欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

UV-B滤减处理下烟草光合作用参数对光照度的响应

纪鹏1;王毅2;陈宗瑜1;钟楚1;董陈文华1   

  1. 1云南农业大学农学与生物技术学院, 昆明 650201;2红塔集团技术中心, 云南玉溪 653100
  • 收稿日期:2008-10-28 修回日期:1900-01-01 出版日期:2009-07-10 发布日期:2009-07-10

Responses of tobacco leaf photosynthetic parameters to illuminance under attenuated UV-B radiation.

JI Peng1;WANG Yi2;CHEN Zong-yu1;ZHONG Chu1;DONG Chen-wen-hua1   

  1. 1College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China;2Technical Center of Hongta Group, Yuxi 653100, Yunnan, China
  • Received:2008-10-28 Revised:1900-01-01 Online:2009-07-10 Published:2009-07-10

摘要: 以烟草栽培品种K326为材料,通过覆盖不同的透明薄膜滤减UV-B辐射,研究了100%(CK)、75%(T1)、50% (T2)、35%(T3)UV-B辐射透过率处理下,烟草成熟初期光合参数与50和150 cm高度光照度的关系。结果表明:对于T1、T3,烟叶净光合速率的变化主要是气孔因素,而T2主要是非气孔因素;通过对4类处理的平均水分利用效率的比较,发现可能存在一个UV-B辐射对水分利用效率影响的阈值范围;150 cm高度光照度除了对蒸腾速率和T2处理的气孔导度起促进作用外,对其他光合参数都有一定的抑制作用;而不同处理的烟叶光合参数对50和150 cm高度上的光照度的响应都较为一致,在敏感程度上则存在差异。

关键词: 长江口, 浮游动物, 潮汐

Abstract: By the method of covering with different transparent plastic films to attenuate UV-B radiation, this paper studied the photosynthetic characteristics of tobacco cultivar K326 at its early maturity stage as affected by the illuminance at the heights 50 and 150 cm when the UV-B transmittance was 100% (CK), 75% (T1), 50% (T2), and 35% (T3). The change of tobacco leaf net photosynthetic rate in treatments T1 and T3 was mainly due to stomatal factor while in treatment T2 was mainly due to non-stomatal factors. Through the comparison of the average water use efficiency (WUE) in the four treatments, it was found that there could be a threshold of UV-B radiation intensity to WUE. The illuminance at height 150 cm had definite inhibitory effects on the photosynthetic parameters except the transpiration rate in all treatments and the stomatal conductance in treatment T2. For all treatments, the responses of tobacco leaf photosynthetic parameters to the illuminance at heights 50 cm and 150 cm were consistent but differed in sensitive degree.

Key words: Zooplankton, Changjiang Estuary, Tide