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.
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. n class="Gene">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.
Authors: S A Norton; I J Fernandez; J S Kahl; L E Rustad; Tomás Navrátil; H Almquist Journal: Environ Monit Assess Date: 2010-06-17 Impact factor: 2.513
Authors: Winfried Schröder; Stefan Nickel; Simon Schönrock; Michaela Meyer; Werner Wosniok; Harry Harmens; Marina V Frontasyeva; Renate Alber; Julia Aleksiayenak; Lambe Barandovski; Alejo Carballeira; Helena Danielsson; Ludwig de Temmermann; Barbara Godzik; Zvonka Jeran; Gunilla Pihl Karlsson; Pranvera Lazo; Sebastien Leblond; Antti-Jussi Lindroos; Siiri Liiv; Sigurður H Magnússon; Blanka Mankovska; Javier Martínez-Abaigar; Juha Piispanen; Jarmo Poikolainen; Ion V Popescu; Flora Qarri; Jesus Miguel Santamaria; Mitja Skudnik; Zdravko Špirić; Trajce Stafilov; Eiliv Steinnes; Claudia Stihi; Lotti Thöni; Hilde Thelle Uggerud; Harald G Zechmeister Journal: Environ Sci Pollut Res Int Date: 2016-04-12 Impact factor: 4.223