Spatiotemporal Response of Vegetation to Rainfall and Air Temperature Fluctuations in the Sahel: Case Study in the Forest Reserve of Fina, Mali

Sanogo, K and Zemadim, B and Sanogo, S and Aishetu, A and Ba, A (2021) Spatiotemporal Response of Vegetation to Rainfall and Air Temperature Fluctuations in the Sahel: Case Study in the Forest Reserve of Fina, Mali. Sustainability (TSI), 13 (11). pp. 1-17. ISSN 2071-1050

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Abstract

Forests constitute a key component of the Earth system but the sustainability of the forest reserves in the semi-arid zone is a real concern since its vegetation is very sensitive to the climate fluctuation. The understanding of the mechanisms for the vegetation–climate interaction is poorly studied in the context of African Sahel. In this study, the characteristics of the vegetation response to the fluctuations of precipitation and temperature is determined for the forest reserve of Fina. Rainfall estimates, air temperature and NDVI were re-gridded to a same spatial resolution and standardized with respect to their respective long-term mean. Lag-correlations analysis was used to estimate lag times between changes of climate variables and vegetation response at both seasonal and interannual bases. Results show increasing tendency of NDVI started from the 1990s coinciding the recovery of the rainfall from the 1980s drought, and the obtained correlation (r = 0.66) is statistically significant (p value < 0.01). The strongest responses of vegetation to rainfall and temperature fluctuations were found after 30 and 15 days, respectively. Moreover, at a shorter time lag (e.g., 15 days), more pronounced vegetation responses to both rainfall and temperature were found in agriculturally dominated land while at a longer time lag (e.g., 30 days), a stronger response was observed in Bare-dominated land. The vegetation response to the climate fluctuation is modulated by the land-use/cover dynamics.

Item Type:	Article
Divisions:	Research Program : West & Central Africa
CRP:	CGIAR Research Program on Water, Land and Ecosystems (WLE)
Uncontrolled Keywords:	NDVI, Rainfall, Air Temperature, Vegetation response, Fina forest reserve, Mali
Subjects:	Others > Rainfed Agriculture
Depositing User:	Mr Arun S
Date Deposited:	16 Jul 2021 06:40
Last Modified:	16 Jul 2021 06:40
URI:	http://oar.icrisat.org/id/eprint/11854
Official URL:	https://doi.org/10.3390/su13116250
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	Authors thank the International Science Programme (ISP/IPPS) through the Laboratoire d’Optique de Spectroscopie et des Sciences de l’Atmosphere (LOSSA) at the Faculty of Sciences and Technology for the use of their data and facilities. This work was supported by the CGIAR program onWater, Land and Ecosystem (WLE) and the Africa Research in Sustainable Intensification for the Next Generation (Africa RISING) project in Mali. The authors are very grateful to the financial support provided by the International Water Management Institute (IWMI) and the United States Agency for Development (USAID) through the International Institute of Tropical Agriculture (IITA).
Links:	Google Scholar

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