Regarding the vegetation recovered for 3years on Beijing-Chengde third-phase freeway slopes as the study object

we conducted an investigation of soil nutrient status and analyzed the main factors affecting soil nutrients.Results showed that soil pH values were mostly about 6.5;soil organic matter contents on 86.73% of the slopes and total nitrogen contents on 88.78% of the slopes

in upper level;available phosphorus contents on 90.82% of the slopes

in rich level;and available potassium contents on 73.74% of the slopes

in low-middle level.This indicated that available phosphorus was the key nutrient factor for plant growth undere the current construction techniques and curing conditions.Slope material

slope direction and construction techniques had more effects on total nutrient content on the slopes.