Impacts of Anthropogenic Land Use Changes on Nutrient Concentrations in Surface Waterbodies: A Review

Delkash, Madjid; Al-Faraj, Furat; Scholz, Miklas

doi:10.1002/clen.201800051

Cited by 41 publications

(23 citation statements)

References 83 publications

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“…Preliminary studies of Delkash et.al., Huang et.al., Sylaios et.al. [14][15][16] confirm the conclusions of this study that as the percentage of agricultural areas increases, concentrations of TN and NO3-N increase.…”

Section: Fig 2 Scatterplot Of No3-n Concentrations (Mg•l -1 ) Vs Percentage Of Wetlands (A) and Nh4-n Concentrations (Mg•l -1 ) Vs Percensupporting

confidence: 86%

Relationships between land use and nitrogen and phosphorus concentrations in Berze river basin

Siksnāne

Lagzdiņš

2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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According to the latest HELCOM eutrophication assessment excessive inputs of nitrogen and phosphorus to the riverine and marine environments are one of the main reasons for water quality deterioration in the Baltic Sea. Both nitrogen and phosphorus are natural elements in terrestrial and aquatic ecosystems as essential for the plant growth. There are many factors both natural and anthropogenic that impact the amount of excess nutrients discharged in streams and rivers. This research examines how catchment area characteristics in terms of share of different land uses influence nutrient concentrations in water at a sub-basin level. Using the CORINE Land Cover 2018 data and results of Agricultural Runoff Monitoring Programme, as collected in the fifteen Berze river sub-basins during the time period of 2005-2020, the relationships between land use and concentrations of nitrate-nitrogen (NO3-N), ammonium-nitrogen (NH4-N), total nitrogen (TN), orthophosphate-phosphorus (PO4-P), and total phosphorus (TP) were assessed. In general, the results suggest that with increasing proportion of agricultural land in the catchment area the mean TN, NO3-N, TP, PO4-P concentrations in water are expected to increase. Contrary to agricultural land with increasing proportion of forest and semi-natural areas, the mean TN, NO3-N, TP, PO4-P concentrations in water decrease. With higher proportion of water bodies in the catchment area, the mean concentrations of NH4-N in water decrease as well. The conclusions of this study can be used to evaluate the current situation in the catchment areas where no water quality sampling and hydrology measurements are carried out, as well as for planning purposes of land use change in a given catchment area, which allows to forecast future changes in water quality.

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Section: Fig 2 Scatterplot Of No3-n Concentrations (Mg•l -1 ) Vs Percentage Of Wetlands (A) and Nh4-n Concentrations (Mg•l -1 ) Vs Percensupporting

confidence: 86%

Relationships between land use and nitrogen and phosphorus concentrations in Berze river basin

Siksnāne

Lagzdiņš

2021

20th International Scientific Conference Engineering for Rural Development Proceedings

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“…is distorted by the fact that both the quantity and quality of terrestrial runoff vary substantially depending on local land-use (Delkash et al, 2018). The chosen method of rolling (moving) average analysis proved to be effective in identifying the patches in the Chl-a data (Supplementary Figure S4).…”

Section: Chlorophyll Patchinessmentioning

confidence: 99%

Ubiquitous Patchiness in Chlorophyll a Concentration in Coastal Archipelago of Baltic Sea

Scheinin¹,

Asmala

2020

Front. Mar. Sci.

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Productivity and trophic status of aquatic systems is traditionally quantified by chlorophyll a measurements. Environmental conditions and ecological interactions cause variability in chlorophyll a abundance. In coastal ecosystems, shallow and complex bathymetry reduces vertical heterogeneity, but promotes horizontal heterogeneity. However, coastal monitoring programs and scientific surveys are primarily focused on the vertical dimension. Here we demonstrate the spatial patchiness of chlorophyll a in coastal waters. We collected horizontally detailed and extensive in situ chlorophyll a data from the coastal Baltic Sea (SW Finland), covering the ice-free season of an annual cycle. Altogether, more than 200,000 observations were logged by an automated underway measurement system equipped with an optical sensor connected to a flow-through system. We analyzed the spatial heterogeneity of calibrated chlorophyll a data by using multiple statistical approaches, and quantified the chlorophyll a patches using a rolling average filter. We were able to identify patches and quantify their abundance and size for each of the 11 sampling campaigns. On average, 285 patches, ranging from 0.6 to 3142 m in size, were observed on the 830 km sampling transect. The average size of the patches was 237 (95% CI 226-248) m, most patches being between 10 and 1000 m. Our results show that patches of chlorophyll a can be effectively identified and quantified by modern in situ optical instrumentation. Such information is both theoretically and practically relevant. First, these results increase our understanding of the overall heterogeneity of the coastal environment. Further, they demonstrate the value of knowing the magnitude and occurrence of chlorophyll a patchiness in accurate detection of changes in coastal ecosystems caused by increased inputs of nutrients.

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“…In many African countries, increasing and more intensive cultivation of land, driven by rising populations, leads to land degradation, notably soil erosion, mineral depletion, and altered patterns of surface run-off and infiltration. These pressures can reduce nutrient retention in soils and increase nutrients loads into surface waters (Scholz, Delkash, & Al-Faraj, 2018). Intensive cropping and increased use of fertilizer and animal manures increase nutrient loads into surface waters (Duncan, 2014;Gasparini, Cunha, Bottino, & Calijuri, 2010).…”

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confidence: 99%

Evaluating the effect of diffuse and point source nutrient transfers on water quality in the Kombolcha River Basin, an industrializing Ethiopian catchment

et al. 2018

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Many catchments in sub‐Saharan Africa are subject to multiple pressures, and addressing only point sources from industry does not resolve more widespread diffuse pollution from sediment and nutrient loads. This paper reports on a preliminary study of nutrient transfers into rivers in two catchments in the industrializing city of Kombolcha, North Central Ethiopia. Sampling of rivers and industrial effluents was done over two sampling periods in the wet season of 2013 and 2014. Catchments boundaries and land use map were generated from remote sensing and ground data. Higher total nitrogen (TN) concentrations were found from sub‐catchments with largest agricultural land use, whereas highest total phosphorus (TP) was associated with sub‐catchments with hilly landscapes and forest lands. Emissions from brewery and meat processing were rich in nutrients (median TN: 21–44 mg L−1; TP: 20–58 mg L−1) but contributed on average only 10% (range 4–80%) of the TN and 13% (range 3–25%) of the TP loads. Nutrient concentrations in the rivers exceeded environmental quality standards for aquatic life protection, irrigation, and livestock water supply. In Ethiopia, more than 85% of farmers operate on less than 2 ha of land, with concomitant pressure for more intensive farming. Land is exclusively owned by the State, reducing a sense of land stewardship. As the City of Kombolcha moves to agricultural intensification and increased industrialization, attention is needed to fill gaps in monitoring of nutrient pollution in rivers and use information to reconcile development with land use and its degradation.

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Impacts of Anthropogenic Land Use Changes on Nutrient Concentrations in Surface Waterbodies: A Review

Cited by 41 publications

References 83 publications

Relationships between land use and nitrogen and phosphorus concentrations in Berze river basin

Relationships between land use and nitrogen and phosphorus concentrations in Berze river basin

Ubiquitous Patchiness in Chlorophyll a Concentration in Coastal Archipelago of Baltic Sea

Evaluating the effect of diffuse and point source nutrient transfers on water quality in the Kombolcha River Basin, an industrializing Ethiopian catchment

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