Ion absorption, distribution and salt tolerance threshold of three willow species under salt stress.

In the first 3, 8, and 8 days, with the increase of salt stress, Salix linearistipularis , Salix matsudana and Salix gordejevii showed a trend of increasing first and then decreasing ( Figures 4A–C ).

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In the first 3 days, the Na + /Ca 2+ of willow root leaves showed an increasing trend compared with CK, but the difference was not significant.

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With the aggravation of salt stress and the prolongation of stress time, the Ca 2+ contents in the roots and leaves of the three species of willow showed a decreasing trend ( Figure 3 ).

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