Ecological Restoration Technology Research On Slope Of Collapsible Loess In Lanzhou

Through the experiment of plant investigation,substrate selection,effcet of vegetation restoration,combined with construction cases,this paper study on the ecological restoration technology of collapsible loess slope in Lanzhou area.According to the test content,choose suitable plants for the planting of loess slopes,the best vegetation restoration is preferred,according to the scientific construction method,we carried out slope control and demonstration in Jiuzhou area of Lanzhou City,the main achievements of the rsearch are as follows:This study uses a combination of read the literature and sample survey,surveyed on common plant of collapsible loess slope in Lanzhou Area,a total of 126 species of ground cover plants were investigated in the mountain of northern and southern of Lanzhou,where belong to 34 families and 88 genera,To Gramineae,Compositae,Leguminosae,Chenopodiaceae and other families are dominant,respectively16,18,21,6 species.The results show that: Stipa bungeana Trin,Elymus dahuricus Turcz,Caragana korshinskii Kom,Cyperus,Peganum,Achnatherum splendens,Artemisia and so on are main planting vegetation of Collapsible loess slope in Lanzhou.Analyze the survey results,choose drought and cold resistance,salt tolerance,resistance to soil barren,root developed plants,to use the way of shrubs,herbaceous plants mixed to carry out the slope of spray,which can further increase the species diversity of collapsible loess slope,improve slope stability.According to the situation of high salinity content of collapsible loess slope in Lanzhou area,the propagation of the substrate was tested.the results showed that: The use of halophilic alkaline microbial fertilizer to improve soil matrix,which can increase the substrate nutrient content,reduce the soil pH value,optimization the soil aggregate structure,make the root easier to grow,effectively improve the seed emergence rate and biomass.Optimal matrix formulation: biological bacteria fertilizer content of 500g/m~2,water retaining agent content of 0.5g,peat soil: soil: straw is40:45:15,fertilizer content of 20g/m~2.Mainly dominated by local dominance,to use a modified matrix with the scientific construction technology,study on effect of vegetation restoration of Spraying the substrate,The results show: After adding the sprayed substrate,vegetation coverage increased,aboveground biomass increased,the number of soil cracks and crack area decreased significantly,the results of vegetation restoration were significantly higher than other control(P<0.05),In addition,the amount of fertilizer application should not exceed 500g/m~2,too much fertilizer may cause the phenomenon of burning seedlings.