Effect of Spraying Process on Physicochemical Properties and Vegetation Restoration of Vegetative Cement-Soil

Abstract

In order to explore the influence of spraying process on the physical and chemical properties of vegetative cement-soil and the effect of vegetation restoration, this paper first prepared the same ratio vegetative cement-soil and sprayed it onto three different zones with the same slope ratio. The spraying processes are: dry-spraying (G), wet-spraying (S), and wet-praying plus dry-spraying (S&G), respectively. Then these three indexes of the vegetative cement-soil’s physical and chemical properties, plant seeds germination rate and the vegetation coverage were monitored. The results showed that different spraying techniques had different effects on the physical and chemical properties of vegetative cement-soil which can be explained in the following aspects: (1)Bulk density: G > S&G > S; (2)Porosity: S > S&G > G; (3) Compactness: G > S&G > S; (4)pH value: Spraying process has no obvious effect on pH value of vegetative cement-soil; (5)Organic matter : the initial content was basically the same, later, S and S&G were slightly larger than G; (6)Available nutrients: the initial value was basically the same, later, the available nutrients of these three processes all have some loss that was affected by rainfall, and process S was more obvious. (7)Seeds germination. Spraying process had a great influence on seed germination. G was more suitable for seed germination of herbaceous plants but shrub seeds had poor germination in vegetation cement-soil. Herbaceous plants and shrub seeds germinated better in the vegetative cement-soil with S and S&G. (8)From the aspects of vegetation coverage speed and total coverage, G and S&G were superior to S. In conclusion, from the perspective of vegetation and slope protection functions, the collaborative spraying process of S&G can effectively improve the physical and chemical properties of the vegetative cement-soil habitat substrate, promote the plant seeds germination and fast vegetation coverage, therefore, the collaborative spraying process of S&G can be used as the preferred spraying process of the vegetative cement-soil habitat construction technology.