气候变化领域集成服务门户(CCPortal): Multi-year data-model evaluation reveals the importance of nutrient availability over climate in arctic ecosystem C dynamics

CCPortal

DOI	10.1088/1748-9326/ab865b
	Multi-year data-model evaluation reveals the importance of nutrient availability over climate in arctic ecosystem C dynamics
	López-Blanco E.; Jackowicz-Korczynski M.; Mastepanov M.; Skov K.; Westergaard-Nielsen A.; Williams M.; Christensen T.R.
发表日期	2020
ISSN	17489318
卷号	15 期号:9
英文摘要	Arctic tundra is a globally important store for carbon (C). However, there is a lack of reference sites characterising C exchange dynamics across annual cycles. Based on the Greenland Ecosystem Monitoring (GEM) programme, here we present 9-11 years of flux and ecosystem data across the period 2008-2018 from two wetland sites in Greenland: Zackenberg (74°N) and Kobbefjord (64°N). The Zackenberg fen was a strong C sink despite its higher latitude and shorter growing seasons compared to the Kobbefjord fen. On average the ecosystem in Zackenberg took up ∼-50 g C m-2 yr-1 (range of +21 to-90 g C m-2 yr-1), more than twice that of Kobbefjord (mean ∼-18 g C m-2 yr-1, and range of +41 to-41 g C m-2 yr-1). The larger net carbon sequestration in Zackenberg fen was associated with higher leaf nitrogen (71%), leaf area index (140%), and plant quality (i.e. C:N ratio; 36%). Additional evidence from in-situ measurements includes 3 times higher levels of dissolved organic carbon in soils and 5 times more available plant nutrients, including dissolved organic nitrogen (N) and nitrates, in Zackenberg. Simulations using the soil-plant-atmosphere ecosystem model showed that Zackenberg's stronger CO2 sink could be related to measured differences in plant nutrients, and their effects on photosynthesis and respiration. The model explained 69% of the variability of net ecosystem exchange of CO2, 80% for photosynthesis and 71% for respiration over 11 years at Zackenberg, similar to previous results at Kobbefjord (73%, 73%, and 50%, respectively, over 8 years). We conclude that growing season limitations of plant phenology on net C uptake have been more than counterbalanced by the increased leaf nutrient content at the Zackenberg site. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Arctic tundra; Ecosystem respiration; Greenland; Net ecosystem exchange; Nutrient availability; Photosynthesis
语种	英语
scopus关键词	Carbon dioxide; Climate models; Ecosystems; Forestry; Organic carbon; Photosynthesis; Plants (botany); Wetlands; Carbon sequestration; Dissolved organic carbon; Dissolved organic nitrogen; Ecosystem monitoring; Exchange dynamics; In-situ measurement; Net ecosystem exchange; Nutrient availability; Nutrients; air-water interaction; carbon cycle; climate change; Lotka-Volterra model; model; nutrient availability; Arctic Ocean
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153795
作者单位	Department of Bioscience, Arctic Research Center, Aarhus University, Roskilde, Denmark; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Oulanka Research Station, Oulu University, Kuusamo, Finland; Department of Geosciences and Natural Resource Management, Center for Permafrost (CENPERM), University of Copenhagen, Copenhagen, Denmark; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom
推荐引用方式 GB/T 7714	López-Blanco E.,Jackowicz-Korczynski M.,Mastepanov M.,et al. Multi-year data-model evaluation reveals the importance of nutrient availability over climate in arctic ecosystem C dynamics[J],2020,15(9).
APA	López-Blanco E..,Jackowicz-Korczynski M..,Mastepanov M..,Skov K..,Westergaard-Nielsen A..,...&Christensen T.R..(2020).Multi-year data-model evaluation reveals the importance of nutrient availability over climate in arctic ecosystem C dynamics.Environmental Research Letters,15(9).
MLA	López-Blanco E.,et al."Multi-year data-model evaluation reveals the importance of nutrient availability over climate in arctic ecosystem C dynamics".Environmental Research Letters 15.9(2020).