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Aims <p>The eastern coastal regions of China, which are undergoing rapid economic development, are characterized by extensive areas of coastal silt&#xa0;soil (CSS) with poor permeability, high salinity, and nutrient scarcity, necessitating immediate remediation.</p> Methods <p>Based on&#xa0;the intercropping pattern of&#xa0;<i>Suaeda glauca</i> (Bunge) Bunge&#xa0;and&#xa0;<i>Sesbania cannabina</i> (Retz.) Pers., the molecular mechanism&#xa0;of this intercropping&#xa0;pattern on the CSS improvement, and the rhizosphere microbial community adaptability&#xa0;of the two intercropping plants, were researched by means of metagenomics analysis, soil physicochemical&#xa0;properties,&#xa0;plant growth status.</p> Results <p>The results demonstrated&#xa0;that the improvement of soil salinity and alkalinity was positively correlated with the growth&#xa0;of&#xa0;<i>S. glauca</i>. Conversely, the growth of&#xa0;<i>S. cannabina</i>, was positively correlated with the significant increase in the contents of soil TN and TOC. Metagenomic analysis&#xa0;indicated&#xa0;that the rhizosphere of&#xa0;<i>S. cannabina</i>&#xa0;intercropped with&#xa0;<i>S. glauca</i>&#xa0;was enriched with bacteria&#xa0;related to nitrogen-cycle, which could assist biological nitrogen-fixation, thereby enhancing soil fertility and also promoting the growth of&#xa0;<i>S. glauca</i>; moreover, the two-component system&#xa0;in the rhizosphere microbial community of&#xa0;<i>S. cannabina</i>&#xa0;was&#xa0;enhanced to adapt better to saline-alkali stress. Due&#xa0;to the characteristics of salt-accumulation, the rhizosphere microenvironment of&#xa0;<i>S. glauca</i>&#xa0;was highly saline, and its rhizosphere microorganisms mainly resisted,&#xa0;and adapted to,&#xa0;the high-salt environment by promoting carbohydrate metabolism and energy metabolism.</p> Conclusions <p>This study confirms that intercropping&#xa0;<i>S. glauca</i>&#xa0;with&#xa0;<i>S. cannabina</i>&#xa0;is an effective strategy for improvement of saline-alkali soil, providing a new method for management and sustainable development&#xa0;of CSS.</p>

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The molecular mechanism for improvement of coastal silt soil by the intercropping model of Suaeda glauca (Bunge) Bunge and Sesbania cannabina (Retz.) Pers

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Xiaochi An,
  • Ying Li,
  • Yinhua Cao,
  • Zaifeng Wang,
  • Min Xu,
  • Bin Lian

摘要

Aims

The eastern coastal regions of China, which are undergoing rapid economic development, are characterized by extensive areas of coastal silt soil (CSS) with poor permeability, high salinity, and nutrient scarcity, necessitating immediate remediation.

Methods

Based on the intercropping pattern of Suaeda glauca (Bunge) Bunge and Sesbania cannabina (Retz.) Pers., the molecular mechanism of this intercropping pattern on the CSS improvement, and the rhizosphere microbial community adaptability of the two intercropping plants, were researched by means of metagenomics analysis, soil physicochemical properties, plant growth status.

Results

The results demonstrated that the improvement of soil salinity and alkalinity was positively correlated with the growth of S. glauca. Conversely, the growth of S. cannabina, was positively correlated with the significant increase in the contents of soil TN and TOC. Metagenomic analysis indicated that the rhizosphere of S. cannabina intercropped with S. glauca was enriched with bacteria related to nitrogen-cycle, which could assist biological nitrogen-fixation, thereby enhancing soil fertility and also promoting the growth of S. glauca; moreover, the two-component system in the rhizosphere microbial community of S. cannabina was enhanced to adapt better to saline-alkali stress. Due to the characteristics of salt-accumulation, the rhizosphere microenvironment of S. glauca was highly saline, and its rhizosphere microorganisms mainly resisted, and adapted to, the high-salt environment by promoting carbohydrate metabolism and energy metabolism.

Conclusions

This study confirms that intercropping S. glauca with S. cannabina is an effective strategy for improvement of saline-alkali soil, providing a new method for management and sustainable development of CSS.