气候变化领域集成服务门户(CCPortal): The Grass Is Not Always Greener on the Other Side: Seasonal Reversal of Vegetation Greenness in Aspect-Driven Semiarid Ecosystems

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DOI	10.1029/2020GL088918
	The Grass Is Not Always Greener on the Other Side: Seasonal Reversal of Vegetation Greenness in Aspect-Driven Semiarid Ecosystems
	Kumari N.; Saco P.M.; Rodriguez J.F.; Johnstone S.A.; Srivastava A.; Chun K.P.; Yetemen O.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	Our current understanding of semiarid ecosystems is that they tend to display higher vegetation greenness on polar-facing slopes (PFS) than on equatorial-facing slopes (EFS). However, recent studies have argued that higher vegetation greenness can occur on EFS during part of the year. To assess whether this seasonal reversal of aspect-driven vegetation is a common occurrence, we conducted a global-scale analysis of vegetation greenness on a monthly time scale over an 18-year period (2000–2017). We examined the influence of climate seasonality on the normalized difference vegetation index (NDVI) values of PFS and EFS at 60 different catchments with aspect-controlled vegetation located across all continents except Antarctica. Our results show that an overwhelming majority of sites (70%) display seasonal reversal, associated with transitions from water-limited to energy-limited conditions during wet winters. These findings highlight the need to consider seasonal variations of aspect-driven vegetation patterns in ecohydrology, geomorphology, and Earth system models. ©2020. The Authors.
英文关键词	Catchments; Ecosystems; Facings; Climate seasonality; Earth system model; Monthly time scale; Normalized difference vegetation index; Seasonal variation; Semi-arid ecosystems; Vegetation greenness; Vegetation pattern; Vegetation; catchment; ecohydrology; geomorphology; grass; NDVI; seasonality; semiarid region; trend analysis; vegetation dynamics; winter; Antarctica
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170055
作者单位	Discipline of Civil, Surveying and Environmental Engineering, The University of Newcastle, Callaghan, NSW, Australia; U.S. Geological Survey, Geosciences and Environmental Change Science Center, Denver, CO, United States; Department of Geography, Hong Kong Baptist University, Hong Kong, China; Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey
推荐引用方式 GB/T 7714	Kumari N.,Saco P.M.,Rodriguez J.F.,et al. The Grass Is Not Always Greener on the Other Side: Seasonal Reversal of Vegetation Greenness in Aspect-Driven Semiarid Ecosystems[J],2020,47(15).
APA	Kumari N..,Saco P.M..,Rodriguez J.F..,Johnstone S.A..,Srivastava A..,...&Yetemen O..(2020).The Grass Is Not Always Greener on the Other Side: Seasonal Reversal of Vegetation Greenness in Aspect-Driven Semiarid Ecosystems.Geophysical Research Letters,47(15).
MLA	Kumari N.,et al."The Grass Is Not Always Greener on the Other Side: Seasonal Reversal of Vegetation Greenness in Aspect-Driven Semiarid Ecosystems".Geophysical Research Letters 47.15(2020).