Analysis on characteristics of soil salinization in the delta oasis of Weigan and Kuqa Rivers

Soil salinization is one of primary environmental problems in the sustainable development in the delta oasis of Weigan and Kuqa Rivers.Based on field survey,GPS location and soil analysis,soil salinization levels and distribution are investigated.Using the Statistics and Excel software,content of salt ion,relation of the conductance rate and content of ion,relation of ion content and total alkali,relation between TDS(Total dissolved solids) and ion in the soil,relation between salt content and conductivity,correlation of the salt ions,as well as the relation of salt amount and agricultural output are analyzed.The factor analysis is used to study the salinized situation of land in the oasis.The determination of the type of land salinized soil is based on its equivalent ratio of Cl-to SO42-,while the differentiation of salinization degree for land salinized soil is chiefly based on the type and content of soil salt.Lands in the delta oasis of Weigan and Kuqa rivers are mostly of alkali soil with pH value 7.86 and high in salt content.Salts concentrate mostly in the 0～10 cm surface layer,it accounts for 4.68%.Dominated cations in the soil are Na+,K+,Mg2+ and Ca2+,whereas anion content in a decreasing order are Cl-SO42-HCO3-in the 0～10 cm soil layers.However,CO32-content fails to measure in the soils.The correlation between Na+ and Cl-content is positive and extremely significant,between K+ and HCO3-content significantly positive.All these findings further suggest that the soils are heavy chloride saline soils.

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