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AOS 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

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周婧 发表于 2018-1-22 10:59:55 | 显示全部楼层 |阅读模式
本帖最后由 诺瓦尔ior 于 2018-1-22 11:27 编辑

           Size structure of biomass and primary production of phytoplankton: environmental impact analysis in the Dongsha natural gas hydrate zone, northern South China Sea

Author
HUANG Xin     GuangdongProvince Key Laboratory of Coastal Ocean Variation and Disaster Prediction,Guangdong Ocean University, Zhanjiang, China
CHEN Shuai    KeyLaboratory of Marine Geology and Environment, Institute of Oceanology, ChineseAcademy of Sciences, Qingdao, China; Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
WANG Xiaoyuan    Key Laboratory of Marine Geology and Environment, Institute ofOceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for MarineMineral Resources, Qingdao National Laboratory for Marine Science and Technology,Qingdao, China
ZHANG Shuwen      Guangdong Province Key Laboratory of Coastal Ocean Variation andDisaster Prediction, Guangdong Ocean University, Zhanjiang, China
CHEN Fajin     GuangdongProvince Key Laboratory of Coastal Ocean Variation and Disaster Prediction,Guangdong Ocean University, Zhanjiang, China
PU Xiaoqiang          Guangdong Province Key Laboratory of Coastal Ocean Variationand Disaster Prediction, Guangdong Ocean University, Zhanjiang, China

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.

Key words: phytoplankton  biomass  primary production  size fractionation  gas hydrate  northern South China Sea



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

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