Abstract:

To study the salinity characteristics and distribution of typical oasis land in Xinjiang, we took the land of the 31^st regiment of the Second Division of Xinjiang Production and Construction Corps as an example, used GPS to conduct the fixed-point sampling (N=66), the sampling depth was 100 cm of 5 layers. The soil salt ion was tested, and SPSS software was used to perform descriptive, inter-ion correlation and ion principal component analysis. The results showed that the ions in different soil layers were at a medium or higher variation level with pH 8.11, and the content of Cl^-, K⁺+ Na⁺ and SO₄^2- in each soil layer was greater than that of HCO₃^-, Ca²⁺ and Mg²⁺; the correlation coefficient of Cl^-, K⁺+ Na⁺, SO₄^2-, Ca²⁺ and Mg²⁺ was relatively high, showing a very significant correlation. The first main component of each soil layer mainly contained Cl^-, SO₄^2-, Ca²⁺, Mg²⁺, K⁺+ Na⁺ ion information, and the second and third main components mainly contained HCO₃^- ion information. Based on the different information represented by the first, the second and the third principal component, the salinization degree and alkalinity of different soil layers in different locations in the study area were analyzed. The study area was greatly affected by salt and alkali.

Key words: soil layer, salt ion, principal component, correlation, pH, salinization, spatial variability