DOI: 10.1111/gcb.12807
论文题名: Ground-and satellite-based evidence of the biophysical mechanisms behind the greening Sahel
作者: Brandt M. ; Mbow C. ; Diouf A.A. ; Verger A. ; Samimi C. ; Fensholt R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 4 起始页码: 1610
结束页码: 1620
语种: 英语
英文关键词: Biodiversity
; Biomass monitoring
; Degradation
; Greening
; Sahel
; Vegetation change
Scopus关键词: biodiversity
; biomass
; degradation
; ground-based measurement
; monitoring
; rainfall
; remote sensing
; satellite data
; vegetation cover
; Sahel [Sub-Saharan Africa]
; Senegal
; rain
; biodiversity
; biomass
; biophysics
; climate change
; ecosystem
; environmental monitoring
; growth, development and aging
; plant development
; plant leaf
; remote sensing
; season
; Senegal
; space flight
; Biodiversity
; Biomass
; Biophysical Phenomena
; Climate Change
; Ecosystem
; Environmental Monitoring
; Plant Development
; Plant Leaves
; Rain
; Remote Sensing Technology
; Seasons
; Senegal
; Spacecraft
英文摘要: After a dry period with prolonged droughts in the 1970s and 1980s, recent scientific outcome suggests that the decades of abnormally dry conditions in the Sahel have been reversed by positive anomalies in rainfall. Various remote sensing studies observed a positive trend in vegetation greenness over the last decades which is known as the re-greening of the Sahel. However, little investment has been made in including long-term ground-based data collections to evaluate and better understand the biophysical mechanisms behind these findings. Thus, deductions on a possible increment in biomass remain speculative. Our aim is to bridge these gaps and give specifics on the biophysical background factors of the re-greening Sahel. Therefore, a trend analysis was applied on long time series (1987-2013) of satellite-based vegetation and rainfall data, as well as on ground-observations of leaf biomass of woody species, herb biomass, and woody species abundance in different ecosystems located in the Sahel zone of Senegal. We found that the positive trend observed in satellite vegetation time series (+36%) is caused by an increment of in situ measured biomass (+34%), which is highly controlled by precipitation (+40%). Whereas herb biomass shows large inter-annual fluctuations rather than a clear trend, leaf biomass of woody species has doubled within 27 years (+103%). This increase in woody biomass did not reflect on biodiversity with 11 of 16 woody species declining in abundance over the period. We conclude that the observed greening in the Senegalese Sahel is primarily related to an increasing tree cover that caused satellite-driven vegetation indices to increase with rainfall reversal. Copyright © 2015 John Wiley & Sons Ltd214 April 2015 10.1111/gcb.12807 Primary Research Article Primary Research Articles © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61706
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute of Geography, University of Bayreuth, Bayreuth, Germany; Science Domain 6, ICRAF (World Agroforestry Center), Nairobi, Kenya; Institut des Sciences de l'Environnement, Université Cheikh Anta Diop, Dakar, BP 5005, Senegal; Centre de Suivi Ecologique, Dakar-Fann, Senegal; Campus Arlon Environnement, Université de Liege, Liege, Belgium; Global Ecology Unit, CREAF, Cerdanyola del Vallès, Catalonia, Spain; UMR 1114, INRA-EMMAH, Site Agroparc, Avignon, France; BAYCEER, University of Bayreuth, Bayreuth, Germany; Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
Recommended Citation:
Brandt M.,Mbow C.,Diouf A.A.,et al. Ground-and satellite-based evidence of the biophysical mechanisms behind the greening Sahel[J]. Global Change Biology,2015-01-01,21(4)