| KANG Jianhua,LIANG Qianyong,WANG Jianjun,LIN Yili,HE Xuebao,XIA Zhen,ZHENG Xinqing,WANG Yu. 2018. Size structure of biomass and primary production of phytoplankton: environmental impact analysis in the Dongsha natural gas hydrate zone, northern South China Sea. Acta Oceanologica Sinica, 37(1):97－107 |
| Size structure of biomass and primary production of phytoplankton: environmental impact analysis in the Dongsha natural gas hydrate zone, northern South China Sea |
| 南海北部东沙天然气水合物区浮游植物生物量和生产力粒级结构特征及其环境影响分析 |
| Received:April 06, 2017 |
| DOI：10.1007/s13131-017-1123-y |
| Key words:phytoplankton biomass primary production size fractionation gas hydrate northern South China Sea |
| 中文关键词: 浮游植物 生物量 初级生产力 粒级结构 天然气水合物区 南海北部 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | KANG Jianhua | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | LIANG Qianyong | Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China | tomlqy@163.com | | WANG Jianjun | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | LIN Yili | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | HE Xuebao | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | XIA Zhen | Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China | | | ZHENG Xinqing | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | WANG Yu | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | |
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| Abstract: |
| The size-fractionated biomass and primary production of phytoplankton, and the influence of environmental factors on it were studied in the Dongsha natural gas hydrate zone of the northern South China Sea in May 2013. Low nutrient, low chlorophyll a (Chl a) and primary productivity characteristics were found in these waters. The phenomena of subsurface Chl a maximum layers (SCMLs) and primary production maximum layers (SPMLs) were observed in the Dongsha waters. There were significant differences in the size-fractionated biomass and primary production that showed picophytoplankton > nanophytoplankton > microphytoplankton in terms of biomass and degree of contribution to production. Vertical biomass distribution indicated there were considerable differences among different phytoplankton within the euphotic zone (Zeu) in spring. For example, microphytoplankton was distributed evenly in the euphotic layer and nanophytoplankton was mainly distributed in the subsurface or in the middle of the euphotic layer, while picophytoplankton was mainly distributed in the middle or bottom of the euphotic layer. Smaller cell size and larger relative surface area allow picophytoplankton to benefit from nutrient competition and to hold a dominant position in the tropical oligotrophic waters of low latitudes. There was a positive correlation between size-fractionated biomass and temperature with pH and a negative correlation between size-fractionated biomass and silicate with phosphate. There was a positive correlation between size-fractionated primary production and temperature and a negative correlation between size-fractionated biomass and salinity with phosphate. Phosphate was an important factor influencing the size structure of phytoplankton. Meanwhile, irradiation and the euphotic layer were more important in regulating the vertical distribution of size-fractionated phytoplankton in the Dongsha natural gas hydrate zone. |
| 中文摘要: |
| 本文讨论了2013年5月南海东沙天然气水合物区浮游植物生物量和生产力粒级结构特征及其环境影响因素。结果表明，研究海域表现出典型的低营养盐、低叶绿素a、低生产力特征，浮游植物叶绿素a和初级生产力具有明显的次表层最大值现象。东沙海域生物量和初级生产力粒级结构差异性显著，从生物量和生产力贡献度来看，表现为微微型浮游植物> 微型浮游植物> 小型浮游植物。生物量的垂直分布结果表明，春季不同粒级类群浮游植物在真光层内的分布存在明显不同，比如小型浮游植物在真光层内分布较均匀；微型浮游植物则主要分布于近表层或真光层中部，而微微型浮游植物则主要分布于真光层中部和底部。微微型浮游植物在纬度较低的热带贫营养海区之所以能够占主导优势，最主要的原因是其极小的细胞体积和较大的表面积使其有利于营养竞争。相关性分析表明，南海东沙浮游植物各粒级生物量与温度、pH显著正相关，与硅酸盐、磷酸盐显著负相关；浮游植物各粒级生产力与温度显著正相关，与盐度、磷酸盐显著负相关。磷酸盐含量是影响东沙海域浮游植物粒级结构差异的重要因素之一，同时，光辐照度和水体的真光层深度对东沙天然气水合物区不同粒径浮游植物的垂直分布起着更为重要的调控作用。 |
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