Title：
Nitrate budget of a terrestrial-to-marine continuum in South China: Insights from isotopes and a Markov chain Monte Carlo model
Authors：
Corresponding
Author：
Shaomei Yang, Yan Deng, Junlin Shu, Xin Luo, Xiaoyan Peng, Ke Pan, Hao Jiang*
Pubyear：
2024
Title of
Journal：
Marine Pollution Bulletin
Paper
Code：
Volume：
199
Number：
Page：
116000
Others：
Classification：
Source：
Abstract：
Anthropogenic nitrate (NO3-) production has been increasing and is exported to the ocean via river networks, causing eutrophication and ecological damage. While studies have focused on river NO3 pollution, what has been lacking is the quantification of the sources of NO3- in coastal rivers. This study applied the dual isotopes (delta N-15/delta O-18-NO3-) to quantify the sources and their fluxes of NO3- in two inflow rivers of the Qinzhou Bay. By adding our results to the NO3- source apportionment in Qinzhou Bay, we, for the first time, established the NO3- budgets of the terrestrial-to-marine continuum in both high- and low-flow seasons. We quantitatively showed the direct and indirect roles (e.g., the stimulation of nitrification by sewage ammonium-NH4+) of terrestrial sources in driving the high NO3- loading in the estuary. The results highlighted the necessity to consider coastal rivers and estuary as a whole, which could shed light on the effective reduction of NO3- pollution in coastal environments.
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