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<p>Composting is a key method for recycling agricultural waste, but its efficiency is often limited by the slow degradation of lignin and insufficient humus formation. Photodegradation has emerged as a promising strategy to accelerate this process; however, the specific mechanisms of action for different spectral components remain unclear. This study systematically investigated the effects of various light treatments—including full spectrum, no-UV-B, no-UV, no-UV &amp; blue light, full-blocked, and no film—on the physicochemical properties, lignin structure, and humification during wheat straw composting. Results showed that all light treatments except the full-blocked one promoted lignin degradation and humus accumulation. Notably, no-UV-B radiation exhibited the most pronounced effect, significantly enhancing side-chain oxidation and demethylation of lignin, and reducing the contents of cellulose, hemicellulose, and lignin by 43%, 43%, and 51%, respectively. Analyses using Structural Equation Modeling (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) indicated that the observed enhancement in lignocellulose degradation was primarily associated with oxidative pathways, while the promoted humification was largely linked to the phenol–protein pathway. Consequently, composting under no-UV-B radiation achieved optimal physicochemical properties within just 30&#xa0;days. This study provides a crucial theoretical foundation and technical reference for the efficient and large-scale conversion of agricultural waste through photodegradation-assisted composting.</p>

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Positive effects of light radiations on lignin decomposition and humification process during wheat straw composting

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • P. Wang,
  • Z. Y. Wang,
  • L. Zhang

摘要

Composting is a key method for recycling agricultural waste, but its efficiency is often limited by the slow degradation of lignin and insufficient humus formation. Photodegradation has emerged as a promising strategy to accelerate this process; however, the specific mechanisms of action for different spectral components remain unclear. This study systematically investigated the effects of various light treatments—including full spectrum, no-UV-B, no-UV, no-UV & blue light, full-blocked, and no film—on the physicochemical properties, lignin structure, and humification during wheat straw composting. Results showed that all light treatments except the full-blocked one promoted lignin degradation and humus accumulation. Notably, no-UV-B radiation exhibited the most pronounced effect, significantly enhancing side-chain oxidation and demethylation of lignin, and reducing the contents of cellulose, hemicellulose, and lignin by 43%, 43%, and 51%, respectively. Analyses using Structural Equation Modeling (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) indicated that the observed enhancement in lignocellulose degradation was primarily associated with oxidative pathways, while the promoted humification was largely linked to the phenol–protein pathway. Consequently, composting under no-UV-B radiation achieved optimal physicochemical properties within just 30 days. This study provides a crucial theoretical foundation and technical reference for the efficient and large-scale conversion of agricultural waste through photodegradation-assisted composting.