Study on soil salinity content,degree and type of sali-nization in M inqin Basin
[Objective]To clarify the current status of regional soil salinization is the premise of soil salinization restoration and improvement,which is of great significance to improve land productivity and ecosystem stability.[Method]Taking the Minqin Basin arid and semi-arid areas as the study area,quantitative analysis was conducted on soil salinity in different soil layers(0～10 cm,10～20 cm and 20～30 cm),including content,distribution and correla-tion of salt base ions.The degree and type of salinization were qualitatively determined in order to provide a theoreti-cal basis for the improvement and ecological restoration of saline soil in the Minqin basin,as well as the sustainable de-velopment of regional resources and environment.[Result]1)Average soil salt content in different soil layers ranged from 4.35 to 6.37 g/kg,with a moderate degree of variability.The content of SO42-,Ca2+ and Cl-was higher,while the content of CO32-was the least.2)The anions were mainly SO42-and Cl-,with the sum of the two exceeding 50.00%of the total salt content.The cations were mainly Ca2+ and Na+,accounting for 48.65%and 31.04%of the total cations,respectively.3)Total salt was extremely significant positively correlated with SO42-,Ca2+ and Mg2+(P≤0.01),and extremely significant negatively correlated with HCO3-;4)Five types of non-salinized soil,mild,mod-erate,intense and salinized soil were all distributed in the study area,among which the moderate salinized soil was the most widely distributed(32.42%),followed by severe salinized soil(25.92%);5)The types of salinization include chloride-sulfate type,sulfate type,chloride type,sulfate-chloride type and soda type,with chloride-sulfate type being the main type(56.03%),and sulfate type being the secondary type(33.57%).[Conclusion]Salinization in the study area still poses a threat to soil security,with the degree and type mainly being moderate saline soil and chlorine-sulfate.Salt compounds are CaSO4,MgSO4,KCl and NaHCO3.
salin ionsdegree of salinizationtype of salinizationMinqin Basin
NETL
NSTL
万方数据
