| 摘要: |
| 滨海核电站排放的低放射性污染物对海洋浮游生物及其生态系统的辐射影响日益受到人们关注。为探讨人工放射性核素对海洋浮游藻类的辐射效应机制，研究了放射性137Cs暴露下电离辐射对海洋浮游藻类三角褐指藻(Phaeodactylum tricornutum)的形态、生长速率以及叶绿素荧光特性的影响。结果表明，三角褐指藻在放射性为1 000 Bq/dm3比活度的137Cs处理组、CsCl对照组和空白组的比生长速率均值分别为0.600/d、0.600/d和0.610/d，组间差异不显著(p＞0.05)。在叶绿素荧光特征的影响方面，随培养时间的延长137Cs暴露下的三角褐指藻Fo、Fm呈上升趋势；Fv/Fm、Fv/Fo、NPQ呈先上升后趋于稳定的趋势，其稳定范围分别为0.5～0.6、1.0～1.4和0.7～1.1；Qp呈现先下降后稳定的趋势，其稳定范围为0.5～0.6。通过差异显著性比较分析处理组和对照组、空白组的比生长速率和叶绿素荧光特性参数无显著性差异。研究结果可为海洋放射性污染的预防和治理提供理论依据和实际参考。 |
| 关键词: 海洋生物学 人工放射性核素 137Cs 三角褐指藻 生长 叶绿素荧光特性 |
| DOI：10.3969/J.ISSN.2095-4972.2019.02.014 |
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| 基金项目:科技部海洋公益性行业科研专项资助项目(201505005); 国家海洋局第三海洋研究所基本业务费资助项目(海三科2017017); 国家海洋局专项业务资助项目(SOA201303) |
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| Effects of 137Cs on the growth and chlorophyll fluorescence of Phaeodactylum tricornutum |
| ZHAO Xin,JI Jian-da,WANG Lei,LU Zhi-qiang,YU Tao |
| (College of Fisheries, Jimei University, Xiamen 361021, China; Laboratory of Marine Isotopic Technology and Environmental Risk Assessment, Third Institute of Oceanography, MNR, Xiamen 361005, China) |
| Abstract: |
| Radiation effects of lowlevel radioactive pollutants from coastal nuclear power plants on phytoplankton and its ecosystems have attracted a growing and widely concern. In order to investigate the radiation effects of artificial radionuclides on marine planktonic algae, the morphology, growth rate and chlorophyll fluorescence characteristics of Phaeodactylum tricornutum were studied under exposure of 137Cs radiation. The results showed that the average growth rate of P. tricornutum in the 137Cs treatment group with radioactivity of 1 000 Bq/dm3, CsCl control group and blank group were 0.600/d, 0.600/d and 0.610/d, respectively. Compared with the stable isotope control group and blank group with CsCl added, the difference among the groups was not significant (p>005). The values of Fo and Fm increased with the culture time under 137Cs exposure. The ratios of Fv/Fm,Fv/Fo and NPQ tended to be stable after rising, and their stability ranges were 0.5～0.6, 1.0～1.4 and 0.7～1.1, respectively;Qp trended to decrease until it stabilized in range of 0.5～0.6. There was no significant difference in growth rate and chlorophyll fluorescence characteristics between the treatment group and the control group. The research results could provide a theoretical basis and practice references for the prevention and governance of marine radioactive pollution. |
| Key words: marine biology artificial radionuclide 137Cs Phaeodactylum tricornutum growth chlorophyll fluorescence characteristics |
