DOI: 10.1007/s10533-017-0362-5
Scopus记录号: 2-s2.0-85026911884
论文题名: Icelandic grasslands as long-term C sinks under elevated organic N inputs
作者: Leblans N.I.W. ; Sigurdsson B.D. ; Aerts R. ; Vicca S. ; Magnússon B. ; Janssens I.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 3 起始页码: 279
结束页码: 299
语种: 英语
英文关键词: Long-term carbon storage
; N inputs
; Soil development
; Surtsey
; Terrestrial C sink
Scopus关键词: anthropogenic effect
; archipelago
; carbon sink
; ecosystem dynamics
; grassland
; long-term change
; nutrient availability
; organic nitrogen
; pedogenesis
; seabird
; soil profile
; terrestrial ecosystem
; topsoil
; volcanic ash
; Iceland
; Surtsey
; Vestmannaeyjar
英文摘要: 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. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83250
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Biology, University of Antwerp, Universiteitsplein 1, Wilrijk, Belgium; Faculty of Environmental Sciences, Agricultural University of Iceland, Hvanneyri, 311, Borgarnes, Iceland; Department of Systems Ecology, Vrije Universiteit, De Boelelaan 1087, Amsterdam, Netherlands; Icelandic Institute of Natural History, Urriðaholtsstræti 6–8, P.O. Box 125, Garðabær, Iceland
Recommended Citation:
Leblans N.I.W.,Sigurdsson B.D.,Aerts R.,et al. Icelandic grasslands as long-term C sinks under elevated organic N inputs[J]. Biogeochemistry,2017-01-01,134(3)