Huser, Brian
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
Research article2018Peer reviewedOpen access
Huser, Brian J.; Futter, Martyn N.; Wang, Rong; Folster, Jens
We present an analysis of long-term (1988-2013; 26 years) total phosphorus (TP) concentration trends in 81 Swedish boreal lakes subject tominimal anthropogenic disturbance. Near universal increases in dissolved organic carbon (DOC) concentrations and a widespread but hitherto unexplained decline in TP were observed. Over 50% of the lakes (n = 42) had significant declining TP trends over the past quarter century (Sen's slope = 2.5% y(-1)). These declines were linked to catchment processes related to changes in climate, recovery from acidification, and catchment soil properties, but were unrelated to trends in P deposition. Increasing DOC concentrations appear to be masking in-lake TP declines. When the effect of increasing DOC was removed, the small number of positive TP trends (N = 5) turned negative and the average decline in TP increased to 3.9% y(-1). The greatest relative TP declines occurred in already nutrient poor, oligotrophic systems and TP concentrations have reached the analytical detection limit (1 mu L-1) in some lakes. In addition, ongoing oligotrophication may be exacerbated by increased reliance on renewable energy from forest biomass and hydropower. It is a cause of significant concern that potential impairments to lake ecosystem functioning associated with oligotrophication are not well handled by a management paradigm focused exclusively on the negative consequences of increasing phosphorus concentrations. (C) 2017 The Authors. Published by Elsevier B.V.
Boreal; Oligotrophication; Phosphorus; Lakes; Long-term trends; Water quality
Science of the Total Environment
2018, Volume: 613, pages: 240-249
SDG7 Ensure access to affordable, reliable, sustainable and modern energy for all
SDG6 Ensure availability and sustainable management of water and sanitation for all
Geochemistry
Oceanography, Hydrology, Water Resources
Climate Research
DOI: https://doi.org/10.1016/j.scitotenv.2017.09.067
https://res.slu.se/id/publ/88146