Regime shifts in trophic status and regional nutrient criteria for the Bohai Bay, China
2021
Xie, Linping | Xu, Hanyue | Xin, Ming | Wang, Baodong | Tu, Jianbo | Wei, Qinsheng | Sun, Xia
Identifying trophic status shift and developing nutrient criteria were considered important for controlling coastal eutrophication. Based on data from 1980 to 2018, we used sequential t-test analysis of regime shifts and assessment of coastal trophic status models to detect regime shifts in trophic status in Bohai Bay (China). We identified four distinct periods: unimpaired (1980–1984), minimally impacted (1985–1994), tipping point (1995–1999) and severely degraded (2000–2018). Using the reference conditions at different trophic status, a frequency distribution analysis was performed to develop candidate nutrient criteria. By considering other factors, such as the quantity and quality of data and long-term nutrient variations, we determined recommended criteria for dissolved inorganic nitrogen (15.3 μmol L⁻¹) and phosphorus (0.42 μmol L⁻¹) in Bohai Bay. This study provides a novel and feasible approach to determine reference conditions for the determination of nutrient criteria for coastal waters.
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