Nutrient changes of base material in the ecological restoration of expressway rock slope

Base on vegetation restoration engineering of rock slope of JingCheng Highway, the nutrient changes of two spraying base material, in which peat: soil was 9∶1 among base material A and soil: vegetation substrate was 6∶4 among base material B, were measured in the first year. The results of this study showed that pH value was similar and was little changeable among both base material, indicating the Acidity and Basicity did not change in the first year of vegetation restoration. The account of organic matter，total N，available P and available K of base material A decreased firstly, and then increased, and they were minimum in July because herbs grew rapidly by consuming plenty of nutrient. The account of organic matter, total N and available K in base material B decreased continually, but available P decreased firstly, and then increased. The results of variance analysis showed that the nutrients of different base material were significantly different (P＜0.05), and the nutrients of same base material were not significantly different. Two basic materials had different variation trend, which was related to not only decomposition of peat and organic fertilizer but also vegetation restoration models. This study would provide information for improving composition of base material restoring technology on the rocky slope ecological protection．