Analysis on characteristics of soil salinization in the arid regions:A case study in the delta oasis of Weigan and Kuqa Rivers

ZHANG Fei1,DING Jian-li1,2,TASHPOLAT·Tiyip1,WANG Bo-chao1(1.R&E Department of Xinjiang University,Lab of Simulation and Prediction for Oasis Ecosystem,Urumqi 830046,China;2.Post Doctoral Laboratory of Theoretical Economics,Xinjiang University,Urumqi 830046,China)

the delta oasis of Weigan and Kuqa Rivers;soil salinization;characteristic of soil

Soil salinization is one of the primary environmental problems,facing sustainable development in the delta oasis of the Weigan and Kuqa Rivers.First,a field survey,GPS location,soil analysis,and soil salinization levels were investigated.The content of salt ion,relation between cation and hardness,relation of the conductance rate and content of ion,relations with content of ion and total alkali,relation between the mineralization and ion in the soil,correlation of the salt ion as well as the relationship between salt amount and agricultural output were analysed with the Statistics,Excel software.Second,factor analysis was used to study the salinized situation of land in the oasis.The determination of the type of land salinized is based on its equivalent ratio of Cl-to SO42-in soil,while the differentiation of salinization degree for salinized soil is chiefly based on the type and content of soil salt.Land in the delta oasis of Weigan and Kuqa Rivers is mostly alkali soil with a pH of 7.86,and is high in salt content.Salts concentrate mostly in the 0-10 cm surface layer,and can reach 4.68%.Cations in the soil are dominated by Na+,K+,Mg2+ and Ca2+,whereas anions are in the decreasing order of Cl->SO42->HCO3-in the 0-10,10-50 cm soil layers.However,CO32-content could not be measured in the soils.The correlation between Na+ content and Cl-content was positive and extremely significant,and that between K+ content and HCO3-content was also significantly positive.All these findings further suggest that the soils are heavy chloride saline soils.