang and 69 Yang were greatly affected by the type of beach land. (3) The effect of planting density on the wood properties of poplar 72, 63 and 69 varies with different material indexes. For 72, 63, and 69 Yang, the higher the planting density, the more the microfibril angle and the catheter ratio increased, the longer the fiber length, the smaller the wood fiber ratio, the smaller the wood-ray ratio. The basic density, flexural modulus And the bending strength is also smaller. Analysis of variance showed that 72 Yang and 69 Yang were more affected by planting density, and 63 Yang was less affected by planting density