| Yunnan Province is a mountainous province of a large number of dams,in order to alleviate the contradictions between the people and the government put forward the policy of the town up the mountain and the development and construction of the mountain will deteriorate the ecological environment has become the focus of mountain development.Therefore,this paper chooses five typical low-hill and gentle slope project areas to study the impact of mountain development on the soil erosion in the project area and put forward the ecological restoration of the project area by combining the landform types,rainfall and project area of the project area Strategy,the Yunnan Province,low hilly slope project development and construction of a certain reference value.Yunnan Province is a mountainous province with a large number of dams.In order to alleviate the contradiction between people and land,the policy of mountain construction is put forward.Whether the development and construction of mountainous areas will aggravate the ecological environment has become the focus of mountain development.Therefore,this paper chooses five typical low-hill and gentle slope projects as the research object,and uses ArcGIS platform to study the quantitative and qualitative analysis of soil erosion in the process of mountain construction and development,and explore whether mountain development has influence on soil and water loss.Ecological restoration strategy,Yunnan Province,low hilly slope project development and construction of a certain reference value.In this paper,based on the basic data of the low-hill and gentle slope project area in Yunnan Province,this paper uses the common RUSLE model of the United States to make a comparative study on the soil and water loss before and after the development of the project area with ArcGIS software,and put forward the ecological restoration Strategy.And finally draw the following conclusions:(1)The erosion rate of the Baiyan,Rende and Jingda project areas were reduced after the development of the project area,and the erosion modulus was reduced after the development of the project area,and the soil erosion after the development wasimproved.However,the erosion modulus increased after the development of Beigu,the research and the project area.After the development,the soil erosion degree was intensified.Before and after the development of Beigu Ancient Project Area,the erosion of the project area were greatly affected by the development of the project area.Into the development of the more mild erosion.(2)from the landform type,the project area before the development and construction of the average erosion modulus is karst peak forest landform> mountain basin topography> tectonic erosion low mountain landscape> irregular hillside=plateau lake basin and eroded basin edge landform.After the development and construction of the project area,the mountain basin topography> karst peak forest landform> irregular hillside> tectonic eroded low mountain landform> plateau lake basin and erosion basin edge landform.(3)from the slope level,with the slope level rise,the degree of soil erosion increased,located in 0-15 ° mainly for the very slight erosion,15 °-25 ° mainly micro-erosion,more than 25 ° Mild erosion level above.The eroded area with strong erosion intensity is lower in the Baiyan project area,the Rende and the Jingda project area.Most of the project area belongs to the slight erosion and is below 15 °,and the soil erosion after the development has been Improved;but Beigu and Yanhe is the opposite.(4)From the land use category,Baiyan,Rende,Beigu project area erosion area is the largest dry land,Jingda project area erosion area is the largest garden,research and project area erosion area is the largest forest land.The erosion area of the dryland,paddy field and orchard after the development of Beigu ancient project area is obvious,and the erosion area of the industrial land and the communication land becomes larger.The erosion area of dry land,woodland,garden land and natural reserve area has become smaller,and the erosion area of industrial land and road land has become larger and the erosion intensity of forest land has been intensified.The erosion degree of each land use land before and after the development of other project areas is not very obvious.(5)As a result of the construction of a project area mainly for road construction,commercial land and residential land construction,these series of artificial causes of ecological landscape fragmentation,large area of forest occupied on the one hand,the diversity of biological conservation caused difficulties;On the other hand,the forest has the function of canopy closure,root water storage,improved soil properties,and the reduction of forest will increase the risk of soil erosion.The ecological environment of Beigu,the study and the project area has been damaged,leading to increased soil erosion.(6)The main reason for the improvement of soil erosion after the development of Baiyan,Rende and Jingda project areas is that the terrain and landforms have been changed during the development and construction of mountainous areas,and the slope of the flat land is slowed down.Changes in the use of land use,such as conversion to construction land,the surface nature of the change.The area of land use and development in the development of the project area is relatively large,the slope stability of the development and construction slope of the project area is serious,the soil and water loss of the mining land is serious,the destruction of the large area of the original vegetation and the human activities are intensified Reasons for Soil Erosion Degree in Project Area.(7)As the industrial construction of the Banyan,Beigu,Yanhe research and project areas of soil erosion changes are not entirely consistent with the reasons for population density,agricultural land occupation,0°-8° share,The difference of infrastructure fee and new construction land occupation caused the soil erosion in Baiyan project area is better than Beigu,Yanhe project area. |
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