“…All study areas cited in this paper with a reported re-greening trend, such as Senegal (e.g. Herrmann and Tappan, 2013;Brandt et al, 2014aBrandt et al, , b, 2015Herrmann and Sop, 2016), Mali and Burkina Faso (Hiernaux et al, 2009a, b;Dardel et al, 2014a, b;Rasmussen et al, 2014;Brandt et al, 2016b), and Niger (Hiernaux et al, 2009a, b;Boubacar, 2016), are situated on the sandy soils of the Quaternary dune systems. Krings (1980).…”