Icelandic grasslands as long-term C sinks under elevated organic N inputs
| Autor: | Niki I. W. Leblans, Rien Aerts, Ivan A. Janssens, Borgthor Magnusson, Bjarni D. Sigurdsson, Sara Vicca |
|---|---|
| Přispěvatelé: | Systems Ecology, Vrije Universiteit Amsterdam |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
N inputs chemistry.chemical_element 01 natural sciences Sink (geography) Long-term carbon storage Soil development SDG 13 - Climate Action Environmental Chemistry Ecosystem SDG 14 - Life Below Water Biology 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology 2. Zero hunger Hydrology Topsoil geography Surtsey geography.geographical_feature_category Physics 04 agricultural and veterinary sciences 15. Life on land Nitrogen Chemistry chemistry 13. Climate action Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Soil horizon Environmental science Terrestrial ecosystem Terrestrial C sink Volcanic ash |
| Zdroj: | Biogeochemistry, 134(3), 279-299. Springer Netherlands Leblans, N I W, Sigurdsson, B D, Aerts, R, Vicca, S, Magnússon, B & Janssens, I A 2017, ' Icelandic grasslands as long-term C sinks under elevated organic N inputs ', Biogeochemistry, vol. 134, no. 3, pp. 279-299 . https://doi.org/10.1007/s10533-017-0362-5 Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Recercat. Dipósit de la Recerca de Catalunya instname Biogeochemistry |
| ISSN: | 0168-2563 |
| DOI: | 10.1007/s10533-017-0362-5 |
| Popis: | About 10% of the anthropogenic CO2 emissions have been absorbed by northern terrestrial ecosystems during the past decades. It has been hypothesized that part of this increasing carbon (C) sink is caused by the alleviation of nitrogen (N) limitation by increasing anthropogenic N inputs. However, little is known about this N-dependent C sink. Here, we studied the effect of chronic seabird-derived N inputs (47–67 kg N ha−1 year−1) on the net soil organic C (SOC) storage rate of unmanaged Icelandic grasslands on the volcanic Vestmannaeyjar archipelago by using a stock change approach in combination with soil dating. We studied both early developmental (young) soils that had been receiving increased N inputs over a decadal timescale since an eruption in 1963, and well-developed soils, that had been receiving N inputs over a millennial timescale. For the latter, however, the effects on both decadal (topsoil; 40 years) and millennial (total soil profile; 1600 years) SOC storage could be studied, as the age of topsoil and the total soil profile could be determined from volcanic ash layers deposited in 1973 and 395 AD. We found that enhanced N availability—either from accumulation over time, or seabird derived—increased the net SOC storage rate. Under low N inputs, early developmental soils were weak decadal C sinks (0.018 ton SOC ha−1 year−1), but this increased quickly under ca. 30 years of elevated N inputs to 0.29 ton SOC ha−1 year−1, thereby equalling the decadal SOC storage rate of the unfertilized well-developed soils. Furthermore, for the well-developed soils, chronically elevated N inputs not only stimulated the decadal SOC storage rate in the topsoil, but also the total millennial SOC storage was consistently higher. Hence, our study suggests that Icelandic grasslands, if not disturbed, can remain C sinks for many centuries under current climatic conditions and that chronically elevated N inputs can induce a permanent strengthening of this sink. |
| Databáze: | OpenAIRE |
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