Phytoplankton photosynthesis-irradiance parameters during summer and winter in the northern South China Sea

Hao Qiang; Liu Chenggang; Le Fengfeng; Peng Xin; Zeng Xiangxi; Cai Yuming

doi:10.3969/j.issn.0253-4193.2016.04.002

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Hao Qiang, Liu Chenggang, Le Fengfeng, Peng Xin, Zeng Xiangxi, Cai Yuming. Phytoplankton photosynthesis-irradiance parameters during summer and winter in the northern South China Sea[J]. Haiyang Xuebao, 2016, 38(4): 22-30. doi: 10.3969/j.issn.0253-4193.2016.04.002

Citation:

Hao Qiang, Liu Chenggang, Le Fengfeng, Peng Xin, Zeng Xiangxi, Cai Yuming. Phytoplankton photosynthesis-irradiance parameters during summer and winter in the northern South China Sea[J]. Haiyang Xuebao, 2016, 38(4): 22-30. doi: 10.3969/j.issn.0253-4193.2016.04.002

Citation:

Hao Qiang, Liu Chenggang, Le Fengfeng, Peng Xin, Zeng Xiangxi, Cai Yuming. Phytoplankton photosynthesis-irradiance parameters during summer and winter in the northern South China Sea[J]. Haiyang Xuebao, 2016, 38(4): 22-30. doi: 10.3969/j.issn.0253-4193.2016.04.002

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Phytoplankton photosynthesis-irradiance parameters during summer and winter in the northern South China Sea

doi: 10.3969/j.issn.0253-4193.2016.04.002

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
3.
Zhejiang Marine Aquaculture Research institute, Wenzhou 325005, China
4.
State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China;Department of Fishery Science, Tianjin Agricultural University, Tianjin 300384, China

Received Date: 2015-09-16
Rev Recd Date: 2015-11-20

Abstract

Abstract

The phytoplankton photosynthesis rate is important to understand the variations of oceanic primary production (PP). In this study,we measured sea surface photosynthesis-irradiance (P-E) parameters from in situ experiments during summer and winter cruises,which was carried out in the northern South China Sea (nSCS) in 2004. The results showed that the P-E parameters had obvious seasonal variations in the nSCS. In winter,the P-E parameters were characterized by high α,high β,and high P_m^B. It indicated that phytoplankton could achieve relatively higher maximum photosynthesis rate,but the light-inhabitation would be significant when the light was supersaturate. In contrast to winter,the P-E parameters,α,β,and P_m^B, were relatively lower in summer,which indicated that phytoplankton favorites high photosynthetically active radiation environment,and its maximum photosynthesis rate was lower than that in winter but the light-inhabitation was very slight. We found some factors,such as temperature and size structure of phytoplankton,have significant correlation with P-E parameters. This implied that the photosynthesis rate was affected by both the seasonal changes of environment and the phytoplankton groups. The photosynthesis rate (P_model^B),calculated by P-E parameters,had significant linear correlation with the in situ photosynthesis rate (P_{in situ}^B) which was derived by PP experiments. However,the P_model^B results also showed overestimation,which was mainly due to the fact that the respiration rate could not be neglected in the P-E experiment. The results are helpful in the understanding of the characters of phytoplankton photosynthesis in the nSCS.
- photosynthesis,
- northern South China Sea,
- photosynthesis-irradiance curve,
- phytoplankton

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