A Study on the Seeding Mixture Improvements for the Restoration and Revegetation of the Slopes by the Thin-Layer-Soil-Media Hydroseeding Revegetation Measures

This study aimed to address problems and suggest solutions in applying seed mixture design criterior of slope revegetation works according to the Slope revegetation design and guidelines(proposed) proposed by the Ministry of Construction and Transportation. To do this, a proper thickness of attaching soil media was identified in April experiment where the thickness and slopes varied. The results were as follows. In the test, the coverage rate of plot where exotic grass was not sowed increased with time and was 79.3% after three months of seeding, which indicated less risk of soil erosion. When applying the provisional standards of the plant mix proposed by the Ministry of Construction and Transportation, tree seeds and native plants were found ill in the early stage in all test lands due to exotic grass. This was because exotic grass which grew well in the early stage, could grow densely, so it might hamper the growth of other plants. When slope revegetation were planted and goals were set for herb, shrub and tree dominant mixture types, it was required to shift focus toward nursing up native plants first rather than early plantation of exotic grass.