AI Article Synopsis
- This study examined the isotopes of nitrates in water samples from Lake Sihwa to identify the various sources of nitrate pollution linked to different land uses like urban areas, industry, wetlands, and agriculture.
- Researchers found that after a typhoon, the total nitrogen levels increased, suggesting that nitrogen-rich conditions might lead to harmful algal blooms.
- Isotopic data indicated that most of the nitrogen input came from urban sources, highlighting the potential of using isotopic analysis for better water quality management in areas affected by human activities.
Article Abstract
This study investigated the nitrate dual isotopic compositions (δN and δO) of water samples to trace nitrate sources in Lake Sihwa, which encompasses various land-use types (e.g., urban, industry, wetland, and agriculture). The biogeochemical interactions of anthropogenic nitrogen sources (e.g., soil, road dust, and septic water) were also evaluated through multiple pathways from terrestrial boundaries to the water column. Based on increased concentrations of dissolved total nitrogen (DTN; 3.1 ± 1.6 mg/L) after typhoon, the variation of element stoichiometry (N:P:Si) in this system shifted to the relatively N-rich conditions (DIN/DIP; 14.1 ± 8.1, DIN/DSi; 1.4 ± 1.8), potentially triggering the occurrence of harmful algal blooms. Furthermore, discriminative isotopic compositions (δN; 4.0 ± 2.1 ‰, δO; 6.1 ± 4.3 ‰) after the typhoon suggested the increased DTN input of anthropogenic origins within Lake Sihwa would be mainly transported from urban sources (76 ± 9 %). Consequently, the isotopic-based approach may be useful for effective water quality management under increased anthropogenic activities near aquatic systems.
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| http://dx.doi.org/10.1016/j.marpolbul.2024.116324 | DOI Listing |
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Article Synopsis
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