Temporal and spatial variation of nitrogen and phosphorus and eutrophication assessment for a typical arid river — Fuyang River in northern China

Abstract

Based on water quality surveys over 2years (July to December, in 2014 and 2015) in a typical arid river in northern China the Xingtai segment of the Fuyang River basin - the variation of nitrogen (N) and phosphorus (P) was analyzed. The extent of water eutrophication of this segment was also assessed using a universal index formula for eutrophic evaluation and a logarithmic power function. The results showed that the average concentration of total N (TN) was 27.2mg/L (NH-N, 63.5%), total P (TP) was 2.0mg/L (solution reactive phosphorus, 68.8%). Temporal and spatial variations of N and P in this segment were observed. Concentrations of N and P in the arid season were higher than those in the rainy season. Spatially, the N and P concentrations followed the same trend; i.e., higher in the city segment than in the suburbs, and decreasing along the river. The water eutrophication in the studied segment reached extremely high levels at all times (eutrophication index ≥76.3). Spatially, its trend was clearly linked with N and P. Water shortage, pollution accumulation and a weak self-purification function are the main reasons for the prominent eutrophication in this segment.

A Comparison Study of Runoff Characteristics of Non-Point Source Pollution from Three Watersheds in South Korea

“…According to Xiang et al [4], many studies related to non-point source pollution have been conducted, including research on pollution characteristics, modeling, and management. Other studies have identified the causes of non-point source pollution, quantified non-point pollutant loads, and established measures for reducing the pollutant loads [5][6][7][8][9]. However, non-point source pollution is affected by various factors, and thus difficult to characterize common non-point source pollution applicable to watersheds in particular [10].…”

Spatial and Temporal Variations in Environmental Variables in Relation to Phytoplankton Community Structure in a Eutrophic River-Type Reservoir

“…Eutrophication, manifested by severe algae blooms, is globally the most pervasive water quality challenge [1][2][3]. It perturbs ecosystem services of the aquatic systems and decreases biodiversity [3][4][5].…”

Variación espacial y temporal de nutrientes y total de sólidos en suspensión en la cuenca de un río de alta montaña tropical

“…En la cuenca del río Negro esto se intensifica debido a las altas pendientes y a los diversos usos del suelo, como el agropecuario (Cornare, 2006;. En el río Fuyang, norte de China, se obtuvieron resultados parecidos, también asociados con las estaciones del clima, con mayores concentraciones de nitrógeno y fósforo en la temporada de lluvias que en la estación seca (Zhang, et al, 2017).…”

“…Es evidente que la calidad física y química del agua está relacionada con los eventos que ocurren en la cuenca y depende en gran medida del uso del suelo, del tratamiento de los efluentes de aguas servidas y del control de la erosión, entre otros. A nivel mundial hay un buen número de estudios que analizan el comportamiento de distintas variables físicas y químicas a escala de cuenca, en especial las variaciones en los parámetros asociados con los macronutrientes (nitrógeno y fósforo) y los sólidos en suspensión (Soria, et al, 1987;Rivas, et al, 2005;Rivas, et al, 2009;Giraldo, et al, 2010;Benjumea, et al, 2014;Zhang, et al, 2017;Mamun, et al, 2018). El conocimiento de las variaciones en las concentraciones de nutrientes y de sólidos en suspensión a lo largo del tiempo y en los diversos espacios de las fuentes hídricas es de gran relevancia para el desarrollo de las políticas públicas a cargo de las autoridades competentes para la adecuada gestión y control del recurso hídrico superficial en las diferentes cuencas.…”