Salix psammophila has been extensively used as a sand barrier material for various desertification control applications over the years. Thus, elucidating the long-term degradation processes of this sand barrier in desert environments is of great importance. In this study, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and chemometric methods were used to evaluate and compare the structure and performance of the S. psammophila sand barrier during degradation. The results clearly showed that the structure and performance of the S. psammophila sand barrier varied in the different vertical sections of the barrier. With the increase in the setting period of the sand barriers, the atmospheric exposure section (AES) and stable sand buried section (SSBS) exhibited deterioration and decay, respectively. The mass loss rate was SSBS>AES>ASDI, which also exhibited different degrees of decrease in mechanical properties such as in the modulus of rupture, ultimately resulting in lodging, damage, and the loss of the function of the S. psammophila sand barrier in preventing wind–sand movement and fixing quicksand. Microstructural changes showed that after eight years of setting, the vessel and parenchyma cells were severely damaged and the corresponding chemical components, such as cellulose, hemicellulose, and lignin, were degraded to a certain extent. The decrease in the crystallinity index values based on the XRD analysis confirmed the deterioration and obvious changes in the crystallinity, which affected the strength of the S. psammophila sand barrier. The FT-IR analysis indicated that several characteristic peaks of cellulose, hemicellulose, and lignin in the AES and SSBS sections disappeared or were weakened compared with the ASDI section. Comprehensive analysis showed that the primary reason for the serious deterioration in AES was the aging caused by exposure to continuous UV radiation in the atmospheric environment, while the serious decay of SSBS was mainly caused by microbial and fungal activity in the sandy environment, ultimately leading to the degradation of the S. psammophila sand barrier. Our findings suggest that it is necessary to further strengthen the anti-aging and anti-corrosion measures in the resource utilization process of the S. psammophila sand barrier in the future.

多年来，沙柳（Salix psammophila）已被广泛用作各种防沙治沙应用的防砂材料。因此，阐明这种沙障在沙漠环境中的长期降解过程非常重要。在这项研究中，使用傅里叶变换红外光谱（FT-IR），X射线衍射（XRD），扫描电子显微镜（SEM）和化学计量学方法评估和比较了沙门氏菌沙障在结构过程中的结构和性能。降解。结果清楚地表明，沙门氏菌的结构和性能砂屏障在屏障的不同垂直部分中变化。随着防沙层凝结时间的增加，大气暴露区（AES）和稳定的沙埋区（SSBS）分别呈现出劣化和衰减。质量损失率是SSBS> AES> ASDI，它也表现出不同程度的机械性能下降，例如断裂模量，最终导致倒伏，破坏和沙门氏菌功能丧失。防风沙运动和固定流沙的防沙层。微观结构变化表明，放置八年后，血管和实质细胞受到严重破坏，相应的化学成分（如纤维素，半纤维素和木质素）在一定程度上降解。基于XRD分析的结晶度指数值的降低证实了结晶度的劣化和明显变化，这影响了嗜肺链球菌的强度。防沙层。FT-IR分析表明，与ASDI部分相比，AES和SSBS部分中纤维素，半纤维素和木质素的几个特征峰消失或减弱。综合分析表明，AES严重恶化的主要原因是大气环境中暴露于连续紫外线辐射导致的老化，而SSBS的严重衰变主要是由沙质环境中的微生物和真菌活动引起的，最终导致沙门氏菌沙壁屏障的降解。我们的发现表明，未来在沙门氏菌沙障的资源利用过程中，有必要进一步加强抗老化和防腐措施。