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<p>Cassava sustainable production in China is hindered by the persistent oversight of the continuous cropping obstacle (CCO), exacerbated by limited land resources. Based on a four-year experiment, this study examines the impact of cropping duration on plants and soil microbes. Continuous cropping beyond three years led to a yield decline, alongside intensified soil acidification and nutrient loss. This was accompanied by a decline in soil microbial diversity, with bacterial communities showing greater vulnerability than fungal communities. The irreversible degradation of the bulk soil microbial network was found as a key driver of CCO. Following four years of monocropping, Actinobacteriota (21.33%―32.93%), Chloroflexi (14.22%―21.69%) and Acidobacteriota (9.30%―20.80%) dominated the bacterial communities, while the relative abundance of the plant growth-promoting rhizobacterium <i>Bacillus</i> in cassava rhizosphere declined. Ascomycota was the overwhelmingly dominant fungal phylum, largely composed of plant pathogens such as <i>Fusarium</i>, <i>Verticillium</i>, <i>Boeremia</i> and <i>Stachybotrys.</i> A significant increase in the relative abundance of beneficial fugal (Mucoromycota) was observed in the bulk soil under Fenlong tillage treatment. Thus, it is recommended that the duration of continuous cassava cropping should not exceed three years. For sustainable cassava production, the stability of microbial community in bulk soil must be maintained, while it serves as an early and sensitive biological indicator for predicting the risk of CCO occurrence.</p>

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Soil microbial community stability: A key to sustainable cassava production

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Qianting Liao,
  • Zhangyou Shen,
  • Guilong Li,
  • Xiaoxue Peng,
  • Xiaohui Peng,
  • Qi Liao,
  • Shangye Lao,
  • Maogui Wei

摘要

Cassava sustainable production in China is hindered by the persistent oversight of the continuous cropping obstacle (CCO), exacerbated by limited land resources. Based on a four-year experiment, this study examines the impact of cropping duration on plants and soil microbes. Continuous cropping beyond three years led to a yield decline, alongside intensified soil acidification and nutrient loss. This was accompanied by a decline in soil microbial diversity, with bacterial communities showing greater vulnerability than fungal communities. The irreversible degradation of the bulk soil microbial network was found as a key driver of CCO. Following four years of monocropping, Actinobacteriota (21.33%―32.93%), Chloroflexi (14.22%―21.69%) and Acidobacteriota (9.30%―20.80%) dominated the bacterial communities, while the relative abundance of the plant growth-promoting rhizobacterium Bacillus in cassava rhizosphere declined. Ascomycota was the overwhelmingly dominant fungal phylum, largely composed of plant pathogens such as Fusarium, Verticillium, Boeremia and Stachybotrys. A significant increase in the relative abundance of beneficial fugal (Mucoromycota) was observed in the bulk soil under Fenlong tillage treatment. Thus, it is recommended that the duration of continuous cassava cropping should not exceed three years. For sustainable cassava production, the stability of microbial community in bulk soil must be maintained, while it serves as an early and sensitive biological indicator for predicting the risk of CCO occurrence.