ROOTING CHARACTERISTICS OF SOME TROPICAL PLANTS FOR SLOPE PROTECTION

摘要

The examination of root architecture and mechanical properties of tropical plants are limited. Thus, this study was aimed at investigating root architectural and mechanical properties of seven tropical plants. Based on root growth pattern, it was observed that Leucaena leucocephala and Pterocar pusindicus had taproots and their lateral roots grew horizontally and profusely. Therefore, the root systems of L. leucocephala and P. indicus were categorised as VH-type and the trees were recommended for planting in the middle of the slope. Peltophorum pterocarpum and Acacia mangium exhibited R-and H-types root systems respectively and were also recommended for planting in the middle of the slope. Melastoma malabathricum, Dillenia suffruticosa and Lantana camara possessed shallow roots. Their root systems were more similar to the M-type and these plants were suggested for planting at the top or toe of the slope. Leaf area index and root biomass of the species were positively correlated (r(2) = 0.90). Tensile strength decreased with increasing root diameter, implying that lower root diameter contributed to the higher tensile strength. Different plants have different types of root architecture and tensile strength. These rooting characteristics can be used as important factors in selecting potential plants for slope stability.