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中国沙漠 ›› 2011, Vol. 31 ›› Issue (4): 889-893.

• 生物土壤与生态 • 上一篇    下一篇

紫外辐射增强对不同发育阶段荒漠藻结皮光合作用的影响

苏延桂1,2, 李新荣2, 赵 昕2, 王正宁2   

  1. 1.中国科学院新疆生态与地理研究所 干旱区生物地理与生物资源重点实验室, 新疆 乌鲁木齐 830011; 2.中国科学院寒区旱区环境与工程研究所 沙坡头沙漠试验研究站, 甘肃 兰州 730000
  • 收稿日期:2010-11-27 修回日期:2011-04-28 出版日期:2011-07-20 发布日期:2011-07-20

Effects of Enhanced UV-B on the Photosynthesis of Algal Crusts

SU Yan-gui1,2, LI Xin-rong2, ZHAO Xin2, WANG Zheng-ning2   

  1. 1.Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2.Shapotou Desert Research and Experiment Station, Cold and Arid Regions and Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2010-11-27 Revised:2011-04-28 Online:2011-07-20 Published:2011-07-20

摘要: 以腾格里沙漠东南缘自然植被区、51龄和26龄人工植被区藻结皮为研究对象,模拟研究了2%紫外辐射增强对不同发育阶段结皮叶绿素a含量(Chl-a)和净光合速率的影响。结果表明:①紫外辐射增强显著抑制了51龄和26龄人工植被区藻结皮的Chl-a含量(P<0.05),紫外辐射增强后不同发育阶段藻结皮的Chl-a含量无显著差异(P<0.05); ②紫外辐射增强显著抑制了3个植被区藻结皮的净光合速率(P<0.05),紫外辐射增强处理后,自然植被区,51龄和26龄人工植被区藻结皮的最大净光合速率分别为1.8、2.2 μmol·m-2·s-1和1.9 μmol·m-2·s-1,比对照分别下降了21%~49%,12%~22%和24%~59%。方差分析表明,紫外辐射增强后,3个发育阶段的藻结皮净光合速率无显著差异(P<0.05)。本研究表明,紫外辐射增强通过降低荒漠藻结皮的光合色素含量,减少了结皮的净光合速率,从而会对荒漠区藻结皮的生产力产生影响。

关键词: 荒漠藻结皮, 光合速率, 演替, 人工植被区, 自然植被区

Abstract: In this study, we investigated the effects of enhanced UV-B on the photosynthetic rate and Chl-a content of algal crusts of natural vegetation area, and that of having developed for 51 years and 26 years in artificial vegetation areas in the southeast of the Tengger Desert. The results indicated that: (1) the enhanced UV-B significantly inhibited the Chl-a content (P<0.05) of algal crusts in the 51 years and 26 years artificial vegetation areas (P<0.05), and the Chl-a content of algal crusts treated by enhanced UV-B had no significant difference among these three vegetation areas (P>0.05); (2) the photosynthesis of algal crusts at the three successional areas decreased profoundly after treatment by enhanced UV-B (P<0.05), and the photosynthetic rate of algal crusts in the natural vegetation area, 51 years and 26 years vegetation areas were 1.8 μmol·m-2·s-1, 2.2 μmol·m-2·s-1 and 1.9 μmol·m-2·s-1 respectively, which decreased by 21%~49%, 12%~22% and 24%~59% compared with the control area. After treatment by enhanced UV-B, the photosynthetic rates of algal crusts had no difference among the three successional areas (P<0.05). The results indicated that the enhanced UV-B significantly inhibited Chl-a contents and photosynthetic rate of algal crusts, and this will impose effects on ecosystem productivity of algal crusts.

Key words: desert algal crusts, photosynthetic rate, succession, artificial vegetation area, natural vegetation area

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