Analysis of soil salinity characteristics of oasis in the lower reaches of the Kaidu River

Taking the oasis in the lower reaches of the Kaidu River as the case study area,through the field investigation,sampling and laboratory experimental analysis,adopted the application of statistical method and principal component analysis method to research the characteristics of regional soil salinity.The results showed that:(1)In 0~10 cm soil layer,the soil salinity content was 0.7348 g·kg-1,in10~30 cm,the soil salinity was 0.2070 g·kg-1,in30~50 cm,the soil salinity was 0.1852 g·kg-1.The soil salinity was decreased with the increasing soil depth.The variation coefficient of the soil salinity was 319%,211%and 193%,respectively.It was shown strong variability.(2)In the soil layer of 0~10 cm,10~30 cm and30~50 cm,with the increasing soil depth,the average value of Cl-,SO42-,Mg2+and K++Na+ions was gradually reduced,on the whole salt distribution possessed a strong surface accumulation.(3)The characteristic factors of soil salinization were Cl-and SO42-.(4)The average value of total soil salt for unused land,farmland and forestland was 0.4420 g·kg-1,0.0755 g·kg-1 and 0.0414 g·kg-1,respectively.The unused land was higher than other land use types,the farmland was the second and forestland was the minimum.