WANG Hao 1,3 , ZHANG Shengyin 1,2 , ZHANG Shuncun 1,2 , HUANG Cuihua 1,2 , LIAO Jie 1,2
(1. Drylands Salinization Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. Gansu Salinization Observation and Research Station, Lanzhou 730000, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract: To differentiate the influence of salinization and alkalinization on soil formation in arid and semi-arid regions, principal component analysis and water-rock reaction simulation experiments were used in combination with the geological background in formation to compare the characteristics and causes of soil salinization in the Jingtai and Hetao irrigation areas. The results show Na+ , Cl -and SO 2-4 as the dominate ions found in the soils of the Jingtai irrigation area.
In comparison, the soilcontents of Na+,Cl -and SO2-4 of the Hetao irrigation area were relatively low, whereas the CO 2-3content was high. Soilsalinization in the Jingtai irrigation area is mainly associated with soluble salt leaching from Triassic red sandstone and Ordovician Marine siliceous rocks of the surrounding strata, whereas soil alkalinization in the Hetao irrigation area were mainly affected by the chemical weathering of the Archaean gneiss group and Proterozoic granite group in Langshan and Yinshan. Accordingly, soil salinization ( EC) and alkalinization ( pH) can be regarded as salinization processes induced by different environmental factors. Stratigraphic bedrocks and weathering mechanisms are responsible for the differences in soil salinization and alkalinization in arid and semi-arid areas.
Key words: salinity characteristics of saline soils; comparison of the causes; water-rock reaction; Jingtai irrigation area; Hetao irrigation area
EARTH AND ENVIRONMENT： Vol. 51, No. 5, Tot No.355 2023
