Quantifying nutrient transfer pathways in agricultural catchments using high temporal resolution data

Article

Mellander, Per-Erik, Melland, Alice R., Jordan, Phil, Wall, David P., Murphy, Paul N. C. and Shortle, Ger. 2012. "Quantifying nutrient transfer pathways in agricultural catchments using high temporal resolution data." Environmental Science and Policy. 24, pp. 44-57. https://doi.org/10.1016/j.envsci.2012.06.004
Article Title

Quantifying nutrient transfer pathways in agricultural catchments using high temporal resolution data

ERA Journal ID36370
Article CategoryArticle
AuthorsMellander, Per-Erik (Author), Melland, Alice R. (Author), Jordan, Phil (Author), Wall, David P. (Author), Murphy, Paul N. C. (Author) and Shortle, Ger (Author)
Journal TitleEnvironmental Science and Policy
Journal Citation24, pp. 44-57
Number of Pages14
Year2012
PublisherElsevier
Place of PublicationNew York, NY. United States
ISSN1462-9011
1873-6416
Digital Object Identifier (DOI)https://doi.org/10.1016/j.envsci.2012.06.004
Abstract

There are uncertainties in the definition of phosphorus (P) and nitrogen (N) transfer pathways within agricultural river catchments due to spatiotemporal variations such as water recharge and the farming calendar, or catchment soil and hydrogeological properties. This can have implications for mitigation policies. This study combined detailed pathway studies with catchment integrated studies to characterise N and P transfer pathways for four agricultural catchments with different land management, soil drainage and geology. A Loadograph Recession Analysis (LRA) method is introduced, to identify and quantify integrated delivery transfer pathways of total oxidised nitrogen (TON), total reactive phosphorus (TRP) and total phosphorus (TP). High temporal resolution river discharge and water quality measurements from a large runoff event (and recession) were used. In two catchments with well drained soils, below-ground delivery pathways of TON represented up to 97% of the total flow event load, and up to 63% of the TRP and TP load. In these catchments, hydrological quick flow pathways were only 2-8% of total flow but were efficient in delivering P (up to 50%). Two other catchments had poor to moderately drained soils where up to 55% of the hydrological pathways were quick flow. This quick flow delivered up to 88% of the event flow P load but background groundwater flows were apparently mixed with point source signals. Results suggest that, in catchments with permeable soils and geology, subsurface pathways will need to be considered for mitigation strategies for both diffuse N and P delivery and measures that target surface transfer pathways such as riparian buffer strips may be ineffective. In such catchments, long chemical recessions from storm events may prolong impacts on the ecological status of receiving rivers.

Keywordsbaseflow; EMMA; mitigation measures; nitrogen; phosphorus; quick flow
ANZSRC Field of Research 2020300206. Agricultural spatial analysis and modelling
370799. Hydrology not elsewhere classified
409901. Agricultural engineering
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Byline AffiliationsTeagasc Agriculture and Food Development Authority, Ireland
University of Ulster, United Kingdom
Institution of OriginUniversity of Southern Queensland
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