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Background <p>Afforestation is regarded as an effective strategy to increase carbon (C) sequestration. Mulberry plantation has both economic and cultural significance. However, the study of its influence on soil C pool stability remains limited.</p> Methods <p>The chemical and physical stability characteristics of soil C in mulberries and control wastelands were determined. The mechanism underlying C pool stability change was analyzed in conjunction with soil physicochemical properties, microbial metagenomic characteristics, and climatic factors.</p> Results <p>(1) Compared with wastelands, mulberries showed a 26.6% increase in total soil organic carbon (TSOC) content, and the macroaggregates C content contributing 79.51%; the content of recalcitrant OC (F4) significantly increased by 97.57%, and the stability coefficient increased from 0.92 to 1.30. (2) The relative abundance of Glomeromycetes increased by 81.87% and encoding C degradation and fixation related genes 27 out of 35 genes significant increase. (3) The C cycle genes abundance in mulberry soils were positively correlated with F4, SOC in macroaggregates, and TSOC; in wasteland soil, most of the genes above were positively correlated with labile OC, SOC in silt + clay and TSOC. The correlation between Glomeromycetes and C characteristics were weak. (4) High MAP and MAT increased C cycling gene abundance by decreasing pH. In mulberry soils, an increase in C cycling genes abundance promoted the accumulation of stable C fractions. Conversely, in wasteland soils, it favored the accumulation of active C fractions.</p> Conclusion <p>Our research results provide a theoretical foundation for the evaluation and management of soil C pool stability in mulberry planting systems.</p>

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Mulberry (Morus alba L.) planting increased the abundance of soil carbon cycling functional genes by improving soil properties, and further enhanced the stability of soil carbon pool

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Meina Zhu,
  • Zi Yang,
  • Zhenjiang Wang,
  • Victor Edem Tsigbey,
  • Zipei Cui,
  • Wenfeng Zhang,
  • Weijun Zhu,
  • Jianbin Li,
  • Changyu Qiu,
  • Qiang Lin,
  • Haonan Li,
  • Hanfa Shahid,
  • Mengdi Zhao,
  • Weiguo Zhao

摘要

Background

Afforestation is regarded as an effective strategy to increase carbon (C) sequestration. Mulberry plantation has both economic and cultural significance. However, the study of its influence on soil C pool stability remains limited.

Methods

The chemical and physical stability characteristics of soil C in mulberries and control wastelands were determined. The mechanism underlying C pool stability change was analyzed in conjunction with soil physicochemical properties, microbial metagenomic characteristics, and climatic factors.

Results

(1) Compared with wastelands, mulberries showed a 26.6% increase in total soil organic carbon (TSOC) content, and the macroaggregates C content contributing 79.51%; the content of recalcitrant OC (F4) significantly increased by 97.57%, and the stability coefficient increased from 0.92 to 1.30. (2) The relative abundance of Glomeromycetes increased by 81.87% and encoding C degradation and fixation related genes 27 out of 35 genes significant increase. (3) The C cycle genes abundance in mulberry soils were positively correlated with F4, SOC in macroaggregates, and TSOC; in wasteland soil, most of the genes above were positively correlated with labile OC, SOC in silt + clay and TSOC. The correlation between Glomeromycetes and C characteristics were weak. (4) High MAP and MAT increased C cycling gene abundance by decreasing pH. In mulberry soils, an increase in C cycling genes abundance promoted the accumulation of stable C fractions. Conversely, in wasteland soils, it favored the accumulation of active C fractions.

Conclusion

Our research results provide a theoretical foundation for the evaluation and management of soil C pool stability in mulberry planting systems.