Spatial and seasonal variations in phosphorus speciation along a river in a lowland catchment (Warnow, Germany)

Bitschofsky, Franziska; Nausch, Monika

doi:10.1016/j.scitotenv.2018.12.009

Cited by 20 publications

(9 citation statements)

References 48 publications

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“…In particular, during summer, the thresholds for a good ecological status in surface water bodies were frequently exceeded for both DRP and TP (Figure 4). Those seasonal effects in the same catchments have been described by other authors [31]. They are often associated with point sources, which will be diluted during high flows and will be amplified during low flow [32,33].…”

Section: P Concentrations Across Different Spatial Scalessupporting

confidence: 71%

“…This might partly explain those effects for the entire Warnow river basin-e.g., 82 wastewater treatment plants are located within the basin-but not for the Zarnow, the Brook and the Ditch sub-catchments, at which point sources do not exist therein. Another explanation might be DRP release from sediment under anoxic conditions in summer [31]. Therefore, it can be assumed that the seasonal patterns for TP are probably controlled by the diluted P fractions.…”

Section: P Concentrations Across Different Spatial Scalesmentioning

confidence: 99%

“…Therefore, it can be assumed that the seasonal patterns for TP are probably controlled by the diluted P fractions. Detailed water analysis at several stations of the Warnow river basin revealed that dissolved P fractions such as DRP (due to sediment release) are dominant forms of TP in summer, whereas particulate P fractions dominate in other seasons [31]. P filters, installed at the end of drain collectors, might help to reduce P concentrations throughout a year.…”

Section: P Concentrations Across Different Spatial Scalesmentioning

confidence: 99%

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Impact of Filters to Reduce Phosphorus Losses: Field Observations and Modelling Tests in Tile-Drained Lowland Catchments

Bauwe¹,

Kahle²,

Lennartz³

2019

Water

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In this study, we analyzed Dissolved Reactive Phosphorus (DRP) and Total Phosphorus (TP) concentration dynamics over two years in surface waters of five nested catchments in northeastern Germany. Based on this, we constructed a filter box filled with iron-coated sand for Phosphorus (P) removal at the edge of a tile-drained field. Results of the filter box experiment were used for a model scenario analysis aiming at evaluating the P removal potential at catchment scale. DRP and TP concentrations were generally low but they exceeded occasionally target values. Results of the filter box experiment indicated that 28% of the TP load could be retained but the DRP load reduction was negligible. We assume that DRP could not be reduced due to short residence times and high flow dynamics. Instead, particulate P fractions were probably retained mechanically by the filter material. The scenario analysis revealed that the P removal potential of such filters are highest in areas, in which tile drainage water is the dominant P source. At a larger spatial scale, in which other P (point) sources are likewise important, edge-of-field P filters can only be one part of an integrated catchment strategy involving a variety of measures to reduce P losses.

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Section: P Concentrations Across Different Spatial Scalessupporting

confidence: 71%

Section: P Concentrations Across Different Spatial Scalesmentioning

confidence: 99%

Section: P Concentrations Across Different Spatial Scalesmentioning

confidence: 99%

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Impact of Filters to Reduce Phosphorus Losses: Field Observations and Modelling Tests in Tile-Drained Lowland Catchments

Bauwe¹,

Kahle²,

Lennartz³

2019

Water

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“…In autumn and winter, a decrease in phosphorus concentrations was expected, and in fact did occur throughout the majority of these seasons. Some peaks in concentrations can be associated to the release of phosphorus compounds from the sediments found in retention tanks, as was reported by Bitschofsky & Nausch (2019) in the Warnow catchment in Germany. The autumn increase in N-NO − 3 concentrations in comparison to the spring period, observed only in agricultural watersheds, was probably caused by washing out the fertilizing compounds applied to the fields earlier in autumn.…”

Section: Principal Component Analysissupporting

confidence: 58%

Seasonal contributions of nutrients from small urban and agricultural watersheds in northern Poland

