Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol

文献类型： 外文期刊

第一作者： Chen, Miao

作者： Chen, Miao;Zhang, Wen;Chen, Xin;Liu, Huiran;Ning, Ziyu;Fan, Changhua;Wu, Dongming;Li, Qinfen;Chen, Miao;Zhang, Wen;Chen, Xin;Ning, Ziyu;Fan, Changhua;Wu, Dongming;Li, Qinfen;Peng, Licheng;Cao, Ming;Zhang, Meng;Wu, Dongming

作者机构：

关键词： Particulate organic matter; Mineral-associated organic matter; Carbon and nitrogen cycling; Microbial community; Enzyme activity

期刊名称：ENVIRONMENT INTERNATIONAL （ 影响因子：11.8； 五年影响因子：12.4 ）

ISSN： 0160-4120

年卷期： 2024 年 183 卷

页码：

收录情况： SCI

摘要： Microplastics (MPs) pollution is becoming an emerging global stressor for soil ecosystems. However, studies on the impacts of biodegradable MPs on soil C sequestration have been mainly based on bulk C quantity, without considering the storage form of C, its persistency and N demand. To address this issue, the common poly (butylene adipate-co-terephthalate) (PBAT) was used as the model, and its effects on soil functional organic pools, including mineral -associated (MAOM), particulate (POM) and dissolved organic matter (DOM), were investigated from the novel coupled perspective of C and N stocks. After adding PBAT-MPs, the contents of soil POM-C, DOM-C, and MAOM-C were increased by 546.9 %-697.8 %, 54.2 %-90.3 %, and 13.7 %-18.9 %, respectively. Accordingly, the total C increased by 116.0 %-191.1 %. Structural equation modeling showed that soil C pools were regulated by PBAT input and microbial metabolism associated with C and N enzymes. Specifically, PBAT debris could be disguised as soil C to promote POM formation, which was the main pathway for C accumulation. Inversely, the MAOM-C and DOM-C formation was attributed to the PBAT microbial product and the selective consumption in DOM-N. Random forest model confirmed that N -activated (e.g., Nitrospirae) and PBAT-degrading bacteria (e.g., Gemmatinadetes) were important taxa for soil C accumulation, and the key enzymes were rhizopus oryzae lipas, invertase, and ammonia monooxygenase. The soil N accumulation was mainly related to the oligotrophic taxa (e.g., Chloroflexi and Ascomycota) associated with aggregate formation, decreasing the DOM-N by 46.9 %-84.3 %, but did not significantly change the total N storage and other N pools. Collectively, the findings highlight the urgency to control the nutrient imbalance risk of labile N loss and recalcitrant C enrichment in POM to avoid the depressed turnover rate of organic matter in MPs -polluted soil.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序