Effects of Irrigation Methods on Soil Salinization in Shizuishan Area
Soil samples were collected from the 0～20 cm,21～40 cm,41～60 cm,61～80 cm,and 81～100 cm soil layers in fields irrigated by surface flooding,sprinkler irrigation,and drip irrigation in Shizuishan City,Ningxia.The effects of the three irrigation methods on soil salinization were analyzed.The results showed that ① the average mass ratio of salt content in different soil layers under surface flooding and sprinkler irrigation had similar changing trends.Surface desalination and subsoil salt accumulation were evident in sprinkler-irrigated fields,while soil salinization was evident in drip-irrigated fields.② Except Pingluo County,the current area of cultivated land affected by varying degrees of salinization is 542.47 km2,accounting for 52.33%of the total cultivated land area in Shizuishan.According to the classification standard for soil salinization,the soil in surface-flooded fields was non-salinized,while the soil in sprinkler-irrigated and drip-irrigated fields was slightly salinized.③ Sprinkler irrigation and drip irrigation had a significant impact on the concentration of anions and cations in the soil,while surface flooding had little effect.The content of SO42-and Na+ was significantly influenced by the irrigation methods.
Shizuishan areairrigation methodssalt and alkali degreesoil salt contenteight major salt ions
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