Matej-Łukowicz

Wojciechowska

Nawrot

et al. 2020

PeerJ

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Diffuse sources of pollution like agricultural or urban runoff are important factors in determining the quality of surface waters, although they are more difficult to monitor than point sources. The objective of our study was to verify assumptions that the inflow from agricultural nutrient sources is higher than from urbanized ones. It has been done by comparing the nutrients and organic matter concentrations and loads for three small streams in northern Poland (Pomerania Region). Two streams flowing through agricultural catchments and an urban stream flowing through the city of Gdansk were analysed. Concentrations of nutrients: N-NO${}_{3}^{-}$ N-NH${}_{4}^{+}$, P-PO${}_{4}^{3-}$, total phosphorus, total nitrogen and COD were measured 1–3 times per month in the period from July 2017 to December 2018 in agricultural watersheds and from October 2016 to March 2018 for an urban stream. Seasonal changes in concentrations were analysed with descriptive statistics tools. Principal Component Analysis (PCA) was used to point out the most significant factors determining variations in nutrients and organic matter concentrations with respect to different seasons. The factors included a number of characteristics regarding the catchment and streams: total catchment area, stream length, watershed form ratio, stream slope, flow rate and land use with respect to paved areas, agricultural areas and green areas (parks, forests, meadows and pastures). Although concentrations of nitrogen compounds were higher in streams flowing through agricultural areas, our study showed that total concentrations of phosphorus were higher in the urban stream, especially in summer. In agricultural areas the summer concentrations of nutrients were not high, which was probably due to dense vegetation. The correlation between P-PO${}_{4}^{3-}$ concentration and size of agricultural area in the catchment was observed in winter when no vegetation field cover exists. Our study shows an urgent need to monitor the nutrient loads carried with urban streams especially if discharged into receivers prone to eutrophication.

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“…Different P fractions were monitored in the water column of the lowland Warnow River and its estuary in northeastern Germany monthly between August 2016 and August 2018 (Bitschofsky and Nausch, 2019;Rönspieß et al, 2020). The 3,024 km 2 catchment of the river is one of the largest catchments in Germany that discharges into the Baltic Sea.…”

Section: Introduction Connection Between P and Eutrophicationmentioning

confidence: 99%

Bioavailability of Various Phosphorus Fractions and Their Seasonality in a Eutrophic Estuary in the Southern Baltic Sea – A Laboratory Approach

2021

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Phosphorus (P) is a major driver of eutrophication, especially in anthropogenically impacted coastal waters, and determining its bioavailability is important for providing a good estimation of the eutrophication potential in aquatic systems. Therefore, we observed the bioavailability of P in four laboratory experiments on water samples collected in March, June, September, and December 2018. In the experiments, all P fractions of the sampled water were investigated in three treatments (“unfiltered” and “10 μm”- and “1.2 μm”-filtered). The bioavailability (utilization by organisms within several days) ranged from 9 to 100% for dissolved P, and 34 to 100% for particulate P. However, one of the particulate P fractions was bound in biomass and therefore was not directly bioavailable. The conditions in the March experiment represented a natural spring bloom with a residual potential for planktonic growth. In June and September, the nutrients needed for growth were depleted in the different treatments. In December, a spring bloom was simulated by the laboratory conditions. Preferential P uptake by a specific group of organisms could not be observed directly, although a trend of higher utilization of dissolved P by heterotrophic bacteria was observed. In conclusion, the bioavailable P (sum of dissolved P fractions and one particulate P fraction) accounted for between 20 and 94% of the total P. Consequently, our experiments demonstrated that the commonly monitored P fractions lead to an underestimation of the bioavailable P and thus of potential for eutrophication in aquatic systems, too.

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Spatial and seasonal variations in phosphorus speciation along a river in a lowland catchment (Warnow, Germany)

Cited by 20 publications

References 48 publications

Impact of Filters to Reduce Phosphorus Losses: Field Observations and Modelling Tests in Tile-Drained Lowland Catchments

Impact of Filters to Reduce Phosphorus Losses: Field Observations and Modelling Tests in Tile-Drained Lowland Catchments

Seasonal contributions of nutrients from small urban and agricultural watersheds in northern Poland

Bioavailability of Various Phosphorus Fractions and Their Seasonality in a Eutrophic Estuary in the Southern Baltic Sea – A Laboratory Approach

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