风和光照对侧柏、栓皮栎生长和形态建成的影响

Effects of Wind and Irradiation on Growth and Morphogenesis of Platycladus orientalis and Quercus variabilis

疏伐是一项重要的林业管理措施,其可以通过降低森林密度、减少树木对资源的竞争来提高树木的生长（Martín-Benito et al.,2010）。然而,在疏伐后的若干年内这种生长释放作用经常不能体现出来（Yang,1989;Youngblood,1991）,而且疏伐带来微环境的突然改变还可能引起存留树木的生长停滞、甚至顶端坏死（Bladon et al.,2006;2007）。

In this paper, two-years-old seedlings＇of Quercus variabilis and Platycladus orientalis were subjected to the following treatments ： full sunlight ＋ wind ; full sunlight without wind; shading ＋ wind ; shading without wind, to segregate irradiation from wind effect on growth and morphogenesis of the seedlings. After two-month treatment, wind blowing significantly inhibited height growth of the two species. However irradiation itself did not change their height growth. Diameter growth of P. orientalis was promoted by irradiation, but not related to wind blowing. Both irradiation and wind increased taper of P. orientalis stem, while they did not change taper of Q. variabilis stem. Irradiation with wind enhanced root growth of P. orientalis, but the two environmental factors did not change the root/shoot ratio. In general, wind, but not irradiation, inhibited height growth of the two species. The two species had differential responses of growth and morphogenesis to irradiation and wind. Wind blowing had relatively more significant inhibition to Q. variabilis growth, not only height growth but also assimilation, stomatal conductance, diameter and root growth. In contrast, wind did not significantly change the above processes of P. orientalis except for its height growth. Irradiation promoted diameter growth of P. orientalis, and along with wind increased root growth. However irradiation did not vary the processes variabilis. of Q