| 阳光紫外辐射对绿藻石莼光化学效率的影响 |
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| 引用本文： | 徐军田,高坤山.阳光紫外辐射对绿藻石莼光化学效率的影响[J].海洋学报,2007,29(1):127-132. |
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| 作者姓名： | 徐军田 高坤山 |
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| 作者单位： | 1.汕头大学, 海洋生物研究所, 广东, 汕头, 515063 |
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| 摘 要： | 探讨太阳紫外辐射(UVR)对大型海藻的影响,选择常见的海藻石莼(Ulva lactuca)为实验材料,研究了其光化学效率与UVR的关系.实验结果表明,石莼光化学效率在较强太阳辐射下急剧下降,在下午光强变弱时开始恢复,显示了一个明显的日变化模式:早上和下午保持较高的水平,中午降为最低.其光化学效率的日变动,与可见光和UVR均有关系,在中午高太阳辐射下,UV-B对藻体光化学效率的影响较大.长期实验结果显示,UVR对石莼光化学效率的影响,在实验的第二天表现为最大,随之逐渐减弱.本实验的研究结果可为研究阳光紫外线对大型海藻生长和生理的影响提供一定参考.
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| 关 键 词： | 石莼 紫外线 光化学效率 |
| 文章编号： | 0253-4193（2007）01-0127-06 |
| 收稿时间： | 2005/4/29 0:00:00 |
| 修稿时间： | 2005-04-292006-09-14 |
Effects of solar UVR on the effective quantum yield of Ulva lactuca |
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| XU Jun-tian and GAO Kun-shan.Effects of solar UVR on the effective quantum yield of Ulva lactuca[J].Acta Oceanologica Sinica (in Chinese),2007,29(1):127-132. |
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| Authors: | XU Jun-tian and GAO Kun-shan |
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| Institution: | 1.Marine Biology Institute, Shantou University, Shantou 515063, China2.Marine Biology Institute, Shantou University, Shantou 515063, China;Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China |
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| Abstract: | The marine green macroalga Ulva lactuca was selected to study the effects of solar UVR(280~400 nm) on its photochemical efficiency.Results showed that the photochemical efficiency decreased when the thalli were exposed to high solar radiation in the late morning and recovered when it decreased in the late afternoon.The photochemical efficiency showed a typical pattern that it was the lowest during noon period with the higher values in the early morning and later afternoon.This noontime inhibition was caused not only by the photosynthetic active radiation(PAR,400~700 nm) but also UV radiation.UVB significantly affected the photochemical efficiency.Long-term experiments showed that the photochemical efficiency was most inhibited on the second day,however,it became less and less suppressed by UVR while the thalli became acclimated. |
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| Keywords: | Ulva lactuca UV radiation photochemical efficiency |
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