Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 2, Pages 431-440Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.10.025
Keywords
Nitrogen; Acid deposition; Carbon sequestration; Water; Acidification; Soil; Sweden; Forest; Experiment; Ecosystem; Catchment
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Funding
- Swedish Environmental Protection Agency (Naturvardsverket)
- IVL Swedish Environmental Research Institute
- Norwegian Institute for Water Research NIVA
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The role of nitrogen (N) in acidification of soil and water has become relatively more important as the deposition of sulphur has decreased. Starting in 1991, we have conducted a whole-catchment experiment with N addition at Gardsjon, Sweden, to investigate the risk of N saturation. We have added 41 kg N ha(-1) yr(-1) as NH4NO3 to the ambient 9 kg N ha(-1) yr(-1) in fortnightly doses by means of sprinkling system. The fraction of input N lost to runoff has increased from 0% to 10%. Increased concentrations of NO3 in runoff partially offset the decreasing concentrations of SO4 and slowed ecosystem recovery from acid deposition. From 1990-2002, about 5% of the total N input went to runoff, 44% to biomass, and the remaining 51% to soil. The soil N pool increased by 5%. N deposition enhanced carbon (C) sequestration at a mean C/N ratio of 42-59 g g(-1). (C) 2010 Elsevier Ltd. All rights reserved.
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