Analysis on Characteristics of Soil Salinity in a Typical Oasis in the Upper Reaches of the Tarim River

Study of the characteristics of spatial distribution of soil salinity and relationship between ion components is the key to understanding the salt movement regularity and establishing strategies for soil salinity management.Based on the data collected from 64 surface samples(0-20 cm),spatial variability of soil salinity in Aler reclamation area in the upper reaches of the Tarim river was analyzed by the methods of geostatistics and gray relational analysis.The results showed that: the soil salinity and alkalization were generally high;the variation was weak in pH and strong in electrical conductivity,total salt and most of the ions;the electrical conductivity,total salt and most of the ions had a higher degree of structural complexity compared with other indicators' spatial variability degree;the spatial distribution of total salt,electrical conductivity,Cl-,SO2-4,Na+,Ca2+,Mg2+ and K+ were closely related to the regional environment,which showed a decreased trend from northwest to southeast,the pH values appeared an opposite spatial distribution trend;the content of HCO-3 was the lowest in the soil,the regularity of spatial distribution was not obvious.From the analysis of grey correlation,we derived indicators which affect the salinity of the study area were SO2-4,Cl-and Na+.