Variation trends and influencing factors of shallow soil salinity in arid area of Xinjiang
Wang Shaoli1,2, Jiao Pingjin1,2, Xu Di1,2, Qu Xingye1,2
1.National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China; 2. Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China
Abstract：Annual variations of shallow soil salinity and its influencing factors were evaluated by using statistical and other correlation analysis methods in the irrigation district of 125 group of seventh division commander in Xinjiang based on the salinity collected in 0-30 cm soil layer at 169 points during 2002—2008. The results showed that the average soil salinity has been a decreasing trend since 2002, and the desalinization ratio of soil has decreased to 18%. The soil salinity is mainly affected by rainfall, followed by soil texture, service life of drip irrigation installation, soil background salinity and groundwater depth, but all those are not significant compared with rainfall. A wider variation range of shallow soil salinity is observed in light soil than in heavy soil, and the light soil is prone to salt accumulation and desalinization. There is no obvious difference in shallow soil salinity between various service lives of drip irrigation installation. The relationship between shallow soil salinity and annual rainfall is established based on the difference between an annual rainfall and the averaged rainfall over recent years as well as the difference in shallow soil salinity between the next year and this year. With the relationship, 192 mm balance rainfall is proposed to keep shallow soil salinity in stable; further, the soil salinity and water control measurers in the next year can be predicted according to the diffe-rence between the rainfall in the current year and the balance rainfall.
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