气候变化领域集成服务门户(CCPortal): A narrow window of summer temperatures associated with shrub growth in Arctic Alaska

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DOI	10.1088/1748-9326/ab897f
	A narrow window of summer temperatures associated with shrub growth in Arctic Alaska
	Andreu-Hayles L.; Gaglioti B.V.; Berner L.T.; Levesque M.; Anchukaitis K.J.; Goetz S.J.; D'Arrigo R.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Warming in recent decades has triggered shrub expansion in Arctic and alpine tundra, which is transforming these temperature-limited ecosystems and altering carbon and nutrient cycles, fire regimes, permafrost stability, land-surface climate-feedbacks, and wildlife habitat. Where and when Arctic shrub expansion happens in the future will depend in part on how different shrub communities respond to warming air temperatures. Here, we analyze a shrub ring-width network of 18 sites consisting of Salix spp. and Alnus viridis growing across the North Slope of Alaska (68-71°N; 164-149°W) to assess shrub temperature sensitivity and compare radial growth patterns with satellite NDVI (normalized difference vegetation index) data since 1982. Regardless of site conditions and taxa, all shrubs shared a common year-to-year growth variability and had a positive response to daily maximum air temperatures (Tmax) from ca. May 31 (i.e. Tmax ∼6 °C) to early July (i.e. Tmax ∼12 °C), two-thirds of which were significant correlations. Thus, the month of June had the highest shrub growth-temperature sensitivity. This period coincides with the seasonal increase in temperature and phenological green up on the North Slope indicated by both field observations and the seasonal cycle of NDVI (a proxy of photosynthetic activity). Nearly all of the sampled shrubs (98%) initiated their growth after 1960, with 74% initiated since 1980. This post-1980 shrub-recruitment pulse coincided with ∼2 °C warmer June temperatures compared to prior periods, as well as with positive trends in shrub basal area increments and peak summer NDVI. Significant correlations between shrub growth and peak summer NDVI indicate these radial growth patterns in shrubs reflect tundra productivity at a broader scale and that tundra vegetation on the North Slope of Alaska underwent a greening trend between 1980 and 2012. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Alaska; NDVI; remote sensing; shrubs; tree rings; tundra; warming
语种	英语
scopus关键词	Atmospheric temperature; Expansion; Vegetation; Basal area increment; Field observations; Normalized difference vegetation index; North Slope of Alaska; Photosynthetic activity; Summer temperature; Temperature limiteds; Temperature sensitivity; Landforms; air temperature; carbon cycle; correlation; growth rate; plant community; shrub; summer; temperature effect; tundra; Alaska; United States; Alnus viridis; Salix
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/153593
作者单位	Tree-Ring Laboratory, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Water and Environmental Research Center, Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK, United States; School of Informatics Computing and Cyber Systems, Northern Arizona UniversityAZ, United States; Institute of Terrestrial Ecosystems, Eth, Zurich, Switzerland; Laboratory of Tree-Ring Research and School of Geography and Development, University of Arizona, Tucson, AZ, United States
推荐引用方式 GB/T 7714	Andreu-Hayles L.,Gaglioti B.V.,Berner L.T.,et al. A narrow window of summer temperatures associated with shrub growth in Arctic Alaska[J],2020,15(10).
APA	Andreu-Hayles L..,Gaglioti B.V..,Berner L.T..,Levesque M..,Anchukaitis K.J..,...&D'Arrigo R..(2020).A narrow window of summer temperatures associated with shrub growth in Arctic Alaska.Environmental Research Letters,15(10).
MLA	Andreu-Hayles L.,et al."A narrow window of summer temperatures associated with shrub growth in Arctic Alaska".Environmental Research Letters 15.10(2020).