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Phytoplankton biomass dynamics with diffuse terrestrial nutrients pollution discharge into bay
Wei Ouyang1, Rui Wang2, Kaiyue Ji2
1State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China; Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai, 519087, China.
Chemosphere
|December 29, 2022
Summary
Diffuse terrestrial pollution impacts coastal ecosystems. Reducing nutrient loading, especially phosphorus, is key to controlling phytoplankton blooms like Enteromorpha in Jiaozhou Bay.
Area of Science:
- Marine Ecology
- Environmental Science
- Water Quality Management
Background:
- Terrestrial pollution significantly impacts coastal ecosystems, altering nutrient levels and phytoplankton dynamics.
- Jiaozhou Bay (JZB) faces ecological challenges due to diffuse terrestrial pollution, necessitating an understanding of nutrient inputs and their effects.
- Phytoplankton biomass and chlorophyll a (Chla) are critical indicators of coastal water health.
Purpose of the Study:
- To investigate the spatiotemporal variations of nitrogen (N), phosphorus (P), and Chla in JZB.
- To analyze phytoplankton biomass dynamics in response to terrestrial nutrient loading.
- To evaluate the effectiveness of pollution control measures for urbanized bays.
Main Methods:
- Utilized the Soil and Water Assessment Tool (SWAT) model to quantify nutrient loading from rivers.
- Employed remote sensing to interpret Chla concentrations and spatial distribution.
- Analyzed correlations between nutrient concentrations (TN, TP) and phytoplankton biomass.
Main Results:
- Annual average total nitrogen (TN) and total phosphorus (TP) loading were 3626.3 t and 335.6 t, influenced by land use, precipitation, and temperature.
- Chla concentration decreased from nearshore to offshore, with typical dual-cycle peaks in February and September, though Enteromorpha blooms caused multiple peaks.
- TN was more sensitive to terrestrial input than TP; phytoplankton biomass correlated more strongly with P than N in JZB.
- Enteromorpha, despite comprising 4.05% of phytoplankton biomass, significantly influenced biomass variability and responded strongly to nutrient reduction.
Conclusions:
- Phytoplankton biomass in JZB is strongly linked to phosphorus input and influenced by Enteromorpha blooms.
- Implementing a 5m filter strip scenario demonstrated a potential 35.25% efficiency in Enteromorpha biomass removal.
- Findings offer valuable insights for integrated land-sea management and pollution control strategies in urbanized coastal bays.
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