College of Forestry, Beijing Forestry University, Beijing 100083, PR China.
College of Forestry, Beijing Forestry University, Beijing 100083, PR China.
Sci Total Environ. 2024 Apr 10;920:171021. doi: 10.1016/j.scitotenv.2024.171021. Epub 2024 Feb 17.
Light radiation can degrade recalcitrant materials like lignocelluloses in litter and serve as a physical condition to accelerate green waste (GW) decomposition, but few studies have considered the microbial effects of light wavelength on GW composting. This study innovatively investigated the effects of different wavelengths of light radiation, including full-spectrum, no blue light, no UV, no UV-A, no UV-B, and dark conditions, on accelerating the GW composting process. Especially, the study explored the dynamic changes in the degradation of lignocelluloses and evaluated the responses of microorganisms throughout the composting process under different light radiation wavelengths. No blue light (where radiation between 400 and 500 nm was blocked by the film) yielded the highest-quality compost within 40 days. In comparison to the dark (control), no blue light exhibited an elevated composting temperature (56.7 °C), an extended thermophilic phase (6 days), and increased degradation rates of lignin, cellulose, and hemicellulose by 13 %, 15 %, and 12 %, respectively. This study revealed that during the composting mesophilic phase, bacterial diversity performed best under no blue light, while fungal diversity excelled under full-spectrum. In the thermophilic phase, microbial diversity exhibited optimal performance under full-spectrum. During the cooling phase, bacterial diversity was highest under no blue light, and fungal diversity excelled under no UV-A. During the mesophilic and cooling phases, the bacterial ACE index for no blue light exceeded that of the other light radiation wavelengths, with values of 418 and 494, respectively. Under no blue light, the Shannon index of microorganisms remained within the range of 2.0-4.8, demonstrating superior performance. Meanwhile, the relative abundances of lignin-degrading microorganisms (Flavobacterium, Acaulium, and Acremoniu) under no blue light has increased, demonstrating improved microbial community structures. Therefore, no blue light radiation offered a novel approach to expedite GW composting.
光辐射可以降解枯枝落叶等木质纤维素等难降解物质，并作为一种物理条件来加速绿色废弃物（GW）的分解，但很少有研究考虑光波长对 GW 堆肥中微生物的影响。本研究创新性地研究了不同波长的光辐射，包括全光谱、无蓝光、无紫外线、无 UV-A、无 UV-B 和黑暗条件，对加速 GW 堆肥过程的影响。特别是，该研究探索了木质纤维素降解的动态变化，并评估了在不同光辐射波长下堆肥过程中微生物的响应。无蓝光（通过薄膜阻挡 400 至 500nm 之间的辐射）在 40 天内产生了质量最好的堆肥。与黑暗（对照）相比，无蓝光表现出更高的堆肥温度（56.7°C），更长的高温期（6 天），以及木质素、纤维素和半纤维素的降解率分别提高了 13%、15%和 12%。本研究表明，在堆肥中温阶段，无蓝光下细菌多样性表现最佳，而全光谱下真菌多样性表现最佳。在高温阶段，微生物多样性在全光谱下表现出最佳性能。在冷却阶段，无蓝光下细菌多样性最高，无 UV-A 下真菌多样性最高。在中温阶段和冷却阶段，无蓝光下的细菌 ACE 指数高于其他光辐射波长，分别为 418 和 494。在无蓝光下，微生物的 Shannon 指数保持在 2.0-4.8 之间，表现出优异的性能。同时，无蓝光下木质素降解微生物（黄杆菌、无梗束丝菌和节杆菌）的相对丰度增加，表明微生物群落结构得到改善。因此，无蓝光辐射为加速 GW 堆肥提供了一种新方法。
