DOI: 10.1111/gcb.14310
Scopus记录号: 2-s2.0-85051506918
论文题名: Large-scale prerain vegetation green-up across Africa
作者: Adole T. ; Dash J. ; Atkinson P.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 9 起始页码: 4054
结束页码: 4068
语种: 英语
英文关键词: Africa
; climate change
; ecosystem models
; rainfall
; vegetation phenology
英文摘要: Information on the response of vegetation to different environmental drivers, including rainfall, forms a critical input to ecosystem models. Currently, such models are run based on parameters that, in some cases, are either assumed or lack supporting evidence (e.g., that vegetation growth across Africa is rainfall-driven). A limited number of studies have reported that the onset of rain across Africa does not fully explain the onset of vegetation growth, for example, drawing on the observation of prerain flush effects in some parts of Africa. The spatial extent of this prerain green-up effect, however, remains unknown, leaving a large gap in our understanding that may bias ecosystem modelling. This paper provides the most comprehensive spatial assessment to-date of the magnitude and frequency of the different patterns of phenology response to rainfall across Africa and for different vegetation types. To define the relations between phenology and rainfall, we investigated the spatial variation in the difference, in number of days, between the start of rainy season (SRS) and start of vegetation growing season (SOS); and between the end of rainy season (ERS) and end of vegetation growing season (EOS). We reveal a much more extensive spread of prerain green-up over Africa than previously reported, with prerain green-up being the norm rather than the exception. We also show the relative sparsity of postrain green-up, confined largely to the Sudano-Sahel region. While the prerain green-up phenomenon is well documented, its large spatial extent was not anticipated. Our results, thus, contrast with the widely held view that rainfall drives the onset and end of the vegetation growing season across Africa. Our findings point to a much more nuanced role of rainfall in Africa's vegetation growth cycle than previously thought, specifically as one of a set of several drivers, with important implications for ecosystem modelling. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110254
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Global Environmental Change and Earth Observation Research Group, Geography and Environment, University of Southampton, Southampton, United Kingdom; Faculty of Science and Technology, Lancaster University, Lancaster, United Kingdom; School of Geography, Archaeology and Palaeoecology, Queen's University Belfast, Belfast, United Kingdom
Recommended Citation:
Adole T.,Dash J.,Atkinson P.M.. Large-scale prerain vegetation green-up across Africa[J]. Global Change Biology,2018-01-01,24(9)