The Study Of Mixed Planting 4 Grass Forages’s Performance In Protecting The Slop In The Cold Semi-arid Zone

As the rapid development of our country’s high grade highway, it is more and more important to find the suitable plants and the slope protection method, especially in cold and semi-arid zone. In order to find the most suitable grass combination for protecting slop in this zone, we mixed planting 4 grass forages in Hasuhai lake-ring road embankment slope and divided them into 15 mixed combinations. Then used the AHP analytic hierarchy process to score them and to find the best combination.We used software Yaahp to built a model about different grass mixed combination which based on AHP.Through the single- level sorting and total level sorting and consistency test,we built the judgment matrix and calculated the comprehensive score of scoring system. The system take the "best mixed combination" as the target layer; take the ecological adaptability, the solid soil capability, the water retention capacity and the Landscape as the guidelines layer; take the turf speed, the winter rates, the integrated resistance, the height,the density, the cover, the root volume, the root distribution, the below ground biomass, the soil moisture,the anti-erosion ability, the above ground biomass, the leaf retention, the color,the green period and the uniformity as the index layer. We analyzed different grasses mixed combination in slope protection around the Inner Mongolia Hasuhai lake. The result showed that, the best combination is mixed by Smooth brome (Bromus inermis Leyss), Crestedwheatgrass (Agropyrom cristatum (L.)Gaertn), Dahuria wildryegrass (Elymus dahuricus Turcz) and Siberian wildryegrass (Elymus sibiricus L). The worst is the Siberian wildryegrass combination.