Research article - Peer-reviewed, 2020
Conceptual Mini-Catchment Typologies for Testing Dominant Controls of Nutrient Dynamics in Three Nordic CountriesHashemi, Fatemeh; Pohle, Ina; Pullens, Johannes W. M.; Tornbjerg, Henrik; Kyllmar, Katarina; Marttila, Hannu; Lepisto, Ahti; Klove, Bjorn; Futter, Martyn; Kronvang, Brian
AbstractOptimal nutrient pollution monitoring and management in catchments requires an in-depth understanding of spatial and temporal factors controlling nutrient dynamics. Such an understanding can potentially be obtained by analysing stream concentration-discharge (C-Q) relationships for hysteresis behaviours and export regimes. Here, a classification scheme including nine different C-Q types was applied to a total of 87 Nordic streams draining mini-catchments (0.1-65 km(2)). The classification applied is based on a combination of stream export behaviour (dilution, constant, enrichment) and hysteresis rotational pattern (clock-wise, no rotation, anti-clockwise). The scheme has been applied to an 8-year data series (2010-2017) from small streams in Denmark, Sweden, and Finland on daily discharge and discrete nutrient concentrations, including nitrate (NO3-), total organic N (TON), dissolved reactive phosphorus (DRP), and particulate phosphorus (PP). The dominant nutrient export regimes were enrichment for NO(3)(-)and constant for TON, DRP, and PP. Nutrient hysteresis patterns were primarily clockwise or no hysteresis. Similarities in types of C-Q relationships were investigated using Principal Component Analysis (PCA) considering effects of catchment size, land use, climate, and dominant soil type. The PCA analysis revealed that land use and air temperature were the dominant factors controlling nutrient C-Q types. Therefore, the nutrient export behaviour in streams draining Nordic mini-catchments seems to be dominantly controlled by their land use characteristics and, to a lesser extent, their climate.
Keywordswater quality; concentration-discharge relationship; export behaviour; hysteresis; PCA
2020, volume: 12, number: 6, article number: 1776
James Hutton Inst
Pullens, Johannes W. M.
Finnish Environm Inst
Swedish University of Agricultural Sciences, Department of Aquatic Sciences and Assessment
Sustainable Development Goals
SDG6 Clean water
UKÄ Subject classification
Oceanography, Hydrology, Water Resources
URI (permanent link to this page)