Estimation of primary production from the light absorption of phytoplankton and photosynthetically active radiation in the South China Sea

Zhao, Hongwuyi1,2; Cao, Wenxi1; Deng, Lin3; Liao, Jianzu4; Zeng, Kai5; Zheng, Wendi1; Zhang, Yuanfang1,2; Xu, Jie6; Zhou, Wen1

2023-10-20

10.3389/fmars.2023.1249802

FRONTIERS IN MARINE SCIENCE   影响因子和分区

2296-7745

A model was constructed to estimate Primary production (PP) and examine the effect of the dominant phytoplankton group on PP, using a dataset collected in 2019 in the South China Sea (SCS) based on phytoplankton absorption coefficient at 443nm [aph(443)] and photosynthetically active radiation (PAR). There was a significant log-log linear correlation between PP and the product of aph(443) and PAR (aph(443)xPAR), with an adjusted R2 of 0.64. The model was validated using K-fold cross-validation and an in situ dataset collected in 2018 in the SCS basin. The results showed that the model had good generalisability and was suitable across marine environments, including basin, coastal, and offshore areas. The model was more sensitive to changes in PAR than changes in aph(443). Phytoplankton in the diatom-dominant and haptophyte-dominant clusters were in the light-limited stage, and their PP values increased with increasing aph(443)xPAR. However, Prochlorococcus-dominant samples exhibited photoinhibition, and the PP values decreased with increasing aph(443)xPAR, likely due to their bio-optical characteristics. The model's predictive power was related to the photo-physiological state of dominant phytoplankton, which performs well in light-limited conditions but not in cases of massive photoinhibition. This study provides insight into the development of phytoplankton-specific aph-based PP models.

primary production phytoplankton absorption coefficient photosynthetically active radiation phytoplankton pigments marine optics

SCI

英语

其他

The author(s) declare financial support was received for the research, authorship, and/or publication of this article. Financial support for this research was provided by Science amp; Technology Fundamental Resources Investigation Program (Grant No.2022FY[2022FY100601] ; Science amp; Technology Fundamental Resources Investigation Program["41976170","42276181","41976172","41976181"] ; National Natural Science Foundation of China (NSFC)[2023A1515011703]

Environmental Sciences & Ecology ; Marine & Freshwater Biology

Environmental Sciences ; Marine & Freshwater Biology

WOS:001092374200001

FRONTIERS MEDIA SA

Web of Science

1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog LTO, Guangzhou, Peoples R China
2.Univ Chinese Acad Sci, Coll Oceanog, Beijing 100049, Peoples R China
3.Sun Yat Sen Univ, Sch Marine Sci, Zhuhai, Peoples R China
4.Guangdong Ocean Univ, Fac Chem & Environm Sci, Zhanjiang, Peoples R China
5.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
6.Univ Macau, Dept Ocean Sci & Technol, Macau, Peoples R China

Zhao, Hongwuyi,Cao, Wenxi,Deng, Lin,et al. Estimation of primary production from the light absorption of phytoplankton and photosynthetically active radiation in the South China Sea[J]. FRONTIERS IN MARINE SCIENCE,2023,10.

Zhao, Hongwuyi.,Cao, Wenxi.,Deng, Lin.,Liao, Jianzu.,Zeng, Kai.,...&Zhou, Wen.(2023).Estimation of primary production from the light absorption of phytoplankton and photosynthetically active radiation in the South China Sea.FRONTIERS IN MARINE SCIENCE,10.

Zhao, Hongwuyi,et al."Estimation of primary production from the light absorption of phytoplankton and photosynthetically active radiation in the South China Sea".FRONTIERS IN MARINE SCIENCE 10(2023).