Spatiotemporal changes of biogenic elements in the Changjiang River Estuary and adjacent waters in summer over the last decade
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Abstract: The long-term spatiotemporal changes of surface biogenic elements in the Changjiang River Estuary and adjacent waters during the summer of 2008−2016 were analyzed in this study. The concentrations of dissolved inorganic nitrogen (DIN), soluble reactive phosphate (
${{\rm {PO}}_4^{3-}} $ ) and silicate (${{\rm {SiO}}_3^{2-}} $ ) were generally stable, with a slight decrease of DIN and${{\rm {PO}}_4^{3-}} $ , and a slight increase of${{\rm {SiO}}_3^{2-}} $ , which mainly occurred in the estuarine waters. The grey correlation analysis was carried out between biogenic elements and chlorophyll a (Chl-a). Results showed that compared with the absolute values of biogenic elements, the correlations between the concentration ratio of nitrogen to phosphorus (N/P), ratio of silicon to nitrogen (Si/N) and Chl-a were closer, indicating the important influence on phytoplankton by the structure of biogenic elements. The study area was generally in a state of potential P limitation, and could have potential impact on the phytoplankton community, triggering the shift of red tide dominant species from diatoms to dinoflagellates.-
Key words:
- Changjiang River Estuary /
- biogenic elements /
- spatiotemporal changes
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Figure 3. Spatiotemporal changes of surface biogenic elements in the Changjiang River Estuary and adjacent waters by grids during the summer of 2008−2016. a. DIN concentration change; b.
${{\rm {PO}}_4^{3-}} $ concentration change; c.${{\rm {SiO}}_3^{2-}} $ concentration change; d. N/P molar concentration ratio change; e. Si/N molar concentration ratio change.Figure 4. Spatial distribution of surface biogenic elements in the Changjiang River Estuary and adjacent waters during the summer of 2008−2016. a. DIN concentration; b.
${{\rm {PO}}_4^{3-}} $ concentration; c.${{\rm {SiO}}_3^{2-}} $ concentration; d. N/P molar concentration ratio; e. Si/N molar concentration ratio.Table 1. Correlation between biogenic elements and chlorophyll a
Factors Grey correlation degree Rank DIN concentration 0.744 4 ${{\rm {PO}}_4^{3-}} $ concentration 0.566 5 ${{\rm {SiO}}_3^{2-}} $ concentration 0.854 3 N/P molar concentration ratio 0.924 1 Si/N molar concentration ratio 0.922 2 Table 2. Biogenic elements limitation in the Changjiang River Estuary and adjacent areas
Year N limitation P limitation Si limitation 2008 0.3% 98.0% 0.6% 2009 0.8% 93.8% 2.0% 2010 0 86.3% 0 2011 0 99.2% 0 2012 0 96.9% 0 2013 0.3% 97.8% 0.3% 2014 0 99.7% 0 2015 0.3% 91.9% 0.3% 2016 0 99.2% 0 -
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