气候变化领域集成服务门户(CCPortal): Rapid carbon accumulation in a peatland following Late Holocene tephra deposition; New Zealand

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DOI	10.1016/j.quascirev.2020.106505
	Rapid carbon accumulation in a peatland following Late Holocene tephra deposition; New Zealand
	Ratcliffe J.L.; Lowe D.J.; Schipper L.A.; Gehrels M.J.; French A.D.; Campbell D.I.
发表日期	2020
ISSN	0277-3791
卷号	246
英文摘要	Contemporary measurements of carbon (C) accumulation rates in peatlands around the world often show the C sink to be stronger on average than at times in the past. Alteration of global nutrient cycles could be contributing to elevated carbon accumulation in the present day. Here we examine the effect of volcanic inputs of nutrients on peatland C accumulation in Moanatuatua Bog, New Zealand, by examining a high-resolution Late Holocene C accumulation record during which powerful volcanic eruptions occurred, depositing two visible rhyolitic tephra layers (Taupo, 232 ± 10 CE; Kaharoa, 1314 ± 12 CE). Carbon accumulation rates since c. 50 CE, well before any human presence, increased from a background rate of 23 g C m−2 yr−1 up to 110 g C m−2 yr−1 following the deposition of the Taupo Tephra, and 84 g C m−2 yr−1 following the deposition of the Kaharoa Tephra. Smaller but nevertheless marked increases in C accumulation additionally occurred in association with the deposition of three andesitic-dacitic cryptotephras (each ≤ ∼1 mm thick) of the Tufa Trig Formation between the Taupo and Kaharoa events. These five periods of elevated C uptake, especially those associated with the relatively thick Taupo and Kaharoa tephras, were accompanied by shifts in nutrient stoichiometry, indicating that there was greater availability of phosphorus (P) relative to nitrogen (N) and C during the period of high C uptake. Such P was almost certainly derived from volcanic sources, with P being present in the volcanic glass at Moanatuatua, and many of the eruptions described being associated with the local deposition of the P rich mineral apatite. We found peatland C accumulation to be tightly coupled to N and P accumulation, suggesting nutrient inputs exert a strong control on rates of peat accumulation. Nutrient stoichiometry indicated a strong ability to recover P within the ecosystem, with C:P ratios being higher than most other peatlands in the literature. We conclude that nutrient inputs, deriving from volcanic eruptions, have been very important for C accumulation rates in the past. Therefore, the elevated nutrient inputs occurring in the present day could offer a more plausible explanation, as opposed to a climatic component, for observed high contemporary C accumulation in New Zealand peatlands. © 2020 Elsevier Ltd
英文关键词	Elemental-accumulation; Geochemistry; Nutrients; Tephrochronology; Volcanism
语种	英语
scopus关键词	Carbon; Deposition; Phosphate minerals; Stoichiometry; Volcanoes; Wetlands; Accumulation rates; Carbon accumulation; Global nutrient cycles; High resolution; Local deposition; Peat accumulation; Tightly-coupled; Volcanic eruptions; Nutrients; carbon sequestration; Holocene; peatland; phosphorus; rhyolite; stoichiometry; tephra; volcanic eruption; volcanic glass; New Zealand; North Island; Taupo; Waikato
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151314
作者单位	School of Science and Environmental Research Institute, University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Environment and Geography, University of York, York, YO105DD, United Kingdom; School of Geography, The University of Plymouth, Drake Circus, England, Plymouth, PL4 8AA, United Kingdom
推荐引用方式 GB/T 7714	Ratcliffe J.L.,Lowe D.J.,Schipper L.A.,et al. Rapid carbon accumulation in a peatland following Late Holocene tephra deposition; New Zealand[J],2020,246.
APA	Ratcliffe J.L.,Lowe D.J.,Schipper L.A.,Gehrels M.J.,French A.D.,&Campbell D.I..(2020).Rapid carbon accumulation in a peatland following Late Holocene tephra deposition; New Zealand.Quaternary Science Reviews,246.
MLA	Ratcliffe J.L.,et al."Rapid carbon accumulation in a peatland following Late Holocene tephra deposition; New Zealand".Quaternary Science Reviews 246(2020).