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Experimental addition of nitrogen to a whole forest ecosystem at Gårdsjön, Sweden (NITREX): Nitrate leaching during 26 years of treatment
IVL Svenska Miljöinstitutet.
IVL Svenska Miljöinstitutet.
2018 (engelsk)Inngår i: Environmental Pollution, ISSN 1566-0745, Vol. 242, s. 367-374Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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 40kgN ha-1 yr-1 to a whole forested catchment ecosystem at Gårdsjön, 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.

sted, utgiver, år, opplag, sider
2018. Vol. 242, s. 367-374
Identifikatorer
URN: urn:nbn:se:ivl:diva-3664OAI: oai:DiVA.org:ivl-3664DiVA, id: diva2:1572874
Merknad
A-rapport, A2337Tilgjengelig fra: 2021-06-24 Laget: 2021-06-24

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