Hokkaido University Forests, FSC, Sapporo, Japan.
Plant Cell Environ. 2010 Jul;33(7):1101-11. doi: 10.1111/j.1365-3040.2010.02132.x. Epub 2010 Mar 1.
To determine whether an elevated carbon dioxide concentration ([CO(2)]) can induce changes in the wood structure and stem radial growth in forest trees, we investigated the anatomical features of conduit cells and cambial activity in 4-year-old saplings of four deciduous broadleaved tree species - two ring-porous (Quercus mongolica and Kalopanax septemlobus) and two diffuse-porous species (Betula maximowicziana and Acer mono) - grown for three growing seasons in a free-air CO(2) enrichment system. Elevated [CO(2)] had no effects on vessels, growth and physiological traits of Q. mongolica, whereas tree height, photosynthesis and vessel area tended to increase in K. septemlobus. No effects of [CO(2)] on growth, physiological traits and vessels were seen in the two diffuse-porous woods. Elevated [CO(2)] increased larger vessels in all species, except B. maximowicziana and number of cambial cells in two ring-porous species. Our results showed that the vessel anatomy and radial stem growth of Q. mongolica, B. maximowicziana and A. mono were not affected by elevated [CO(2)], although vessel size frequency and cambial activity in Q. mongolica were altered. In contrast, changes in vessel anatomy and cambial activity were induced by elevated [CO(2)] in K. septemlobus. The different responses to elevated [CO(2)] suggest that the sensitivity of forest trees to CO(2) is species dependent.
为了确定二氧化碳浓度（[CO2]）升高是否会引起森林树木的木材结构和茎径向生长发生变化，我们研究了在自由空气 CO2 富集系统中生长了三个生长季节的 4 年生落叶阔叶树种 - 两种环孔材（蒙古栎和七叶树）和两种散孔材（白桦和槭树） - 的导管细胞的解剖特征和形成层活动。[CO2]升高对蒙古栎的导管、生长和生理特性没有影响，而七叶树的树高、光合作用和导管面积有增加的趋势。在两种散孔材中，[CO2]对生长、生理特性和导管没有影响。除了白桦和两种环孔材中的形成层细胞数量增加外，[CO2]升高增加了所有树种的大导管。我们的结果表明，尽管蒙古栎的导管解剖结构和形成层活动发生了变化，但蒙古栎、白桦和槭树的导管解剖结构和茎的径向生长不受[CO2]升高的影响。相比之下，[CO2]升高引起了七叶树的导管解剖结构和形成层活动的变化。对[CO2]升高的不同响应表明，森林树木对 CO2 的敏感性是物种依赖性的。
