Effects of Groundwater Burial Depth on the Salt Ion Content of Surface Soil in Dunhuang West Lake Reserve
Soil salinity content and groundwater burial depth are important indicators for assessing the prevention and control of soil salinization and the restoration of vegetation in Dunhuang west lake reserve.In Yangquan Bay,Houkeng,Maquan Bay,Yanchi Bay and Huoshao lake in Dunhuang west Lake reserve,the study systematically analyzes the relationship between the burial depth of groundwater and the content of soil salt isolates in the surface(0-5 cm)by using the methods of field soil sampling and laboratory analysis and testing.The results show that the places where the groundwater level is shallow mainly has sulfate type and chloride sulfate type soil salinization,while the places where the groundwater level is deep is mainly characterized by sulfate-chloride-type soil salinization.As the buried depth of the groundwater level changes from shallow to deep,the content of the eight maior ions(Na+,Ca2+,Mg2+,SO42-,Cl-,HCO3-)in the surface(0-5 cm)soil tends to increase firstly and then decrease,while the change of K+and CO32-ions is not obvious.After analysis and research,it is found that the burial depth of groundwater has a significant impact on soil salinity,and it is necessary to prevent the further intensification of soil salinization by controlling the depth of groundwater level in an appropriate range.
groundwater depthsoil salt ionssoil salinizationcontrol measures
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