气候变化领域集成服务门户(CCPortal): Hot moments in ecosystem fluxes: High GPP anomalies exert outsized influence on the carbon cycle and are differentially driven by moisture availability across biomes

CCPortal

DOI	10.1088/1748-9326/ab7b97
	Hot moments in ecosystem fluxes: High GPP anomalies exert outsized influence on the carbon cycle and are differentially driven by moisture availability across biomes
	Kannenberg S.A.; Bowling D.R.; Anderegg W.R.L.
发表日期	2020
ISSN	17489318
卷号	15 期号:5
英文摘要	The 'hot spot-hot moment' concept is a long-standing and popular framework often invoked to explain spatially or temporally variable rates of biogeochemical cycling. However, this concept has been rarely extended to ecosystem fluxes such as gross primary productivity (GPP), in part due to the lack of a quantitative definition of hot moments that can be applied to large flux datasets. Here, we develop a general statistical framework for quantifying hot moments in GPP and identify their spatial patterns and climatic drivers. Using 308 site-years of eddy covariance data from the FLUXNET2015 dataset spanning 32 U.S. sites, we found hot moments in GPP to comprise a disproportionate percentage of annual carbon (C) uptake relative to the frequency of their occurrence. For example, at five sites over 12% of annual C uptake occurred during the ∼2% most extreme half-hourly or hourly observations of GPP. Hot moments were most quantitatively important for the C cycle in short-stature, arid ecosystem such as grasslands, woody savannas, and open shrublands, where these positive anomalies in GPP were caused by increases in moisture availability. In contrast, hot moments were less important for annual C uptake in more mesic ecosystems, where their occurrence was largely determined by high temperature and light availability. Our results point to a need to consider how short-term spikes in environmental conditions exert an outsized influence on annual GPP, and how future shifts in these conditions could impact the terrestrial C cycle. © 2020 The Author(s). Published by IOP Publishing Ltd.
语种	英语
scopus关键词	Carbon; Large dataset; Moisture; Biogeochemical cycling; Eddy covariance data; Environmental conditions; Gross primary productivity; High temperature; Light availability; Quantitative definition; Statistical framework; Ecosystems; biogeochemical cycle; biome; carbon cycle; data set; ecosystem dynamics; eddy covariance; environmental conditions; flux measurement; moisture; primary production
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/154032
作者单位	School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, United States
推荐引用方式 GB/T 7714	Kannenberg S.A.,Bowling D.R.,Anderegg W.R.L.. Hot moments in ecosystem fluxes: High GPP anomalies exert outsized influence on the carbon cycle and are differentially driven by moisture availability across biomes[J],2020,15(5).
APA	Kannenberg S.A.,Bowling D.R.,&Anderegg W.R.L..(2020).Hot moments in ecosystem fluxes: High GPP anomalies exert outsized influence on the carbon cycle and are differentially driven by moisture availability across biomes.Environmental Research Letters,15(5).
MLA	Kannenberg S.A.,et al."Hot moments in ecosystem fluxes: High GPP anomalies exert outsized influence on the carbon cycle and are differentially driven by moisture availability across biomes".Environmental Research Letters 15.5(2020).