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Slope eco-restoration has always received extensive attention as a positive way to reverse ecosystem deterioration derived from human interventions. A simplified framework is proposed to undertake a quantitative evaluation of the engineering disturbed slope eco-restoration success in the alpine region, southeast Qinghai-Tibet Plateau. The Dagu hydropower project that disturbs the local ecosystem to some certain was selected as the study area. Since August 2018, six types of slope (soil, rock, soil-rock, spoil, construction site, hardened) were served as the demonstration test for the slope eco-restoration with two years monitoring in the study area. Meanwhile, the topography, erosion, soil quality, and vegetation were selected as assessment indicators of the methodology. Finally, combined with the weighting method and the expert panel, the slope eco-restoration quality index (SERQI) was established and applied in the six slopes. The results suggested that the frost-resistant ecological substrate performed well in alpine region, and the SERQI value is in accordance with the actual monitoring level with spoil slope>soil slope>construction site slope>soil-rock slope>rock slope>hardened slope. The proposed framework could support slope eco-restoration practitioners for making a more objective and quantitative evaluation easily for the postimplementation restoration.

Vegetation concrete is one of the most widely used substrates for slope ecological protection in China. However, there are still some imperfections that are disadvantageous for plant growth, such as high density, low porosity, insufficient nutrient retention ability and so on. In this paper, the effect of wood activated carbon and mineral activated carbon on the physicochemical properties of vegetation concrete is studied. The experimental results show that the activated carbon proportion in vegetation concrete is positively related to the porosity, permeability coefficient, water holding capacity, and nutrient content and retention ability, while it is negatively related to the dry density, water retention ability, cohesive force and internal friction angle. However, it should be noticed that when the proportion exceeds 2%, the average height, aboveground biomass and underground biomass of Cynodon dactylon decrease with increasing proportion of activated carbon. The effect of wood activated carbon is generally more remarkable than that of mineral activated carbon. In addition, according to the research results, the effect of activated carbon on vegetation concrete can last for at least half a year, although it does slowly deteriorate with increasing time. By comprehensive consideration of the current industry standard, previous research results and economical reasoning, the recommended type of activated carbon is wood, with a corresponding suitable proportion ranging between 1 and 2%.

Vegetation concrete is a typical artificial composite soil commonly used for ecological restoration on slopes. The strength and stability of vegetation concrete would be reduced when it is used in ...