Conceptual mini-catchment typologies for testing dominant controls of nutrient dynamics in three Nordic Countries

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Hashemi, F.; Pohle, I.; Pullens, J.W.M.; Tornbjerg, H.; Kyllmar, K.; Marttila, H.; Lepistö, A.; Kløve, B.; Futter, M.; Kronvang, B. Conceptual Mini-Catchment Typologies for Testing Dominant Controls of Nutrient Dynamics in Three Nordic Countries. Water 2020, 12, 1776. https://doi.org/10.3390/w12061776

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Title: Conceptual mini-catchment typologies for testing dominant controls of nutrient dynamics in three Nordic Countries
Author: Hashemi, Fatemeh; Pohle, Ina; Pullens, Johannes W. M; Tornbjerg, Henrik; Kyllmar, Katarina; Marttila, Hannu; Lepistö, Ahti; Klove, Bjorn; Futter, Martyn; Kronvang, Brian
Publisher: MDPI
Date: 2020
Language: en
Belongs to series: Water 12 6 (2020)
ISSN: 2073-4441
URI: http://hdl.handle.net/10138/334258
Abstract: Optimal 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 km2). 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 NO3− 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.
Subject: water quality
concentration–discharge relationship
export behaviour
hysteresis
PCA
nutrients (plants)
phosphorus
rivers
management (control)
Finland
Sweden
Denmark
nitrates
pollution
monitoring
typologies
Nordic countries
Subject (ysa): veden laatu
pitoisuus-purkautumisen suhde
viennin käyttäytyminen
epätarkkuus
PCA
ravinteet
kasvinravinteet
fosfori
joet
hallinta
nitraatit
Pohjoismaat
Suomi
Ruotsi
Tanska
typologiat
saastuminen
saasteet
monitorointi


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