Transport characteristics of salt ions in soil columns planted with Tamarix chinensis under different groundwater levels.

Variation in the CO 3 2- +HCO 3 - content in the soil profile As shown in Fig 4D , the CO 3 2- +HCO 3 - content first increased and then decreased in the soil profile with increasing soil depth under the 1.8 m groundwater level, and it exhibited an increasing trend in the soil profile under the other groundwater levels.

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Variation in the SO 4 2- content in the soil profile As shown in Fig 4B , SO 4 2- in the soil profile exhibited a decreasing trend with an increasing soil depth under groundwater levels of 0.3 m, 0.6 m, and 0.9 m, while it tended to rapidly decline followed by a gradual increase under deep groundwater levels of 1.5 m and 1.8 m.

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