Assessing tree effect on total soil carbon in agroforestry parklands systems along a rainfall gradient in Burkina Faso (West Africa)

Trees contribution in improving soil carbon is well established, but few works addressed how this was affected by a climatic gradient. This research investigated effects of Vitellaria paradoxa C. F Gaertn and Parkia biglobosa (Jacq.) Benth on total parklands along rainfall gradient for recommendations tree species which better improve under specific conditions adaptation to climate change. Total at topsoil subsoil layers measured using spectrophotometry infrared method, higher when increased were respectively (1.598 ± 0.040; 1.033 0.022; 0.834 0.014; 0.857 0.016%). It (0.529 0.015%) (0.282 0.019%) V. decreased while it P. slightly. Its improvement increased. A decrease trend both from trunk outside the canopy whatever levels observed. Tree choice could play an important role crop productivity according level