Phytoplankton responses to nitrogen and phosphorus enrichment in relation to different water masses

Li Jiajun; Shen Pingping; Tan Yehui; Jiang Xin; Zhou Linbin

doi:10.3969/j.issn.0253-4193.2015.10.009

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Li Jiajun, Shen Pingping, Tan Yehui, Jiang Xin, Zhou Linbin. Phytoplankton responses to nitrogen and phosphorus enrichment in relation to different water masses[J]. Haiyang Xuebao, 2015, 37(10): 88-99. doi: 10.3969/j.issn.0253-4193.2015.10.009

Citation:

Li Jiajun, Shen Pingping, Tan Yehui, Jiang Xin, Zhou Linbin. Phytoplankton responses to nitrogen and phosphorus enrichment in relation to different water masses[J]. Haiyang Xuebao, 2015, 37(10): 88-99. doi: 10.3969/j.issn.0253-4193.2015.10.009

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Phytoplankton responses to nitrogen and phosphorus enrichment in relation to different water masses

doi: 10.3969/j.issn.0253-4193.2015.10.009

1.
Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;University of Chinese Academy of Sciences, Beijing 100049, China;Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2015-01-21

Abstract

Abstract

In situ survey of northeastern South China Sea (20°~24°N,114°~121°E),combined with nutrient (Nitrogen and Phosphorus) enrichment experiments were conducted during a cruise of Shiyan Ⅲ in May 2014. Based on the analysis of environmental variables and water masses,the northeastern South China Sea were divided into three areas: near shore regions,continental shelf regions and deep sea basins. The incubation results showed that phytoplankton did not response significantly to enrichment during incubation in near shore and sea basin stations,whereas increased after 48 h in the area of continental shelf,especially in the group which added both nitrite and phosphate. Trichodesmium were abundant in all experiment stations,while died away quickly during incubation. The phytoplankton species composition and proportion of size fractioned Chl a also changed notably with nutrient enrichment,and the variation was more significant in shelf regions. The results of shelf regions showed that the dominant species shifted from dinoflagellates such as Amphidinium carterae,Dinophysis argus,Prorocentrum sp. to diatoms such as Chaetoceros cinctus,C. curvisetus,C. radicans and Leptocylindrus danicus after incubation. Besides,the results also revealed that phosphate stimulated the growth of picophytoplankton synechococcus in the area of continental shelf significantly.
- northeastern South China Sea,
- phytoplankton,
- nutrient enrichment,
- water masses

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