| 春季西沙永乐龙洞浮游植物的昼夜垂直分布特征 |
| |
| 引用本文： | 葛汝平,傅亮,毕乃双,陈畅,刘光兴,庄昀筠,杨作升,范德江,姚鹏,陈洪举.春季西沙永乐龙洞浮游植物的昼夜垂直分布特征[J].中国海洋大学学报(自然科学版),2020(1):65-73. |
| |
| 作者姓名： | 葛汝平 傅亮 毕乃双 陈畅 刘光兴 庄昀筠 杨作升 范德江 姚鹏 陈洪举 |
| |
| 作者单位： | 中国海洋大学环境科学与工程学院;青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室;中国海洋大学海洋环境与生态教育部重点实验室;三沙航迹珊瑚礁保护研究所;中国海洋大学海底科学与探测技术教育部重点实验室;中国海洋大学海洋化学理论与工程技术教育部重点实验室 |
| |
| 基金项目： | 国家重点研发计划项目(2016YFA0601202);中央高校基本科研业务费项目(201762038)资助~~ |
| |
| 摘 要： | 南海永乐龙洞位于西沙群岛永乐环礁,是迄今为止发现的最深的海洋蓝洞,水文环境及理化因素特殊,90 m以下水体为无氧环境。为研究永乐龙洞浮游植物的群落组成及其昼夜变化,于2017年3月在龙洞、潟湖及外礁坡进行浮游植物样品采集。研究结果表明:龙洞内叶绿素a浓度呈现随深度先增大后减小的趋势,日间浓度最大值层出现在40 m层(0.42μg/L),夜间则出现在20 m层(0.59μg/L)。永乐龙洞微微型浮游植物丰度介于1.1×10^3~5.1×10^4 cells/mL。聚球藻在上层水体占优势(0~20 m),40 m以下水层原绿球藻丰度对微微型浮游植物丰度贡献率最大(90%以上),微微型真核浮游植物丰度在整个水体都较低(除20 m层)。微微型浮游植物昼夜存在明显差异,夜间其丰度最大值层为20 m层,日间则上移至表层。本研究共记录微型和小型浮游植物5门41属55种(含未定种)。其中,硅藻门25属34种、甲藻门12属15种、金藻门1属1种、蓝藻3属、隐藻1属。微型和小型浮游植物丰度介于3.3×10^2~9.8×10^4 cells/L。甲藻丰度对浮游植物总丰度贡献率最大,其次是硅藻,隐藻和蓝藻丰度仅在少数水层占优势。微型和小型浮游植物昼夜变化明显,夜间丰度最大值层为20 m层,日间则出现在40 m层。微微型、微型和小型浮游植物垂直分布与叶绿素a浓度垂直分布一致性高。龙洞浮游植物的种类数和丰度高于潟湖和外礁坡。
|
| 关 键 词： | 永乐龙洞 南海 叶绿素A 微微型浮游植物 微型和小型浮游植物 垂直分布 昼夜变化 |
Diel Vertical Distribution of Phytoplanktonin Yongle Blue Hole,Xisha Islands in Spring |
| |
| GE Ru-Ping,FU Liang,BI Nai-Shuang,CHEN Chang,LIU Guang-Xing,ZHUANG Yun-Yun,YANG Zuo-Sheng,FAN De-Jiang,YAO Peng,CHEN Hong-Ju.Diel Vertical Distribution of Phytoplanktonin Yongle Blue Hole,Xisha Islands in Spring[J].Periodical of Ocean University of China,2020(1):65-73. |
| |
| Authors: | GE Ru-Ping FU Liang BI Nai-Shuang CHEN Chang LIU Guang-Xing ZHUANG Yun-Yun YANG Zuo-Sheng FAN De-Jiang YAO Peng CHEN Hong-Ju |
| |
| Institution: | (College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;Laboratory of Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266200,China;Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Sansha Trackline Institute of Coral Reef Environment Protection,Sansha 573199,China;Key Laboratory of Submarine Geosciences and Prospecting Technique,Ministry of Education,Ocean University of China,Qingdao 266100,China;Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China) |
| |
| Abstract: | Yongle Blue Hole is located in the Yongle coral atoll in the South China Sea, and is the deepest blue hole in the world. The special geological and physiochemical characteristics shaped the unique ecosystem of Yongle Blue Hole, particularly with the anoxic waters below 90 m. To investigate the phytoplankton community composition and diel vertical distribution, water samples from multiple depths were collected at Yongle Blue Hole, lagoon and outer reef slopes respectively in March, 2017. The results showed that the vertical distribution of phytoplankton in the blue hole showed an obvious diel patter with the maximum chlorophyll a concentration found at 40 m in the daytime(0.42 μg/L) and at 20 m layer in the nighttime(0.59 μg/L). The abundance of picophytoplankton at each sampling depth ranged from 1.1×10^3 cells/mL to 5.1×10^4 cells/mL, which peaked at 0 m in the daytime while at 20 m in the nighttime. Among picophytoplankton, Synechococcus and Prochlorococcus dominated the upper layer(< 20 m) and layers below 40 m, respectively, while picoeukaryotes were low abundance in the total water column. The diurnal vertical migration of picophytoplankton was obvious, the abundance peaked at 0 m and 20 m at day and night, respectively. For nano-and microphytoplankton, a total of 55 taxa(including uncertain species) from 5 phyla were identified, including Bacillariophyta(25 genera and 34 species), Dinophyta(12 genera and 15 species), Cryptophyta(1 genera and 1 species), Chrysophyta(3 genera) and Cyanophyta(1 genera). The abundance of nano-and microphytoplankton at each sampling depth ranged from 3.3×10^2 cells/L to 9.8×10^4 cells/L. The dominant groups were dinoflagellate and diatom, whereas chrysophyta and cyanophyta were dominant in few layers. The diel vertical migration of nanophytoplankton and microphytoplankton was apparent, the abundance which peaked at 40 m in the daytime and at 20 m in the nighttime. The vertical distribution of picophytoplankton, nanophytoplankton and microphytoplankton was in concert with that of size-fractioned chlorophyll a concentration. The number of species and abundance of phytoplankton in Blue hole were significantly higher than those in the lagoon and outer reef slopes. |
| |
| Keywords: | Yongle Blue Hole South China Sea chlorophyll a picophytoplankton nanophytoplankton and microphytoplankton vertical distribution diurnal variation |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
