Wang Ruidong, Meng Zhongju, Gao Yong
College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot, China.
Front Plant Sci. 2024 Oct 7;15:1470347. doi: 10.3389/fpls.2024.1470347. eCollection 2024.
The implementation of sand barriers measures constitutes a crucial element in desertification control, providing a solid theoretical foundation for the future application and pretreatment of sand barriers in production practices. To address the specific damage types predominant in desert environments, we executed simulations of ultraviolet irradiation and rainfall phenomena on mechanical sand barriers in sandy areas and also inspected the variations in chemical properties during accelerated aging processes. The findings unequivocally demonstrate that: (1) The synergistic impact of ultraviolet irradiation and water accelerated the deformation and fracturing of the sand barriers, thereby causing a partial degradation of its chemical properties and conspicuous lignin oxidation; (2) The fissure of the sand barrier deepened, resulting in structural alterations. The existence of water expedites the degradation process of sand barriers under ultraviolet irradiation. (3)With respect to the binding form of C atoms, the carbon atoms at sand barriers were highly oxidized after 576 hours of accelerated aging. The components of C2 (C-O) and C3 (C=O) rising to 40.16% and 12.24% respectively, while the components of C1 (C-C) declined to 47.60%. The amount of hydroxyl (O-C-O), carbonyl (C=O), and carboxyl (O-C=O) groups increases in line with the expansion of the contact area between the sand barrier structure and ultraviolet irradiation as well as water. More free radical substances are generated, thereby causing the chemical binding properties to tend to be more stable. In summary, Ultraviolet irradiation and water change are the primary factors influencing the degradation of a sand barriers material structure and properties. In future desertification control, it is imperative to focus on enhancing the longevity of sand barriers by ensuring their waterproofing capabilities and resistance to ultraviolet irradiation.
沙障措施的实施是荒漠化治理的关键要素，为沙障在生产实践中的未来应用和预处理提供了坚实的理论基础。为应对沙漠环境中主要的特定破坏类型，我们对沙质地区机械沙障进行了紫外线照射和降雨现象的模拟，并考察了加速老化过程中化学性质的变化。研究结果明确表明：（1）紫外线照射和水的协同作用加速了沙障的变形和破裂，从而导致其化学性质部分降解以及明显的木质素氧化；（2）沙障的裂缝加深，导致结构改变。水的存在加速了紫外线照射下沙障的降解过程。（3）关于C原子的结合形式，加速老化576小时后，沙障处的碳原子被高度氧化。C2（C-O）和C3（C=O）的组分分别升至40.16%和12.24%，而C1（C-C）的组分降至47.60%。随着沙障结构与紫外线照射以及水之间接触面积的扩大，羟基（O-C-O）、羰基（C=O）和羧基（O-C=O）的数量增加。产生了更多的自由基物质，从而使化学结合性质趋于更稳定。综上所述，紫外线照射和水的变化是影响沙障材料结构和性能降解的主要因素。在未来的荒漠化治理中，必须注重通过确保沙障的防水能力和抗紫外线照射能力来提高其使用寿命。
