Two ecological restoration technologies

i.e.

vegetation-growing concrete base material spraying technology(CBS) and the external-soil spray seeding technology(ESS)

were applied in ecological restoration area of the Guandi Hydropower Station on the Yalong River to study soil fertility in the preliminary stage of ecological restoration. Six soil fertility indexes were measured by selecting four ecological restoration slopes and one contrast slope. Then the method of standard comprehensive assessment on fertility grade was employed to analyze the variation of soil fertility. Results showed that the contents of soil organic matter

total nitrogen

total phosphorus

available nitrogen

available phosphorus and available kalium on the four ecological restoration slopes were larger than the contrast slope. The soil fertility on the four slopes was also significantly higher than the contrast slope. The slope on right riverbank with CBS applied had the highest soil fertility. Therefore

the two ecological restoration technologies can improve soil quality in the study area

but the benefits of using CBS were better than ESS.