This study investigated the application risk and value of Cd-enriched poplar wood, focusing on its wood properties, leaching characteristics, and brown rot resistance. The results indicated that Cd deposition in cell walls significantly inhibited brown rot fungi, thereby enhancing decay resistance. Furthermore, the extent of improvement in brown rot resistance was linked to wood density: the higher the density of Cd-enriched poplar wood, the stronger its resistance to brown rot. As the Cd concentration increased, the Cd distribution abundance and the wood crystallinity gradually increased. Structural changes were observed, including fluctuating microfibril angle and double wall thickness of fibers and vessels. Cd concentrations exceeding 50 mg/kg altered the chemical composition of the cell walls. The binding form of Cd in wood cell wall showed a trend of bound Cd ＞ free Cd ＞ residual Cd. Cd leaching occurred under cyclic soaking in water, which may lead to secondary contamination. However, under the condition of 75 % relative humidity, Cd leaching was negligible, suggesting potential for safer use in controlled environments. These findings provide valuable insights into the management and application of Cd-enriched wood, especially in contexts where decay resistance is critical or in water-exposed environments.

中文翻译：

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富镉杨木的应用风险与价值：木材特性、浸出特性和抗褐腐性


本研究调查了富镉杨木的应用风险和价值，重点关注其木材特性、浸出特性和抗褐腐性。结果表明，Cd 在细胞壁中的沉积显著抑制了褐腐菌，从而增强了抗腐性。此外，抗褐腐病能力的提高程度与木材密度有关：富含 Cd 的杨木密度越高，其对褐腐病的抵抗力就越强。随着 Cd 浓度的增加，Cd 分布丰度和木材结晶度逐渐增加。观察到结构变化，包括微纤丝角波动和纤维和血管的双壁厚度。Cd 浓度超过 50 mg/kg 会改变细胞壁的化学成分。Cd 在木细胞壁中的结合形式表现出 Cd >游离 Cd >残留 Cd 结合的趋势，在水中循环浸泡时发生 Cd 浸出，可能导致二次污染。然而，在 75% 相对湿度的条件下，镉浸出可以忽略不计，这表明在受控环境中可以更安全地使用。这些发现为富镉木材的管理和应用提供了有价值的见解，尤其是在抗腐性至关重要的环境中或暴露在水中的环境中。