1. Ecology, Ecological Restoration and Landscape, Faculty of Agronomic Sciences, Université de Lubumbashi, Lubumbashi 1825, Democratic Republic of the Congo
2. Water-Soil-Plant Unit, TERRA Gembloux Agro-Bio Tech, University of Liege, 5030 Gembloux, Belgium
3. Plant Ecology and Biogeochemistry, Université Libre de Bruxelles, 1050 Bruxelles, Belgium