Abstract: 【Objective】The dynamic characteristics of substrate nutrition used for greening rock slopes in Hong Kong was studied.【Method】The greening effect and physical-chemical characteristics of substrate on 14 slopes, where same technique and substrate were applied throughout the past 6 years, were examined and analyzed.【Result】The pH value tend to neutral and soil hardness had a decreasing trend. The water absorbing and retaining ability of the substrate was well maintained for over 6 years and there was no significant erosion of the substrate. The content of organic matter decreased at a slow rate as the time past. The content of total nitrogen had little change while that of both total phosphorus and potassium tended to increase. A tend of available nitrogen was observed that it decreased first and increased then and decreased finally. Biomass varied obviously with different completion years, however, biomass on each slope was relatively higher than that of grassland. The coverage provided was satisfactory and the total coverage on most slopes were over 90%. The nutrition dynamic characteristics throughout 2 years of two kinds of substrates used for greening rock slopes in Hong Kong were also studied.【Conclusion】The effect of the organic substrate used for greening rock slope could be sustained and the properties of the substrate could be stabilized. In addition, nutrients that provided for plant growth could be recycled in the system. Therefore, this greening technique is suitable to establish vegetation on man-made slopes with low maintenance.

Key words: Rock slope, Substrate nutrition, Dynamic characteristic, Greening effect, Hong Kong