厦门筼筜湖潟湖底栖微藻光合色素的时空变化特征及与环境因子的关系  

Temporal and spatial variation of microphytobenthic photosynthetic pigments and its relationship with environmental factors in Yundanghu Lagoon,Xiamen

作　　者：李欣[1] 徐松立[1] 肖武鹏[1] 谢聿原[1] 黄邦钦[1] 

机构地区：[1]福建省海陆界面生态环境重点实验室、厦门大学环境与生态学院,福建厦门361005

出　　处：《应用海洋学学报》2013年第1期79-87,共9页Journal of Applied Oceanography

基　　金：国家973计划资助项目(2011CB403603);国家海洋局公益性行业科研专项经费资助项目(201005015-3)

摘　　要：2010年7月至2011年7月,利用高效液相色谱分离分析技术研究了厦门筼筜湖潟湖表层沉积物的底栖微藻生物量(以叶绿素a计)和光合色素组成,探讨了其与环境因子的关系.结果表明,表层沉积物中检出岩藻黄素、别藻黄素、玉米黄素、叶绿素b四种光合色素,对应的微藻类群包括硅藻、隐藻、蓝藻和绿藻.底层(表层沉积物)与水层(水体)微藻叶绿素a生物量呈显著负相关关系(p<0.05),但底层-水层对应的光合色素不存在显著相关关系,此暗示底层光合色素主要是底栖微藻的贡献,而非来自水层浮游微藻的沉降.底栖微藻生物量随时间变化明显,夏季(6～8月)较低(1.30 mg/m2),冬季(12月至翌年2月)较高(86.16 mg/m2).各测站底栖微藻生物量存在空间差异,随湖区的水深增加而降低,与沉积物表层光辐照度呈显著的正相关关系(p<0.05).岩藻黄素与降雨量呈显著负相关,别藻黄素与水体无机氮含量呈显著正相关,玉米黄素分布主要受温度影响,除玉米黄素外,其他光合色素含量与光辐照度呈正相关.初步估算表明,底栖微藻占该浅水潟湖生态系统水层-底层微藻叶绿素a生物量和固碳量的27.64%和12.56%.From July 2010 to July 2011, high performance liquid chromatography （HPLC） was used to study sur- face microphytobenthic Chl-a biomass and photosynthetic pigments at 3 stations in Yundanghu Lagoon, Xiamen. The correlation between environmental factors and microphytobenthic pigments was analyzed. The results showed that fucoxanthin; alloxanthin; zeaxanthin and Chl b were detected in surface sediments, which represented the ben- thic algal community of including diatoms,eryptophyta, cyanophyta and ehlorophyta. There was significantly nega- tive correlation of microalgal biomass between benthic layer （ surface sediment） and pelagic layer （ water column） （p 〈 0.05） , However, it was not significant for correlation of the corresponding photopigments between the ben- thic-pelagic layer. This implied the sediment photosynthetic pigments were mainly from the contribution of benthic microalgae, rather than the sinking pelagic phytoplankton. Temporally, microphytobethic biomass was lower in smnmer （June to August, 1.30 mg/m2） and higher in winter （December to February, 86.16 mg/m2）. For the spatial scale, mierophytobethie biomass was higher in shallow water than that in deep water in Yundanghu Lagoon, and had a well positive correlation with light intensity （Iz ） at the sediment surface （p 〈0. 05 ）. Fucoxanthin had a significant positive correlation with local rainfall, while alloxanthin was significant positive correlation with dissolved inorganic nitrogen （DIN） , zeaxanthin was well influenced by temperature. Most of the photopigments had a well positive correlation with light internsity （Iz） except for zeaxanthin. Model-based data showed that benthic mieroal- gae contributed 27.64% and 12.56% of Chl-a and carbon fixation, respectively, in the pelagic-benthic system in Yuandanghu Lagoon, Xiamen.

关 键 词：海洋生物学 底栖微藻 光合色素 簧彗湖 亚热带泻湖 环境因子 

分 类 号：P735[天文地球—海洋生物学]