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| Degradation characteristics of PBAT-based mulch film in soil and its influence on microbial community structure |
| Received:March 04, 2025 |
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| KeyWord:biodegradable mulch;polybutylene adipate /terephthalate（PBAT）;polylactic acid（PLA）;polycarbonate（PPC）;degradation characterization;soil microbial community |
| Author Name | Affiliation | E-mail | | XIE Changhong | Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Ministry of Agriculture and Rural Affairs, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WANG Yue | Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Ministry of Agriculture and Rural Affairs, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LIU Qi | Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Ministry of Agriculture and Rural Affairs, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | liuqi@caas.cn | | TANG Qiuxiang | College of Agriculture, Xinjiang Agricultural University, Urumqi 830052, China | | | CUI Jixiao | Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Ministry of Agriculture and Rural Affairs, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | BAI Runhao | Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Ministry of Agriculture and Rural Affairs, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | HE Wenqing | AgroEnvironmental Protection Institute, Ministry of Agriculture and Rural Afairs, Tianjing 300191, China | hewenqing@caas.cn |
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| Abstract: |
| To investigate the degradation characteristics and microbial mechanisms of biodegradable mulch films in soil environments, a 300-day soil incubation experiment was conducted in this study. Cavity ring-down spectroscopy（CRDS）, proton nuclear magnetic resonance（1H NMR）, gel permeation chromatography（GPC）, and scanning electron microscopy（SEM）were employed to analyze and compare the degradation characteristics of three mulch films（PBAT, PBAT/PLA, and PBAT/PPC）and their effects on soil microbial community structure. The results showed that the degradation rate of PBAT mulch film was significantly higher than that of PBAT/PLA and PBAT/PPC films. After 300 days, the mineralization rate of PBAT reached 30.7%, while those of PBAT/PLA and PBAT/PPC were only 15.3% and 12.4%, respectively, indicating that the addition of PLA and PPC significantly slowed down the degradation rate. 1H NMR analysis revealed that in PBAT films, the degradation rate of aliphatic structural units in PBAT mulch film was faster than that of aromatic structural units. In contrast, in PBAT/PLA and PBAT/PPC films, the degradation rates of PLA and PPC components were higher than those of PBAT. During degradation, different mulch film treatments significantly altered the soil microbial community structure, with specific taxa such as Paludisphaera and Sporosarcina showing marked enrichment during degradation. Correlation analysis demonstrated that microbial taxa such as Sporosarcina, Limnoglobus, and Skermanella were closely associated with the degradation rate of the mulch films. Neutral community model analysis further revealed that the assembly mechanisms of microbial communities dynamically shifted across degradation stages: stochastic processes dominated in the initial and late phases, while deterministic factors（such as mulch film type and degradation products）played a major role in the middle phase. This study demonstrates that PLA and PPC can regulate PBAT degradation rates through microfiber formation, and microbial community dynamics are closely linked to the degradation of material components. |
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