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| 2016年春季西太平洋M2海山浮游植物粒级结构与初级生产力研究 |
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代晟1,2, 孙晓霞1,2,3, 梁俊华1, 田梓杨1,2, 刘涛1,2
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1.中国科学院海洋研究所 山东胶州湾海洋生态系统国家野外科学观测研究站 青岛 266071;2.中国科学院大学 北京 100049;3.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 青岛 266071
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| 摘要: |
| 2016年3月对西太平洋马里亚纳区域M2海山浮游植物粒级结构和分粒级初级生产力进行了观测，同时结合温度、盐度和营养盐浓度，研究了M2海山的总叶绿素a浓度的分布规律，不同粒级浮游植物对总叶绿素a的贡献率及其与环境因子的关系，初级生产力结构和分布特征。结果表明：M2海山各水层叶绿素a浓度变化范围分别为0.004—0.304mg/m3，平均叶绿素a浓度为0.094mg/m3。微微型浮游植物在整个调查区域内为最优势类群，对总叶绿素a浓度的贡献率达到了85%，微型浮游植物和小型浮游植物的贡献率均较低，分别为10%和5%。M2海山的叶绿素a浓度最大层均在100m深度附近的次表层，其中西南部和东南部为叶绿素a浓度高值区。M2海山的平均初级生产力为71.31mgC/（m2·d），初级生产力的主要贡献者为微型和微微型浮游植物，其中微型浮游植物贡献率达到了72%，微微型浮游植物贡献率为28%。M2海山的海山效应不明显，浅海山（<200m）可能对浮游植物的生长存在促进作用。 |
| 关键词: 热带西太平洋 海山 浮游植物叶绿素a 粒级结构 初级生产力 |
| DOI：10.11693/hyhz20170900237 |
| 分类号:P717 |
| 基金项目:中国科学院战略性先导科技专项（A类），XDA11030204号；“973”课题“陆坡浮游生物群落分布及功能”，2014CB441504号；中国科学院创新交叉团队“海洋中尺度动力过程及其生态效应”项目资助。 |
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| BIOAMASS OF SIZE-FRACTIONATED PHYTOPLANKTON AND PRIMARY PRODUCIVITY AT M2 SEAMOUNT IN TROPICAL WEST PACIFIC IN SPRING 2016 |
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DAI Sheng1,2, SUN Xiao-Xia1,2,3, LIANG Jun-Hua1, TIAN Zi-Yang1,2, LIU Tao1,2
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1.Jiaozhou Bay Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
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| Abstract: |
| The distribution and concentration of size-fractionated chlorophyll a (chl a) and size-fractionated primary productivity at Seamount M2 in the western Pacific were investigated in spring 2016. The results show that the average chl a concentration was 0.094mg/m3, of which pico-phytoplankton chl a was dominant for occupying >85%. The deep chlorophyll maximum layer (DCML) was observed at 100m in depth. The primary productivity was about 71.31mgC/(m2·d), and composed of mainly nano- and pico-phytoplankton productivity. The nano-phytoplankton productivity contributed 72% to the primary productivity, although the biomass of nano-phytoplankton was only about 10% of the total. The pico-phytoplankton productivity contributed 28% to the primary productivity. Therefore, no obvious “Seamount Effect” was found in Seamount M2, and a shallow seamount (<200m) may promote the growth of phytoplankton. |
| Key words: the Western Pacific Seamount phytoplankton chl a size classes primary productivity |