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Sinks for nitrogen inputs in terrestrial ecosystems: a meta-analysis of 15N tracer field studies
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2012 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 93, no 8, p. 1816-1829Article in journal (Refereed) Published
Abstract [en]

Effects of anthropogenic nitrogen (N) deposition and the ability of terrestrial ecosystems to store carbon (C) depend in part on the amount of N retained in the system and its partitioning among plant and soil pools. We conducted a meta‐analysis of studies at 48 sites across four continents that used enriched 15N isotope tracers in order to synthesize information about total ecosystem N retention (i.e., total ecosystem 15N recovery in plant and soil pools) across natural systems and N partitioning among ecosystem pools. The greatest recoveries of ecosystem 15N tracer occurred in shrublands (mean, 89.5%) and wetlands (84.8%) followed by forests (74.9%) and grasslands (51.8%). In the short term (<1 week after 15N tracer application), total ecosystem 15N recovery was negatively correlated with fine‐root and soil 15N natural abundance, and organic soil C and N concentration but was positively correlated with mean annual temperature and mineral soil C:N. In the longer term (3–18 months after 15N tracer application), total ecosystem 15N retention was negatively correlated with foliar natural‐abundance 15N but was positively correlated with mineral soil C and N concentration and C : N, showing that plant and soil natural‐abundance 15N and soil C:N are good indicators of total ecosystem N retention. Foliar N concentration was not significantly related to ecosystem 15N tracer recovery, suggesting that plant N status is not a good predictor of total ecosystem N retention. Because the largest ecosystem sinks for 15N tracer were below ground in forests, shrublands, and grasslands, we conclude that growth enhancement and potential for increased C storage in aboveground biomass from atmospheric N deposition is likely to be modest in these ecosystems. Total ecosystem 15N recovery decreased with N fertilization, with an apparent threshold fertilization rate of 46 kg N·ha−1·yr−1 above which most ecosystems showed net losses of applied 15N tracer in response to N fertilizer addition.

Place, publisher, year, edition, pages
John Wiley & Sons, Ltd , 2012. Vol. 93, no 8, p. 1816-1829
Keywords [en]
atmospheric nitrogen deposition, carbon storage, data synthesis, meta-analysis, nitrogen retention and loss, stable isotopes
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:polar:diva-8268DOI: 10.1890/11-1146.1OAI: oai:DiVA.org:polar-8268DiVA, id: diva2:1302607
Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-05

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