Effectiveness of phosphorus control under extreme heatwaves: implications for sediment nutrient releases and greenhouse gas emissions

Abstract Eutrophication has been identified as the primary cause of water quality deterioration in inland waters worldwide, often associated with algal blooms or fish kills. can be controlled through watershed management and in-lake measures. An extreme heatwave event, its impact on mineralization rates internal nutrient loading (phosphorus—P, nitrogen—N), could counteract eutrophication control We investigated how effectiveness a abatement technique is impacted by an heatwave, to what extent biogeochemical processes are modulated exposure heatwaves. To this end, we carried out sediment-incubation experiment, testing lanthanum-modified bentonite (LMB) reducing nutrients greenhouse gas emissions from eutrophic sediments, without heatwave. Our results indicate that LMB may compromised upon event. This was evidenced increase concentration 0.08 ± 0.03 mg P/L overlying volume 863 21 mL, equalling 11% increase, effects lasting end experiment. application generally showed no effect nitrogen species, while stimulated nitrification, resulting ammonium loss accumulation dissolved oxidized species well increased nitrous oxide concentrations. In addition, carbon dioxide (CO 2 )-equivalent more than doubled during relative reference temperature, had mitigating them. sediment incubation experiment indicates significantly accelerated exposure, change fluxes between water. The current efforts will face challenges under future climate scenarios frequent intense events predicted IPCC.