气候变化领域集成服务门户(CCPortal): Extreme event impacts on CO2 fluxes across a range of high latitude, shrub-dominated ecosystems

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DOI	10.1088/1748-9326/abb0b1
	Extreme event impacts on CO2 fluxes across a range of high latitude, shrub-dominated ecosystems
	Treharne R.; Bjerke J.W.; Tømmervik H.; Phoenix G.K.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	The Arctic is experiencing an increased frequency of extreme events which can cause landscape-scale vegetation damage. Extreme event-driven damage is an important driver of the decline in vegetation productivity (termed ‘Arctic browning’) which has become an increasingly important component of pan-Arctic vegetation change in recent years. A limited number of studies have demonstrated that event-driven damage can have major impacts on ecosystem CO2 balance, reducing ecosystem carbon sink strength. However, although there are many different extreme events that cause Arctic browning and different ecosystem types that are affected, there is no understanding of how impacts on CO2 fluxes might vary between these, or of whether commonalities in response exist that would simplify incorporation of extreme event-driven Arctic browning into models. To address this, the impacts of different extreme events (frost-drought, extreme winter warming, ground icing and a herbivore insect outbreak) on growing season CO2 fluxes of Net Ecosystem Exchange (NEE), Gross Primary Productivity (GPP) and ecosystem respiration (Reco) were assessed at five sites from the boreal to High Arctic (64◦N-79◦N) in mainland Norway and Svalbard. Event-driven browning had consistent, major impacts across contrasting sites and event drivers, causing site-level reductions of up to 81% of NEE, 51% of GPP and 37% of Reco. Furthermore, at sites where plot-level NDVI (greenness) data were obtained, strong linear relationships between NDVI and NEE were identified, indicating clear potential for impacts of browning on CO2 balance to be consistently, predictably related to loss of greenness across contrasting types of events and heathland ecosystems. This represents the first attempt to compare the consequences of browning driven by different extreme events on ecosystem CO2 balance, and provides an important step towards a better understanding of how ecosystem CO2 balance will respond to continuing climate change at high latitudes. © 2020 The Author(s).
英文关键词	Arctic; Arctic browning; Climate change; Dwarf shrub; Extreme events; Snow cover; Winter
语种	英语
scopus关键词	Carbon dioxide; Climate change; Vegetation; Ecosystem carbons; Ecosystem respiration; Gross primary productivity; Linear relationships; Net ecosystem exchange; Vegetation change; Vegetation damage; Vegetation productivity; Ecosystems; carbon dioxide; carbon sink; climate change; extreme event; growing season; heathland; herbivore; NDVI; Arctic; Arctic; Norway; Svalbard; Svalbard and Jan Mayen; Hexapoda
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/153623
作者单位	Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, United Kingdom; Norwegian Institute for Nature Research, High North Centre for Climate and the Environment, Tromsø, NO-9296, Norway
推荐引用方式 GB/T 7714	Treharne R.,Bjerke J.W.,Tømmervik H.,et al. Extreme event impacts on CO2 fluxes across a range of high latitude, shrub-dominated ecosystems[J],2020,15(10).
APA	Treharne R.,Bjerke J.W.,Tømmervik H.,&Phoenix G.K..(2020).Extreme event impacts on CO2 fluxes across a range of high latitude, shrub-dominated ecosystems.Environmental Research Letters,15(10).
MLA	Treharne R.,et al."Extreme event impacts on CO2 fluxes across a range of high latitude, shrub-dominated ecosystems".Environmental Research Letters 15.10(2020).