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
作者： Chen, Miao 1 ; Cao, Ming 4 ; Zhang, Wen 1 ; Chen, Xin 1 ; Liu, Huiran 1 ; Ning, Ziyu 1 ; Peng, Licheng 3 ; Fan, Changhua 1 ; Wu, Dongming 1 ; Zhang, Meng 5 ; Li, Qinfen 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Low carbon Green Agr Trop Reg China, Hainan Key Lab Trop Ecocircular Agr,Minist Agr & R, Haikou 571101, Peoples R China
2.Hainan Danzhou Trop Agroecosyst Natl Observat & Re, Danzhou 571737, Peoples R China
3.Hainan Univ, Sch Ecol & Environm, Haikou 570228, Hainan, Peoples R China
4.Agrotech Extens & Serv Ctr Sanya, Sanya 572000, Hainan, Peoples R China
5.Beihang Univ, Sch Elect & Informat Engn, Beijing 100191, Peoples R China
6.4 Xueyue Rd, Haikou 571101, Hainan, Peoples R China
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.
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