气候变化领域集成服务门户(CCPortal): Exposure to cold temperature affects the spring phenology of Alaskan deciduous vegetation types

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DOI	10.1088/1748-9326/ab6502
	Exposure to cold temperature affects the spring phenology of Alaskan deciduous vegetation types
	Shi M.; Parazoo N.C.; Jeong S.-J.; Birch L.; Lawrence P.; Euskirchen E.S.; Miller C.E.
发表日期	2020
ISSN	17489318
卷号	15 期号:2
英文摘要	Temperature is a dominant factor driving arctic and boreal ecosystem phenology, including leaf budburst and gross primary production (GPP) onset in Alaskan spring. Previous studies hypothesized that both accumulated growing degree day (GDD) and cold temperature (chilling) exposure are important to leaf budburst. We test this hypothesis by combining both satellite and aircraft vegetation measurements with the Community Land Model Version 4.5 (CLM), in which the end of plant dormancy depends on thermal conditions (i.e. GDD). We study the sensitivity of GPP onset of different Alaskan deciduous vegetation types to a GDD model with chilling requirement (GC model) included. The default CLM simulations have a 1-12 d earlier day of year GPP onset over Alaska vegetated regions compared to satellite constrained estimates from the Polar Vegetation Photosynthesis and Respiration Model. Integrating a GC model into CLM shifts the phase and amplitude of GPP. During 2007-2016, mean GPP onset is postponed by 5 ± 7, 4 ± 8, and 1 ± 6 d over Alaskan northern tundra, shrub, and forest, respectively. The GC model has the greatest impact during warm springs, which is critical for predicting phenology response to future warming. Overall, spring GPP high bias is reduced by 10%. Thus, including chilling requirement in thermal forcing models improves northern high-latitude phenology, but leads to other impacts during the growing season which require further investigation. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	Alaskan deciduous vegetation; chilling requirement; community land model; GPP onset; leaf budburst
语种	英语
scopus关键词	Geothermal springs; Boreal ecosystems; Budburst; Chilling requirement; Community land models; GPP onset; Gross primary production; Growing degree-days; Vegetation measurement; Vegetation; aircraft; budburst; deciduous forest; dormancy; growing season; phenology; primary production; satellite data; sensitivity analysis; temperature effect; vegetation type; Alaska; United States
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/154106
作者单位	Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, United States; Joint Institute for Regional Earth System Science and Engineering, University of California at Los Angeles, Los Angeles, CA 90095, United States; Department of Environmental Planning, Graduate School of Environmental Studies, Seoul National University, Seoul, South Korea; Woods Hole Research Center, Falmouth, MA 02540, United States; National Center for Atmospheric Research, Boulder, CO 80305, United States; University of Alaska Fairbanks, Institute of Arctic Biology, Fairbanks, AK 99775, United States
推荐引用方式 GB/T 7714	Shi M.,Parazoo N.C.,Jeong S.-J.,et al. Exposure to cold temperature affects the spring phenology of Alaskan deciduous vegetation types[J],2020,15(2).
APA	Shi M..,Parazoo N.C..,Jeong S.-J..,Birch L..,Lawrence P..,...&Miller C.E..(2020).Exposure to cold temperature affects the spring phenology of Alaskan deciduous vegetation types.Environmental Research Letters,15(2).
MLA	Shi M.,et al."Exposure to cold temperature affects the spring phenology of Alaskan deciduous vegetation types".Environmental Research Letters 15.2(2020).