Spatiotemporal Dissolved Silicate Variation, Sources, and Behavior in the Eutrophic Zhanjiang Bay, China
| Autor: | Jibiao Zhang, Yan-Chan Zhang, Peng Zhang, Yi Li, Jianxu Li, Jia-Lei Xu, Xin-Qi Luo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Hydraulic engineering
010504 meteorology & atmospheric sciences Water flow dissolved silicate Geography Planning and Development 010501 environmental sciences Aquatic Science 01 natural sciences Biochemistry Nutrient lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 medicine 0105 earth and related environmental sciences Water Science and Technology lcsh:TD201-500 biology Plankton Seasonality medicine.disease biology.organism_classification spatiotemporal variation coastal water Salinity Diatom Environmental chemistry Environmental science Eutrophication land-based sources Surface water Zhanjiang bay |
| Zdroj: | Water, Vol 12, Iss 3586, p 3586 (2020) Water Volume 12 Issue 12 |
| ISSN: | 2073-4441 |
| Popis: | Dissolved silicate (DSi) is an important nutrient in coastal water, which is used by planktonic diatoms for cell division and growth. In this study, surface water samples were collected in the eutrophic Zhanjiang Bay (ZJB) in 2019, covering a seasonal variation of coastal water and land-based source water discharge. The spatiotemporal DSi distribution, land-based sources flux input and behaviors in ZJB were studied and discussed. The results show that the DSi concentration had significant differences in spatiotemporal scale. The average concentration of DSi in ZJB was 38.00 ± 9.48 &mu mol· L&minus 1 in spring, 20.23 ± 11.27 &mu 1 in summer, 12.48 ± 1.42 &mu 1 in autumn and 11.96 ± 4.85 &mu 1 in winter. The spatiotemporal DSi distribution showed a decreasing gradient from the top to the mouth of ZJB, which was affected by land source inputs and hydrodynamics. The land-based sources&rsquo input concentration of DSi in ZJB ranged from 0.021 to 0.46 mol· 1, with an average of 0.14 mol· 1, and the total annual flux of DSi was 1.06 × 109 mol, comprising up to 8.28%, 41.55% and 50.17% in dry, normal, and wet seasons, respectively. The Suixi River contributed the highest DSi flux proportion in all seasons. The DSi in land-based source water was mainly affected by water flow discharge, diatom uptake and impacts from anthropogenic activities. Compared with dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP), the DSi was the limitation nutrient in ZJB. Additionally, the DSi concentration in the coastal water was negatively correlated with salinity. The seasonal DSi/DIN and DSi/DIP ratios in land-based sources discharge water was significantly higher than that in coastal water (p < 0.05). Land-based sources of DSi input played an important role in nutrients composition that sustained diatoms as the dominant species in ZJB. |
| Databáze: | OpenAIRE |
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