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<p>Wood exposed to outdoor environments undergoes cyclical photodegradation and biological decay. This study investigated the alternating effects of accelerated ultraviolet (UV) weathering and brown-rot decay (<i>Gloeophyllum trabeum</i>) on southern pine (<i>Pinus</i> spp.) wood over two exposure cycles, focusing on the morphological, mass loss, porosity, wettability, chemical changes. Results showed that preceding photodegradation significantly impacted subsequent brown-rot degradation, transitioning from acceleration to inhibition in both cycles. This transition occurred earlier in the second cycle, linked to photodegradation-induced structural and chemical changes. Photodegradation increased wood porosity (61.1% in total pore volume, 27.5% in average pore size) and improved the surface wettability, providing fungal invasion pathways and moisture conducive for fungal growth. However, extended weathering accumulated antifungal lignin-derived compounds (e.g., quinones, phenols, aldehydes), inhibiting biodeterioration. Understandings this interaction aids in developing efficient protection strategies for outdoor wood products.</p>

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Influence of photodegradation on brown-rot fungi decay in Southern pine wood: a cyclical study

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Yujiao Wang,
  • Lingfeng Kong,
  • Yao Peng,
  • Jinzhen Cao

摘要

Wood exposed to outdoor environments undergoes cyclical photodegradation and biological decay. This study investigated the alternating effects of accelerated ultraviolet (UV) weathering and brown-rot decay (Gloeophyllum trabeum) on southern pine (Pinus spp.) wood over two exposure cycles, focusing on the morphological, mass loss, porosity, wettability, chemical changes. Results showed that preceding photodegradation significantly impacted subsequent brown-rot degradation, transitioning from acceleration to inhibition in both cycles. This transition occurred earlier in the second cycle, linked to photodegradation-induced structural and chemical changes. Photodegradation increased wood porosity (61.1% in total pore volume, 27.5% in average pore size) and improved the surface wettability, providing fungal invasion pathways and moisture conducive for fungal growth. However, extended weathering accumulated antifungal lignin-derived compounds (e.g., quinones, phenols, aldehydes), inhibiting biodeterioration. Understandings this interaction aids in developing efficient protection strategies for outdoor wood products.