| 摘要: |
| 利用Phyto-PAM测量大亚湾浮游植物的光合作用能力、非化学淬灭并建立快速光曲线, 同时研究浮游植物群落结构、组成、丰度和相应的环境因素, 分析光合作用特征与浮游植物生长和分布的耦合关系。本次调查期间大亚湾浮游植物以集群化硅藻为优势物种, 各站位最大光量子收益达到0.72。大亚湾浮游植物适应高光强, 当光照达到1000μE/(m2·s)时电子传递速率逐渐达到饱和; 光照达到1500μE/(m2·s)浮游植物依然可进行光合作用, 叶黄素循环保护光合器官使其免受高光强损伤; 当光照达到1700μE/(m2·s)时, 光合器官可能受到损伤, 此时电子传递速率下降, 实际光量子收益接近于0。集群化硅藻能够耐受较广的光照范围及其活跃的光合特征有利于它们在全球海区的广泛分布。 |
| 关键词: 浮游植物, 光合作用, 光量子收益, 快速光曲线 |
| DOI：10.11693/hyhz201203028028 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973)项目, 2011CB403603 号; 国家自然科学基金项目, 41106117 号 |
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| PHOTOSYNTHETIC CHARACTERISTICS OF PHYTOPLANKTON IN THE DAYA BAY |
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WANG Xiao-Dong1, JIANG Tao1, CEN Jing-Yi1, OU Lin-Jian1, WANG Xiao2, HUANG Bang-Qin3, Lü Song-Hui1
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1.Research Center for Harmful Algae and Aquatic Environment;2.The First Institute of Oceanography, State Oceanic Administration;3.College of Environment & Ecology, Xiamen University
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| Abstract: |
| Photosynthetic capacity, rapid light curves and NPQ of phytoplankton in the Daya Bay were measured using pulse-amplitude-modulation (PAM) fluorometry. Phytoplankton dynamics and environmental parameters were also investigated with the purpose of assessing the coupling between photosynthetic capacity and phytoplankton distribution. During the investigation periods, multi-cellular diatoms were dominant, and their maximum quantum yields were up to 0.72. Our results revealed that acclimation of phytoplankton in the Daya Bay to high irradiance allowed saturated electron transport to occur at PAR of 1000μmol/(m2·s). The development of non-photochemical quenching and xanthophylls cycle activity could protect the photosynthesis apparatus once PAR was elevated to 1500μmol/(m2·s). The PAR of 1700μmol/(m2·s) trig-gered biophysical alterations in photosynthesis apparatus, resulting in the declined effective quantum yield and electron transport rate. The accumulation to extensive temperature range and high photosynthetic activity are in favor of the worldwide distribution of multi-cellular diatoms in the natural environments. |
| Key words: Phytoplankton, Photosynthesis, Quantum yield, Rapd light curves |
