NDLI: Woody Vegetation Die off and Regeneration in Response to Rainfall Variability in the West African Sahel

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Woody Vegetation Die off and Regeneration in Response to Rainfall Variability in the West African Sahel

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Woody Vegetation Die off and Regeneration in Response to Rainfall Variability in the West African Sahel

Content Provider	MDPI
Author	Brandt, Martin Tappan, Gray Diouf, Abdoul Beye, Gora Mbow, Cheikh Fensholt, Rasmus
Abstract	The greening in the Senegalese Sahel has been linked to an increase in net primary productivity, with significant long-term trends being closely related to the woody strata. This study investigates woody plant growth and mortality within greening areas in the pastoral areas of Senegal, and how these dynamics are linked to species diversity, climate, soil and human management. We analyse woody cover dynamics by means of multi-temporal and multi-scale Earth Observation, satellite based rainfall and in situ data sets covering the period 1994 to 2015. We find that favourable conditions (forest reserves, low human population density, sufficient rainfall) led to a rapid growth of Combretaceae and Balanites aegyptiaca between 2000 and 2013 with an average increase of 4% woody cover. However, the increasing dominance and low drought resistance of drought prone species bears the risk of substantial woody cover losses following drought years. This was observed in 2014–2015, with a die off of Guiera senegalensis in most places of the study area. We show that woody cover and woody cover trends are closely related to mean annual rainfall, but no clear relationship with rainfall trends was found over the entire study period. The observed spatial and temporal variation contrasts with the simplified labels of “greening” or “degradation”. While in principal a low woody plant diversity negatively impacts regional resilience, the Sahelian system is showing signs of resilience at decadal time scales through widespread increases in woody cover and high regeneration rates after periodic droughts. We have reaffirmed that the woody cover in Sahel responds to its inherent climatic variability and does not follow a linear trend.
File Size	17996800
File Format	PDF
e-ISSN	20724292
DOI	10.3390/rs9010039
Journal	Remote Sensing
Issue Number	1
Volume Number	9
Language	English
Publisher Date	2017-01-05
Access Restriction	Open
Subject Keyword	Combretaceae drought environmental monitoring Ferlo high resolution imagery resilience Sahel Senegal shrub encroachment tree mortality
Content Type	Text
Resource Type	Article

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