Assessment of Long-Term Watershed Management on Reservoir Phosphorus Concentrations and Export Fluxes

Abstract

Source water nutrient management to prevent eutrophication requires critical strategies to reduce watershed phosphorus (P) loadings. Shanxi Drinking-Water Source Area (SDWSA) in eastern China experienced severe water quality deterioration before 2010, but showed considerable improvement following application of several watershed management actions to reduce P. This paper assessed the changes in total phosphorus (TP) concentrations and fluxes at the SDWSA outlet relative to watershed anthropogenic P sources during 2005–2016. Overall anthropogenic P inputs decreased by 21.5% over the study period. Domestic sewage, livestock, and fertilizer accounted for (mean ± SD) 18.4 ± 0.6%, 30.1 ± 1.9%, and 51.5 ± 1.5% of total anthropogenic P inputs during 2005–2010, compared to 24.3 ± 2.7%, 8.8 ± 10.7%, and 66.9 ± 8.0% for the 2011–2016 period, respectively. Annual average TP concentrations in SDWSA decreased from 0.041 ± 0.019 mg/L in 2009 to 0.025 ± 0.013 mg/L in 2016, a total decrease of 38.2%. Annual P flux exported from SDWSA decreased from 0.46 ± 0.04 kg P/(ha·a) in 2010 to 0.25 ± 0.02 kg P/(ha·a) in 2016, a decrease of 44.9%. The success in reducing TP concentrations was mainly due to the development of domestic sewage/refuse collection/treatment and improved livestock management. These P management practices have prevented harmful algal blooms, providing for safe drinking water.

Nutrient Pollutants in Surface Water—Assessing Trends in Drinking Water Resource Quality for a Regional City in Central Europe

“…Over the investigated period total nitrogen concentrations in the Wisłok River were reduced by 17%, ammonium nitrogen by 55%, Kiejdahl nitrogen by 35%, nitrate nitrogen by 7%, anthropogenic phosphorus by 23% and phosphates by 27%. A similar situation was observed in eastern China, where management of water nutrients to prevent eutrophication caused a decline in anthropogenic P in the water by 21.5% [60].…”

Billings Reservoir (Brazil): Chemical Studies on Water and Chemical and Morphological Studies on Zebrafish Gills

“…The water samples from RP, RG, and BO rivers presented high levels of phosphorus. It is known that wastewater from urban and industrial sewage are import sources of phosphorus (Huang et al, 2018;Liu et al, 2018). The use of phosphorus detergent as well as phosphate fertilizers are also major causes for the high total phosphorus content in water reservoirs (Liu et al, 2018).…”

Rapid detection of Chattonella marina by PCR combined with dot lateral flow strip

“…Harmful algal blooms (HABs) refer to natural phenomena of mass propagation of algal cells in a short period due to the eutrophication of seawater, which usually can cause massive mortality of aquatic animals (Foss et al 2019). In recent years HABs have become an increasingly serious environmental problem and pose a threat to human health (Huang et al 2018) and sustainable development of the marine economy (Wang et al 2017a). Therefore, it is essential to establish effective and convenient techniques for the early detection of harmful algae to take timely and effective measures to reduce the potential economic damage caused by HABs.…”