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DOI	10.1088/1748-9326/ab9c4c
	Do recent NDVI trends demonstrate boreal forest decline in Alaska?
	Fiore N.M.; Goulden M.L.; Czimczik C.I.; Pedron S.A.; Tayo M.A.
发表日期	2020
ISSN	17489318
卷号	15 期号:9
英文摘要	Remote sensing analyses of boreal forest regions have found widespread decreasing or increasing trends in normalized difference vegetation index (NDVI). Initially, these trends were attributed to climate change induced shifts in primary productivity. It is emerging, however, that fire disturbance and subsequent succession also strongly impact the optical properties of boreal forests. Here we use NDVI time series data from Landsat (1999-2018) paired with surveys of 102 forest stands with known recent fire history to investigate the relationship between NDVI and forest structure during succession. We found that NDVI varies systematically with stand age as a result of successional changes in forest structure and composition and that the proportion of deciduous (broad-leaved) trees in the upper canopy is a better predictor of NDVI than leaf area index. Recent fire disturbance led to strong NDVI decreases and early post-fire recovery of herbaceous and deciduous vegetation to strong NDVI increases. The mid-succession transition from deciduous to evergreen (needle-leaved) stands led to weak NDVI decreases, while mid-to-late succession thinning of evergreen canopies led to weak NDVI increases. Thus, both increasing and decreasing NDVI stands occur naturally across the landscape, and do not necessarily reflect a large-scale shift in boreal forest productivity. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	fire recovery; forest fire; NASA ABoVE; remote sensing; succession
语种	英语
scopus关键词	Climate change; Fires; Optical properties; Remote sensing; Vegetation; Boreal forests; Fire disturbance; Forest structure; Leaf Area Index; NDVI time series; Normalized difference vegetation index; Primary productivity; Remote sensing analysis; Forestry; boreal forest; forest ecosystem; NDVI; population decline; satellite altimetry; trend analysis; 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/153753
作者单位	Department of Earth System Science, University of California, Irvine, CA 92697-3100, United States
推荐引用方式 GB/T 7714	Fiore N.M.,Goulden M.L.,Czimczik C.I.,et al. Do recent NDVI trends demonstrate boreal forest decline in Alaska?[J],2020,15(9).
APA	Fiore N.M.,Goulden M.L.,Czimczik C.I.,Pedron S.A.,&Tayo M.A..(2020).Do recent NDVI trends demonstrate boreal forest decline in Alaska?.Environmental Research Letters,15(9).
MLA	Fiore N.M.,et al."Do recent NDVI trends demonstrate boreal forest decline in Alaska?".Environmental Research Letters 15.9(2020).