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Aims <p>To test the impact of interactions between salt and cadmium (Cd) on halophyte growth and soil quality.</p> Methods <p><i>Suaeda salsa</i>, a typical salt-aggregating plant in the Yellow River Delta (YRD), was used as a study subject. Soils with three salt classes were created and five Cd contamination concentrations were applied to each salt treatment to measure <i>S. salsa</i> growth and soil quality indicators.</p> Results <p>Salt at 1.2% and Cd contamination greater than 0.6&#xa0;mg·kg<sup>−1</sup> significantly inhibited the germination and growth of <i>S. salsa</i> while reducing nutrient uptake and soil enzyme activities. The S1C1 and S1C2 treatments significantly increased the seed germination rate of <i>S. salsa</i>. Under the S1C1 treatment, both shoot and leaf tissues presented greater total phosphorus (TP) and total potassium (TK) contents, as well as increased soil enzyme activities, than those under the C0 treatment, indicating a "low promotion, high inhibition" pattern. In addition, elevated salt concentrations and Cd concentration negatively impacted the growth of <i>S. salsa</i> by reducing plant nutrient uptake (TN, TP, and TK) and inhibiting the activities of soil enzymes such as urease and sucrase. In general, the salt marsh with a low salt concentration (0.3%) and low Cd contamination (0.3&#xa0;mg·kg<sup>−1</sup>) was suitable for planting <i>S. salsa</i>, which provides favorable support for vegetation restoration and soil improvement in the salt marsh.</p> Conclusions <p>Planting <i>S. salsa</i> in salt marshes with low salt concentration (0.3%) and low Cd contamination (0.3&#xa0;mg·kg<sup>−1</sup>) is recommended for vegetation restoration and soil improvement purposes.</p>

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Effects of salt and cadmium stress on Suaeda salsa growth and soil quality

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Ke Zhang,
  • Rui Wang,
  • Shuo Li,
  • Qian Cui,
  • Jiangbao Xia

摘要

Aims

To test the impact of interactions between salt and cadmium (Cd) on halophyte growth and soil quality.

Methods

Suaeda salsa, a typical salt-aggregating plant in the Yellow River Delta (YRD), was used as a study subject. Soils with three salt classes were created and five Cd contamination concentrations were applied to each salt treatment to measure S. salsa growth and soil quality indicators.

Results

Salt at 1.2% and Cd contamination greater than 0.6 mg·kg−1 significantly inhibited the germination and growth of S. salsa while reducing nutrient uptake and soil enzyme activities. The S1C1 and S1C2 treatments significantly increased the seed germination rate of S. salsa. Under the S1C1 treatment, both shoot and leaf tissues presented greater total phosphorus (TP) and total potassium (TK) contents, as well as increased soil enzyme activities, than those under the C0 treatment, indicating a "low promotion, high inhibition" pattern. In addition, elevated salt concentrations and Cd concentration negatively impacted the growth of S. salsa by reducing plant nutrient uptake (TN, TP, and TK) and inhibiting the activities of soil enzymes such as urease and sucrase. In general, the salt marsh with a low salt concentration (0.3%) and low Cd contamination (0.3 mg·kg−1) was suitable for planting S. salsa, which provides favorable support for vegetation restoration and soil improvement in the salt marsh.

Conclusions

Planting S. salsa in salt marshes with low salt concentration (0.3%) and low Cd contamination (0.3 mg·kg−1) is recommended for vegetation restoration and soil improvement purposes.