干旱区人工绿洲水土环境脆弱性评价.

Aiming at the problem that it is difficult to quantitatively describe the vulnerability of water and soil environment of artificial oasis in arid areas, taking Jingtaichuan Electric Power Irrigation District in Gansu Province as the research area, through data collection and analysis, the soil salinity and land use types that directly participate in driving the regional water and soil environment differentiation are selected., vegetation coverage, soil conductivity, surface irrigation, groundwater salinity, groundwater depth, altitude, slope, average annual precipitation, average annual evaporation, average annual temperature 12 indicators, based on cloud theory to improve the analytic hierarchy process The weight of each index is determined, and ArcGIS software is used as the technical platform to superimpose the spatial distribution results of each index according to the corresponding weight, so as to realize the visual expression of the spatial differentiation characteristics of soil and water environment vulnerability in the study area. The results show that the vulnerability of soil and water environment in the study area is basically maintained at grades I to III, and the overall spatial distribution pattern is low in the west and high in the east. Severely vulnerable and extremely vulnerable areas are concentrated in the closed hydrogeological unit in the eastern part of the irrigation area; soil salinity, Vegetation coverage, land use type, and surface irrigation are the main factors that affect the vulnerability of soil and water environment at the regional scale. [ABSTRACT FROM AUTHOR]