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Background and Aims <p>Biological soil crusts (biocrusts) in conservation tillage farmland can cover up to 70% of the soil. However, most previous research has focused on biocrusts in arid and semiarid regions. Few studies have examined the ecological functions of farmland biocrusts in humid zones.</p> Methods <p>In this study, we analyzed the effects of different tillage treatments, namely, no tillage (No-Till), reduced tillage (Red-Till), regular tillage (Reg-Till), and a control group without biocrusts (No-Crust), on soil aggregate stability in the black soil region of Northeast China at depths of 0–2&#xa0;cm and 2–5&#xa0;cm.</p> Results <p>The results revealed that the Red-Till treatment showed the highest average content of soil particles larger than 5&#xa0;mm (39%). Compared to the No-Crust control, the mean weight diameter (MWD) under Red-Till significantly increased by 73.30% at the 0–2&#xa0;cm depth and by 31.06% at the 2–5&#xa0;cm depth. The effect of Red-Till on the geometric mean diameter (GMD) was similar to that on MWD, whereas the impacts on the fractal dimension (D) and percentage of aggregate destruction (PAD) were opposite. Redundancy analysis revealed that Red-Till enhanced soil organic carbon and microbial biomass nitrogen levels by increasing cyanobacteria cover, thereby increasing soil aggregate stability.</p> Conclusion <p>These findings provide theoretical guidance for adjusting tillage treatments and promoting better agricultural management in black soil regions of China and similar areas globally.</p>

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Cyanobacteria-mediated enhancement of soil aggregate stability in biocrusted farmland under reduced tillage: evidence from Northeast China's black soil region

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Tian Li,
  • Zihan Wu,
  • Chengshi Yu,
  • Jinshi Zhan,
  • Yuguang Wang,
  • Tianli Bao

摘要

Background and Aims

Biological soil crusts (biocrusts) in conservation tillage farmland can cover up to 70% of the soil. However, most previous research has focused on biocrusts in arid and semiarid regions. Few studies have examined the ecological functions of farmland biocrusts in humid zones.

Methods

In this study, we analyzed the effects of different tillage treatments, namely, no tillage (No-Till), reduced tillage (Red-Till), regular tillage (Reg-Till), and a control group without biocrusts (No-Crust), on soil aggregate stability in the black soil region of Northeast China at depths of 0–2 cm and 2–5 cm.

Results

The results revealed that the Red-Till treatment showed the highest average content of soil particles larger than 5 mm (39%). Compared to the No-Crust control, the mean weight diameter (MWD) under Red-Till significantly increased by 73.30% at the 0–2 cm depth and by 31.06% at the 2–5 cm depth. The effect of Red-Till on the geometric mean diameter (GMD) was similar to that on MWD, whereas the impacts on the fractal dimension (D) and percentage of aggregate destruction (PAD) were opposite. Redundancy analysis revealed that Red-Till enhanced soil organic carbon and microbial biomass nitrogen levels by increasing cyanobacteria cover, thereby increasing soil aggregate stability.

Conclusion

These findings provide theoretical guidance for adjusting tillage treatments and promoting better agricultural management in black soil regions of China and similar areas globally.