School of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China.
School of Materials Science and Engineering, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China.
J Hazard Mater. 2023 Aug 15;456:131661. doi: 10.1016/j.jhazmat.2023.131661. Epub 2023 May 18.
The degradation process of different types of mulch in agriculture and its effect on soil ecosystem should be considered comprehensively. To this end, the changes in performance, structure, morphology, and composition of PBAT film during the degradation process were examined through a multiscale approach in comparison with several PE films and their effects on the soil physicochemical properties were investigated. At the macroscopic scale, the load and elongation of all films decreased with increasing ages and depths. At the microscopic scale, the stretching vibration peak intensity (SVPI) for PBAT and PE films decreased by 48.8 ∼ 60.2% and 9.3 ∼ 38.6%, respectively. The crystallinity index (CI) increased by 67.3 ∼ 209.6% and 15.6 ∼ 21.8%, respectively. At the molecules scale, terephthalic acid (TPA) was detected in localized soil with PBAT mulch after 180 d. In short, the degradation characteristics of PE films were depended on their thickness and density. The PBAT film exhibited the highest degree of degradation. Simultaneously, the soil physicochemical properties such as soil aggregates, microbial biomass and pH were affected by the changes of film structure and components during the degradation process. This work has practical implications for the sustainable development of agriculture.
农业中不同类型覆盖物的降解过程及其对土壤生态系统的影响应综合考虑。为此，通过多尺度方法研究了 PBAT 薄膜在降解过程中的性能、结构、形态和组成变化，并与几种 PE 薄膜进行了比较，同时研究了它们对土壤物理化学性质的影响。在宏观尺度上，所有薄膜的负荷和伸长率随年龄和深度的增加而降低。在微观尺度上，PBAT 和 PE 薄膜的伸缩振动峰强度（SVPI）分别降低了 48.8∼60.2%和 9.3∼38.6%。结晶度指数（CI）分别增加了 67.3∼209.6%和 15.6∼21.8%。在分子尺度上，在使用 PBAT 覆盖物 180 天后，局部土壤中检测到了对苯二甲酸（TPA）。总之，PE 薄膜的降解特性取决于其厚度和密度。PBAT 薄膜的降解程度最高。同时，在降解过程中，薄膜结构和成分的变化会影响土壤团聚体、微生物生物量和 pH 等土壤物理化学性质。这项工作对农业的可持续发展具有实际意义。
