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Climate effects on land management and stream nitrogen concentrations in small agricultural catchments in Norway.

https://arctichealth.org/en/permalink/ahliterature304762
Source
Ambio. 2020 Nov; 49(11):1747-1758
Publication Type
Journal Article
Date
Nov-2020
Author
Hannah Wenng
Marianne Bechmann
Tore Krogstad
Eva Skarbøvik
Author Affiliation
Norwegian Institute for Bioeconomy Research (NIBIO), Norwegian University of Life Science (NMBU), Fredrik A. Dahls vei 20, 1430, Ås, Norway. hannah.wenng@nibio.no.
Source
Ambio. 2020 Nov; 49(11):1747-1758
Date
Nov-2020
Language
English
Publication Type
Journal Article
Keywords
Agriculture
Conservation of Natural Resources
Environmental monitoring
Nitrogen - analysis
Norway
Rivers
Abstract
Land use and climate change can impact water quality in agricultural catchments. The objectives were to assess long-term monitoring data to quantify changes to the thermal growing season length, investigate farmer adaptations to this and examine these and other factors in relation to total nitrogen and nitrate water concentrations. Data (1991-2017) from seven small Norwegian agricultural catchments were analysed using Mann-Kendall Trend Tests, Pearson correlation and a linear mixed model. The growing season length increased significantly in four of seven catchments. In catchments with cereal production, the increased growing season length corresponded to a reduction in nitrogen concentrations, but there was no such relationship in grassland catchments. In one cereal catchment, a significant correlation was found between the start of sowing and start of the thermal growing season. Understanding the role of the growing season and other factors can provide additional insight into processes and land use choices taking place in agricultural catchments.
PubMed ID
32918719 View in PubMed
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Comparing nutrient reference concentrations in Nordic countries with focus on lowland rivers.

https://arctichealth.org/en/permalink/ahliterature304742
Source
Ambio. 2020 Nov; 49(11):1771-1783
Publication Type
Journal Article
Date
Nov-2020
Author
Eva Skarbøvik
Jukka Aroviita
Jens Fölster
Anne Lyche Solheim
Katarina Kyllmar
Katri Rankinen
Brian Kronvang
Author Affiliation
Norwegian Institute for Bioeconomy Research, NIBIO, P.O. Box. 115, 1431, Ås, Norway. eva.skarbovik@nibio.no.
Source
Ambio. 2020 Nov; 49(11):1771-1783
Date
Nov-2020
Language
English
Publication Type
Journal Article
Keywords
Agriculture
Environmental monitoring
Finland
Nitrogen - analysis
Norway
Nutrients
Phosphorus - analysis
Rivers
Scandinavian and Nordic Countries
Sweden
Abstract
Reference conditions of water bodies are defined as the natural or minimal anthropogenically disturbed state. We compared the methods for determining total phosphorus and total nitrogen concentrations in rivers in Finland, Norway and Sweden as well as the established reference conditions and evaluated the possibility for transfer and harmonisation of methods. We found that both methods and values differed, especially for lowland rivers with a high proportion of agriculture in the catchment. Since Denmark has not yet set reference conditions for rivers, two of the Nordic methods were tested for Danish conditions. We conclude that some of the established methods are promising but that further development is required. We moreover argue that harmonisation of reference conditions is needed to obtain common benchmarks for assessing the impacts of current and future land use changes on water quality.
PubMed ID
32930955 View in PubMed
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