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首页> 外文学位 >The effect of mechanical perturbation on the conductivity, mechanical strength, and aboveground biomass of seven hybrid poplars (Populus trichocarpa, Populus deltoides).
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The effect of mechanical perturbation on the conductivity, mechanical strength, and aboveground biomass of seven hybrid poplars (Populus trichocarpa, Populus deltoides).

机译：机械扰动对七个杂种杨（Populus trichocarpa，Populus deltoides）的电导率，机械强度和地上生物量的影响。

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摘要

To mimic the wind-induced back and forth motion of plants under greenhouse conditions, mechanical perturbation, MP, (20 flexures per day) was applied to stems of sapling poplar clones for 70–90 days. This study quantifies the effect of MP on the wood properties of hydraulic conductivity and mechanical strength, and total aboveground biomass for seven hybrids of a cross between Populus trichocarpa (black cottonwood) and P. deltoides (eastern cottonwood). Mechanical perturbation of stems was expected to decrease hydraulic conductivity (kh) and aboveground biomass, and increase mechanical strength. Mechanical perturbation significantly decreased specific conductivity (ks or kh per conductive xylem cross sectional area) and aboveground biomass. Flexural rigidity (EI), wood density, and xylem transverse area at point of flexure increased while modulus of elasticity (MOE) and modulus of rupture (MOR) decreased in most of the mechanically perturbed stems. Surprisingly, kh max was positively correlated with EI (P 0.0001, R2 = 0.507) with some hybrids having both great mechanical strength and water conduction (e.g. Hybrid 19–61) while others were deficient in both properties. Similarly, both ks and MOE were positively correlated with percent vessel lumen area (P 0.0001 and P = 0.002, respectively).
机译：为了模拟风在温室条件下植物的来回运动，对幼树杨树无性系的茎施加机械扰动MP（每天20个挠曲），持续70-90天。这项研究量化了MP对 trichocarpa （黑杨木）和 P。deltoides < / italic>（东部杨木）。茎的机械扰动预计会降低水力传导率（k h ）和地上生物量，并增加机械强度。机械扰动显着降低了比电导率（每导电木质部横截面积的k s 或k h ）和地上生物量。在大多数受机械扰动的茎中，弯曲点的抗弯刚度（EI），木材密度和木质部横截面积增加，而弹性模量（MOE）和断裂模量（MOR）降低。出乎意料的是，k h max 与EI呈正相关（ P <0.0001，R 2 = 0.507），并且一些杂种具有很高的机械强度和水分传导（例如Hybrid 19-61），而其他一些则缺乏这两种特性。同样，k s 和MOE均与血管腔面积百分比呈正相关（ P <0.0001和 P = 0.002）。

著录项

  • 作者

    Kern, Kristine A.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Biology Plant Physiology.; Biology Botany.; Agriculture Wood Technology.
  • 学位 M.S.
  • 年度 2003
  • 页码 53 p.
  • 总页数 53
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;植物学;森林采运与利用;
  • 关键词

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