林下耕作对滩地杨树木材物理力学性质的影响研究  

Research on the Effects of Tillage on the Physico-mechanical Properties of Poplar Wood on Yangtze River Marshlands

作　　者：徐斌[1] 黄庆丰[1] 朱涛[1] 袁雷[1] 

机构地区：[1]安徽农业大学林学与园林学院,合肥230036

出　　处：《安徽林业科技》2012年第2期67-72,共6页Anhui Forestry Science and Technology

基　　金："十一五"科技支撑项目(2006BAD03A1505)

摘　　要：本文对长江滩地这一特定立地条件下经过人为耕作与非耕作模式下的杨树木材物理力学性质及应力木分布情况与力学性质间的关系进行了比较研究。结果表明:林下耕作可提高杨树木材密度,与对照木相比,基本密度和气干密度差异性分别达显著与极显著水平;能够减少应拉木的产生,与对照木相比差异百分率达24.82%,进而使木材的差异干缩减小,木材尺寸稳定性提高;各项力学指标均优于对照杨树,且与应力木的量呈线性负相关,其中抗弯强度与抗弯弹性模量与其相关性显著。In this paper a comparative study was made on the poplar wood physieo-mechanical properties and the relationship between the stress distribution in wood and mechanical properties under Yangtze River marshland site conditions in tillage and no-tillage modes. The results showed that the forestland tillage could improve the poplar wood density. The differentiations of the poplar wood basic density and air-dry density with tillage were significant and extremely significant respectively compared with those without tillage, which could reduce the tension-wood formation by 24.82% compared with the control wood, reduce the wood dry shrinkage ratio and improve the wood dimensional stability. All the wood mechanical indicators of poplar with tillage were better than those of poplar without tillage, and showed negative linear eorrelation with the amount of stress-wood and significant positive correlation with the bending strength and bending elasticity modulus.

关 键 词：林下耕作 滩地 物理力学性质 应力木 

分 类 号：S792.11[农业科学—林木遗传育种]