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Purpose <p>Soil amendment application has been proposed as an effective approach to remediate Cd contamination and improve soil nutrient status. Most previous studies have emphasized Cd immobilization, whereas few studies have evaluated the influences of amendments on P transformations in Cd-contaminated agricultural soil that are often P-limited.</p> Methods <p>In this study, different soil amendments (i.e. control, 0.3% lime application, 1.0% biocarbon application) were applied to cadmium (Cd)-contaminated soils to conduct pot experiments with <i>Brassica napus. PhoD</i> sequencing, bioavailable P extraction, and other techniques were used to investigate the effects of the different amendments on P availability and the bacterial community of the <i>phoD</i> gene.</p> Results <p>We found that the lime incorporation had stronger effects on the chemical P fractions than the biochar treatment. The increments of labile organic P content for the lime soils was 59.9% greater than those for the biochar treatment. However, biochar incorporation had stronger impacts on microbe-related P properties (alkaline phosphatase activity (ALP) increased by 42.0% and microbial P quotient increased by 2.6 times) than lime application (only ALP increased by 28.0%). Similarly, the bacterial community with <i>phoD</i> genes responded more strongly to lime amendments than to biochar amendments. Only lime application significantly enhanced the relative abundance of <i>Bacillus</i> by 22.5 times and reduced the relative abundance of <i>Bradyrhizobium</i>, <i>Pseudomonas</i>, and <i>Auraticoccus</i> by 70.2%, 32.6%, and 95.1%, respectively. Finally, the study found that soil pH was the determining factor of the <i>phoD</i>-harboring microbial community change.</p> Conclusions <p>Overall, these findings suggest that compared with the mild biochar amendment, the effect of lime application tends to have a greater effect on soil P transformation processes.</p>

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Phosphorus transformation after amendment applications in rapeseed soil with cadmium contamination

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Zhuoqing Li,
  • Yuexing Huang,
  • Jiayi Wu,
  • Boqing Tie,
  • Xia Lu,
  • Ming Lei,
  • Xinqi Wang

摘要

Purpose

Soil amendment application has been proposed as an effective approach to remediate Cd contamination and improve soil nutrient status. Most previous studies have emphasized Cd immobilization, whereas few studies have evaluated the influences of amendments on P transformations in Cd-contaminated agricultural soil that are often P-limited.

Methods

In this study, different soil amendments (i.e. control, 0.3% lime application, 1.0% biocarbon application) were applied to cadmium (Cd)-contaminated soils to conduct pot experiments with Brassica napus. PhoD sequencing, bioavailable P extraction, and other techniques were used to investigate the effects of the different amendments on P availability and the bacterial community of the phoD gene.

Results

We found that the lime incorporation had stronger effects on the chemical P fractions than the biochar treatment. The increments of labile organic P content for the lime soils was 59.9% greater than those for the biochar treatment. However, biochar incorporation had stronger impacts on microbe-related P properties (alkaline phosphatase activity (ALP) increased by 42.0% and microbial P quotient increased by 2.6 times) than lime application (only ALP increased by 28.0%). Similarly, the bacterial community with phoD genes responded more strongly to lime amendments than to biochar amendments. Only lime application significantly enhanced the relative abundance of Bacillus by 22.5 times and reduced the relative abundance of Bradyrhizobium, Pseudomonas, and Auraticoccus by 70.2%, 32.6%, and 95.1%, respectively. Finally, the study found that soil pH was the determining factor of the phoD-harboring microbial community change.

Conclusions

Overall, these findings suggest that compared with the mild biochar amendment, the effect of lime application tends to have a greater effect on soil P transformation processes.