Experimental addition of nitrogen to a whole forest ecosystem at Gardsjon, Sweden (NITREX): Nitrate leaching during 26 years of treatment

0495419 - ÚVGZ 2019 RIV GB eng J - Článek v odborném periodiku
Moldan, Filip - Jutterstrom, S. E. A-K. - Hruška, Jakub - Wright, R.
Experimental addition of nitrogen to a whole forest ecosystem at Gardsjon, Sweden (NITREX): Nitrate leaching during 26 years of treatment.
Environmental Pollution. Roč. 242, NOV (2018), s. 367-374. ISSN 0269-7491. E-ISSN 1873-6424
Grant CEP: GA ČR(CZ) GA16-11571S; GA ČR(CZ) GA15-08124S
Institucionální podpora: RVO:86652079
Klíčová slova: acid deposition * magic model * european forests * organic-carbon * soil-water * catchment * chemistry * dynamics * runoff * responses * Acid deposition * Nitrogen saturation * Surface water * Soil * Catchment
Obor OECD: Environmental sciences (social aspects to be 5.7)
Impakt faktor: 5.714, rok: 2018

Chronic high deposition of nitrogen (N) to forest ecosystems can lead to increased leaching of inorganic N to surface waters, enhancing acidification and eutrophication. For 26 years nitrogen has been added as ammonium nitrate (NH4NO3) at 40 kg N ha(-1) yr(-1) to a whole forested catchment ecosystem at Gardsjon, Sweden, to experimentally simulate the transition from a N-limited to N-rich state. Over the first 10 years of treatment there was an increasing amount of nitrate (NO3-) and to a lesser extent ammonium (NH4+) lost in runoff, but then N leaching stabilised, and for the subsequent 16 years the fraction of N added lost in runoff remained at 9%. NO3- concentrations in runoff were low in the summer during the first years of treatment, but now are high throughout the year. High frequency sampling showed that peaks in NO3- concentrations generally occurred with high discharge, and were enhanced if high discharge coincided with occasions of N addition. Approximately 50% of the added N has gone to the soil. The added N is equivalent to 140 years of ambient N deposition. At current ambient levels of N deposition there thus appears to be no immediate risk of N saturation at this coniferous forest ecosystem, and by inference to other such N-limited forests in Scandinavia. (C) 2018 Elsevier Ltd. All rights reserved.
Trvalý link: http://hdl.handle.net/11104/0288411