Effects of Soil Salinity on Plant Growth and Salt Transport Capacity of Suaeda salsa
This study investigated the effects of varying soil salinity levels on the growth and salt trans-port capacity of Suaeda salsa(L.)Pall.S.salsa was selected as the test species,and a barrel planting experiment was conducted with six salinity treatments:10.21 g/kg(S1),20.92 g/kg(S2),30.29 g/kg(S3),40.55 g/kg(S4),50.36 g/kg(S5),and a control treatment(CK)with 6.20 g/kg soil salt con-tent.Plant growth parameters and salt transport capacity were assessed at four growth stages to identify optimal salinity conditions for S.salsa cultivation and ecological restoration in saline soils.The results showed that across all growth stages,the treatment with 20.92 g/kg soil salinity(S2)resulted in the most favorable growth performance for S.salsa,as evidenced by significantly higher plant height,stem diam-eter,fresh weight,and dry weight compared to other treatments.Specifically,at maturity stage,these parameters increased by 29.87%,47.75%,33.54%,and 19.45%,respectively,in the S2 treatment compared to CK.Increased soil salinity generally promoted stem and leaf succulence throughout the adult plant,flowering,and mature stages.Across treatments,a trend of decreasing succulence was observed from the seedling stage to the mature stage.Leaf tissue exhibited the highest salt transfer amount across all treatments,followed by stem and seed.As plants progressed through the growth stages,the ash content in all treatments decreased,likely due to dilution by increasing biomass.However,salt transfer amount con-tinuously increased,reaching a peak at the mature stage.The S2 treatment displayed the greatest salt trans-fer amount(4250.41 kg/hm2).These findings suggest that a soil salinity level of 20.92 g/kg promotes optimal plant growth status and salt transfer ability in S.salsa.
Suaeda salsaSaline-alkali landPlant growthSalt transfer amount
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