The influence of trees on soil fertility on two contrasting semi-arid soil types at Matopos, Zimbabwe

摘要: An investigation into the influence of indigenous trees on soil fertility was conducted in an area semi-arid tropical savanna Zimbabwe two contrasting types: dystrophic soils (sandy soils) and eutrophic (fine-textured soils). The study adds further support to growing literature showing that have a positive fertility. suggests tree clearance, as advocated these agropastoral systems, may not necessarily result long-term benefits. It is argued primary mechanism by which improved through increased litter organic matter compartments under trees. cation levels greater sandy than fine-textured because exchange capacity determined largely texture whereas prime determinant soils. present demonstrates improvement at expense decline surface zone around tree. Leaf quality, reflected simply leaf C:N ratio, influences decomposition rates but activities termites probably confound any simple relationship. Litter quality species important determining canopies, with higher lower quality.