|其他摘要||With the rapid development of highway, railway, water conservancy project construction, during the construction of earth fill and cut formed a large number of bare slope, destroyed the original topography vegetation, causing damage to the ecological environment. Slope itself has a certain amount of self-healing and the ability to recover, but the repair methods often take a long time, if the use of artificial ecological engineering measures so as to gradually recover, you can greatly reduce the time. Ecological restoration also has good economic, ecological and social benefits. This paper selects the West Main Canal water diversion project slope as study. Investigate the soil salinity, water distribution, distribution of plant communities of the slope. Select the monitoring point on the landscape situation and slope erosion engineering investigation and analysis. Classified the slopes according to the situation of the West Main Canal and analyze the causes of slope hazards. And select the typical use slope erosion vegetation practice of ecological protection, draw the following conclusions:
1) The dominant vegetation in West trunk area is desert plants, there are low sparse, the species is poor and simple structure. The plant community mostly is single dominant species; the plant construction group is significantly such as Anabasis salsa, the distribution changes with the matrix, the community habitat, the water and salt.
2) The rain precipitation is poor, the evaporation is strong, it is high water table, and the soil is salinization in west trunk area. The main source of soil moisture supply is precipitation and seasonal snow-melt. The moisture of soil in shady slope is higher than water content of sunny slope; the natural landscape moisture is the lowest. The soil organic matter (0.27%) is only half the average level of soil organic matter (0.5%) in Northwest China, belong a relatively poor soil. Based on the amount of soil salinity, chloride content and sulfate content ,select 11 monitoring points as the survey, five soil samples belonging to the saline soil area even saline area, takes the 0-20 cm of soil into 0-2 cm, 2-10 cm and 10-20 cm three studies, there are obvious differences in the distribution of salinity, the highest in 10-20cm layer, 0-2 cm layer of the lowest, that is from the perspective of the soil profile analysis, soil salinity increases gradually in accordance with the distribution of 0-20 cm from top to bottom. Takes the soil salinization classification as concerned, the top down, non-saline soil, saline soil and the weak soil, saline soil is the main cause of sparse vegetation in the area.
3) In terms of plant adaptability, the soil quality is low in west trunk slope area; especially the soil salinization is severe, caused certain stress on plant growth. For high soil salinity slope characteristics, combined with the needs of ecological restoration, we should focus on salt-tolerant and drought-tolerant plant selection, planting and irrigation in screened out suitable slope salt, drought resistance strong plant species such as Nitraria sibirica Pall. Finally, the vegetation was investigated to verify the accuracy of the slope site evaluation.|