Fig. 4. Mean species richness in mixed food crop fields established after clearing three short-fallow types at Mengomo, southern Cameroon in 1999. Co–Co: C. odorata-dominated fallows that had also been C.odorata-dominated fallows in the previous cropping rotation; Co–Fo: C. odorata-dominated fallows that had been forests prior to the preceding cropping phase; Bu–Fo: bush fallows (not dominated by C. odorata) that had been forests prior to the preceding cropping phase. WAP = weeks after planting.