| 摘要: |
| 目前关于中国近海浮游植物光合作用特征的研究较少, 尤其是海洋浮游藻类冬季光合生理生态方面的研究少见报道。本实验利用浮游植物荧光仪Phyto-PAM 测量了胶州湾浮游植物最大光化学量子产量、快速光曲线、光化学淬灭以及非光化学淬灭, 通过显微镜镜检获得浮游植物群落结构组成与丰度结果, 结合相应的环境因子, 对胶州湾冬季浮游植物进行了原位光合作用特征研究。结果表明: 调查期间胶州湾浮游植物具有较高的光合活性与潜力, 最大光化学量子产量保持在0.69 左右,光能利用效率大部分处于0.2—0.3 之间, 快速光曲线十分典型, 当光强超过1000 μmol/(s*m2)后依然能保持较好的光合活性, 光化学淬灭值较高; 当光强超过1500 μmol/(s*m2)后, 相对电子传递速率开始下降, 实际光量子收益达到最低, 非光化学淬灭升高, 此时海洋浮游植物将光合机构吸收的过量光能以热能的形式耗散掉, 有效地保护了胶州湾浮游植物的光合器官不因高光强的照射而受到损伤。冬季大部分时期胶州湾浮游植物丰度极低, 但是湾内浮游植物具有较强的光合活性, 加上相对稳定的水文、生物等环境以及较丰富的营养盐和相对有利的营养盐结构, 是推动冬季浮游植物高峰期出现的关键生理生态因素。 |
| 关键词: 胶州湾 浮游植物 群落结构 光合活性 营养盐 |
| DOI：10.11693/hyhz20130400013 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973)项目, 2011CB403603 号; 中国科学院战略性先导科技专项, XDA05030401 号; 国家海洋公益性行业科研专项, 201005014 号 |
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| PHOTOSYNTHETIC CHARACTERISTICS OF PHYTOPLANKTON IN WINTER IN THE JIAOZHOU BAY |
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li jun lei and sun xiao xia
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University of Chinese Academy of Sciences,Jiaozhou Bay Marine Ecosystem Research Station，Institude of Oceanology，Chinese Academy of Sciences
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| Abstract: |
| The photosynthetic characteristics of phytoplankton in Chinese offshore was less known because the studies were few. In this paper, Phyto-PAM (Pulse Amplitude Modulation) was applied to measure Fv/Fm (maximum quantum yield of PSII), RLCs (rapid light curves), qP, and NPQ (photochemical and non-photochemical quenching of phytoplankton). Phytoplankton community structure, distribution, and abundance, and the environmental parameters were also investigated to study the in situ photochemical vitality of phytoplankton in December (wintertime) in the Jiaozhou Bay. Results show that the photochemical vitality and potential of phytoplankton were active during this period; Fv/Fm maintained at about 0.69; most of the light utilization efficiencies (α) were between 0.2 to 0.3. Typical RLCs suggest that saturated electron transport appeared at PAR of 1000 μmol/(s*m2), when PAR rose to 1500 μmol/(s*m2), rETR (relative electron transport rate) began to decline, ΦpsII (the actual photochemical efficiency of PS II) reduced to the minimum and NPQ increased. Excess light energy was dissipated in heat, protecting marine phytoplankton photosynthesis apparatus from the damage of high intensity irradiation. Though phytoplankton abundance was extremely low in December. Strong photochemical activity combined with relatively stable hydrological, biological environment, and rich nutrients would lead to the peak of phytoplankton abundance in February in the Jiaozhou Bay. |
| Key words: Jiaozhou Bay phytoplankton community structure photosynthetic characteristics nutrient |
