Nutrient limitation in the northern Canada Basin

Li Hongliang; Chen Jianfang; Gao Shengquan; Lu Yong; Jin Haiyan; Bai Youcheng; Zhuang Yanpei; Zhang Haisheng

doi:10.3969/j.issn.0253-4193.2015.11.014

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Article Navigation > Haiyang Xuebao > 2015 > 37(11): 147-154

Li Hongliang, Chen Jianfang, Gao Shengquan, Lu Yong, Jin Haiyan, Bai Youcheng, Zhuang Yanpei, Zhang Haisheng. Nutrient limitation in the northern Canada Basin[J]. Haiyang Xuebao, 2015, 37(11): 147-154. doi: 10.3969/j.issn.0253-4193.2015.11.014

Citation:

Li Hongliang, Chen Jianfang, Gao Shengquan, Lu Yong, Jin Haiyan, Bai Youcheng, Zhuang Yanpei, Zhang Haisheng. Nutrient limitation in the northern Canada Basin[J]. Haiyang Xuebao, 2015, 37(11): 147-154. doi: 10.3969/j.issn.0253-4193.2015.11.014

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Nutrient limitation in the northern Canada Basin

doi: 10.3969/j.issn.0253-4193.2015.11.014

1.
Key Laboratory of State Oceanic Administration for Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Key Laboratory of State Oceanic Administration for Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2015-04-20

Abstract

Abstract

The concentrations of nitrate, phosphate, silicate, Chl a were analyzed and in situ nutrients enrichment experiment was conducted in the summer of 2008 to discuss the impact of macronutrient limitation on phytoplankton biomass and community structure in the western Arctic Canada Basin. The results showed that there was a strong stratification in the upper 20 m at B80 station. Lower concentrations of dissolved inorganic nitrogen (DIN) and silicate (0.31 and 0.94 μmol/L, respectively) and serious deviation from the Redfield ratio of the N/P, N/Si (0.42 and 0.32, respectively) indicated N and Si limited in the upper layer of the Canada Basin. According to the trend of Chl a, nutrients uptake and phytoplankton community structure during the experiment deduced that nitrogen was the primary limited nutrient, while silicate inhibited the growth of siliceous phytoplankton in the upper layer of the Canada Basin. Meanwhile, the smaller half saturation constant (K_s) of nitrate can also prove that the phytoplankton growth rates were at a low level even the absence of nutrient limitation in the Arctic Basin. The phytoplankton species were dominated by nano-or pico-phytoplankton rather than diatom, which would be responsible for the higher nutrient assimilation ratios of N/P compared to the Redfield ratio.
- nutrient limitation,
- Redfield ratio,
- phytoplankton community structure,
- enrichment experiment,
- Arctic Ocean,
- Canada Basin

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References(33)

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