Increased nitrogen in runoff and soil following 13 years of experimentally increased nitrogen deposition to a coniferous-forested catchment at Gårdsjön, Sweden

Environmental Pollution
F MoldanR F Wright

Abstract

Beginning in 1991, we have added nitrogen (N) to the 0.5-ha, N-poor, coniferous-forested catchment G2 NITREX at Gårdsjön, Sweden, to investigate the consequences of chronic elevated N deposition. We have added 40 kg N ha-1 yr-1 in fortnightly doses of NH4NO3 to the ambient 15 kg N ha-1 yr-1 by means of a sprinkling system. NO3 concentrations in runoff increased during 13 years from<1 to 70 microeq L-1, and in 2004 comprised about 10% of N input. Inhibition of NO3 immobilisation due to increased availability of NH4 might explain the increased leaching of NO3. C and N pools in the forest floor increased but C/N ratio has not changed. The increase in NO3 leaching thus occurred independently of change in C/N ratio. The results from Gårdsjön demonstrate that increased leaching of inorganic N and decrease in C/N ratio respond to increased N deposition at greatly different time scales.

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Citations

Jun 18, 2010·Environmental Monitoring and Assessment·S A NortonH Almquist
Jan 8, 2013·Environmental Science and Pollution Research International·Qichun ZhangSayed Hussain
Apr 14, 2016·Environmental Science and Pollution Research International·Winfried SchröderHarald G Zechmeister
Jul 26, 2008·Environmental Pollution·Chris D EvansBrian Reynolds
Jan 17, 2021·The Science of the Total Environment·Wim W WesselAlbert Tietema
Jun 24, 2010·Environmental Science & Technology·Thorjørn LarssenRichard F Wright

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