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Local vegetation trends in the sahel of Mali and Senegal using long time series FAPAR satellite products and field measurement (1982-2010)

Title data

Brandt, Martin ; Verger, Aleixandre ; Diouf, Abdoul Aziz ; Baret, Frédéric ; Samimi, Cyrus:
Local vegetation trends in the sahel of Mali and Senegal using long time series FAPAR satellite products and field measurement (1982-2010).
In: Remote Sensing. Vol. 6 (2014) Issue 3 . - pp. 2408-2434.
ISSN 2072-4292
DOI: https://doi.org/10.3390/rs6032408

Official URL: Volltext

Project information

Project financing: Bundesministerium für Bildung und Forschung

Abstract in another language

Local vegetation trends in the Sahel of Mali and Senegal from Geoland Version 1 (GEOV1) (5 km) and the third generation Global Inventory Modeling and Mapping Studies (GIMMS3g) (8 km) Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) time series are studied over 29 years. For validation and interpretation of observed greenness trends, two methods are applied: (1) a qualitative approach using in-depth knowledge of the study areas and (2) a quantitative approach by time series of biomass observations and rainfall data. Significant greening trends from 1982 to 2010 are consistently observed in both GEOV1 and GIMMS3g FAPAR datasets. Annual rainfall increased significantly during the observed time period, explaining large parts of FAPAR variations at a regional scale. Locally, GEOV1 data reveals a heterogeneous pattern of vegetation change, which is confirmed by long-term ground data and site visits. The spatial variability in the observed vegetation trends in the Sahel area are mainly caused by varying tree-and land-cover, which are controlled by human impact, soil and drought resilience. A large proportion of the positive trends are caused by the increment in leaf biomass of woody species that has almost doubled since the 1980s due to a tree cover regeneration after a dry-period. This confirms the re-greening of the Sahel, however, degradation is also present and sometimes obscured by greening. GEOV1 as compared to GIMMS3g made it possible to better characterize the spatial pattern of trends and identify the degraded areas in the study region.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Africa; Mali; Sahel; Senegal; Remote sensing; Environmental change; Time series; Climate Change; greening
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Climatology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Climatology > Professorship Climatology - Univ.-Prof. Dr. Cyrus Samimi
Profile Fields > Advanced Fields > African Studies
Profile Fields > Advanced Fields > Ecology and the Environmental Sciences
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions > Research Centres > Institute of African Studies - IAS
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
Date Deposited: 02 Dec 2014 13:13
Last Modified: 02 Dec 2014 13:13
URI: https://eref.uni-bayreuth.de/id/eprint/4413