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<p>Straw returning is an important way of utilizing straw resources, which can effectively increase the nutrient content of cultivated soil. However, lignocellulose is difficult for microorganisms to degrade at low temperatures, resulting in slow nutrient release and limiting its application in low-temperature areas. To enhance the degradation efficiency of lignocellulose during low-temperature straw returning, this study used straw returning combined with low-temperature bacterial agents and conducted cultivation experiments under simulated low-temperature conditions. There were six treatment groups: corn straw returning with L1 (CS-L1) or L2 (CS-L2) bacterial agent, rice straw returning with L1 (RS-L1) or L2 (RS-L2) bacterial agent. Corn and rice straw returning treatments without bacterial agents were used as controls (CS-CK and RS-CK). Meanwhile, the changes of soil nutrients, lignocellulose content and microbial community structure during the returning process under simulated low-temperature conditions were analyzed. The results showed that bacterial agents significantly increased straw weight loss rate,&#xa0;with increases of 31.82% and 40.10% in CS-L1 and CS-L2,&#xa0;respectively,&#xa0;relative to CS-CK, and 52.38% and 42.86% in RS-L1 and RS-L2, respectively,&#xa0;relative to RS-CK. Structural equation models (SEMs) indicated that soil nutrients and bacterial community structure jointly affected lignocellulose degradation during low-temperature returning. These findings provide a theoretical basis for improving the utilization efficiency of straw resources.</p> Graphical abstract <p></p>

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Revealing the Microbial Mechanism by Which Low-Temperature Bacterial Agents Drive Lignocellulose Degradation During Straw Returning

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Li Zhao,
  • Fengting Qu,
  • Xiang Li,
  • Zimin Wei,
  • Wensheng Xiang

摘要

Straw returning is an important way of utilizing straw resources, which can effectively increase the nutrient content of cultivated soil. However, lignocellulose is difficult for microorganisms to degrade at low temperatures, resulting in slow nutrient release and limiting its application in low-temperature areas. To enhance the degradation efficiency of lignocellulose during low-temperature straw returning, this study used straw returning combined with low-temperature bacterial agents and conducted cultivation experiments under simulated low-temperature conditions. There were six treatment groups: corn straw returning with L1 (CS-L1) or L2 (CS-L2) bacterial agent, rice straw returning with L1 (RS-L1) or L2 (RS-L2) bacterial agent. Corn and rice straw returning treatments without bacterial agents were used as controls (CS-CK and RS-CK). Meanwhile, the changes of soil nutrients, lignocellulose content and microbial community structure during the returning process under simulated low-temperature conditions were analyzed. The results showed that bacterial agents significantly increased straw weight loss rate, with increases of 31.82% and 40.10% in CS-L1 and CS-L2, respectively, relative to CS-CK, and 52.38% and 42.86% in RS-L1 and RS-L2, respectively, relative to RS-CK. Structural equation models (SEMs) indicated that soil nutrients and bacterial community structure jointly affected lignocellulose degradation during low-temperature returning. These findings provide a theoretical basis for improving the utilization efficiency of straw resources.

Graphical abstract