Kyllmar, Katarina
- Department of Soil and Environment, Swedish University of Agricultural Sciences
Research article2015Peer reviewed
Temporal trends in phosphorus concentrations and losses from agricultural catchments in the Nordic and Baltic countries
Pengerud, Annelene; Stålnacke, Per; Bechmann, Marianne; Blicher-Mathiesen, Gitte; Iital, Arvo; Koskiaho, Jari; Kyllmar, Katarina; Lagzdins, Ainis; Povilaitis, Arvydas
Abstract
This paper in a uniform manner examines temporal trends in phosphorus (P) concentrations and losses from small and well-monitored agricultural catchments in the Nordic and Baltic countries. Thirty-four catchments (range 0.1-33 km(2)) in Norway (8), Denmark (5), Sweden (8), Finland (4), Estonia (3), Latvia (3) and Lithuania (3) were selected for the study. The time series ranged from 10 (2002-2011) to 21 years (1989-2009). The monthly P concentration and loss time series were tested for significant monotone trends (p < 0.05; two-sided test) using the partial Mann-Kendall test with stream discharge as an explanatory variable. The results show a large variation in concentrations and losses of total phosphorus (TP) among the 34 studied catchments, where the long-term mean annual losses varied from 0.09 to 7.5 kg TP ha(-1). In addition, a large interannual variability in losses within catchments was found with up to a factor of 23 between years within the same catchment. Six catchments showed downward temporal trends in the TP loss time series. One upward trend in TP losses was detected in a catchment in south-west Sweden. Eight downward trends were detected in the TP concentration time series. Overall, our results show (1) a huge variability in mean P losses and concentrations among catchments, (2) a huge temporal variability in losses within catchments and (3) few detectable changes in P losses and concentrations over the study period. The results showcase the need for implementation of mitigation strategies towards reduced P losses from agricultural landscapes in the Nordic/Baltic Sea region in order to improve P water quality and ecology in surface waters.
Keywords
phosphorus; agricultural catchments; monitoring; temporal trends; losses; concentrations
Published in
Acta Agriculturae Scandinavica, Section B - Soil and Plant Science
2015, volume: 65, number: Suppl 2, pages: 173-185
Publisher: TAYLOR & FRANCIS AS
SLU Authors
UKÄ Subject classification
Soil Science
Publication identifier
- DOI: https://doi.org/10.1080/09064710.2014.993690
Permanent link to this page (URI)
https://res.slu.se/id/publ/76035