Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol
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...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Environment International |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0160412023006669 |
| _version_ | 1797349442263711744 |
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| author | Miao Chen Ming Cao Wen Zhang Xin Chen Huiran Liu Ziyu Ning Licheng Peng Changhua Fan Dongming Wu Meng Zhang Qinfen Li |
| author_facet | Miao Chen Ming Cao Wen Zhang Xin Chen Huiran Liu Ziyu Ning Licheng Peng Changhua Fan Dongming Wu Meng Zhang Qinfen Li |
| author_sort | Miao Chen |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-08T12:30:18Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 0160-4120 |
| language | English |
| last_indexed | 2024-03-08T12:30:18Z |
| publishDate | 2024-01-01 |
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| series | Environment International |
| spelling | doaj.art-7f393ff7fbb742578ad36805ccbc68302024-01-22T04:15:31ZengElsevierEnvironment International0160-41202024-01-01183108393Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosolMiao Chen0Ming Cao1Wen Zhang2Xin Chen3Huiran Liu4Ziyu Ning5Licheng Peng6Changhua Fan7Dongming Wu8Meng Zhang9Qinfen Li10Key Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, ChinaAgro-Tech Extension and Service Center of Sanya, Sanya 572000, Hainan, ChinaKey Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, ChinaKey Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, ChinaKey Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, ChinaKey Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, ChinaSchool of Ecology and Environment, Hainan University, Haikou 570228, ChinaKey Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, ChinaKey Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, China; Corresponding author at: No. 4 Xueyuan Road, Longhua District, Haikou, Hainan 571101, China.School of Electronic and Information Engineering, Beihang University, Beijing 100191, ChinaKey Laboratory of Low-carbon Green Agriculture in Tropical Region of China, Ministry of Agriculture and Rural Affairs, Hainan Key Laboratory of Tropical Eco-Circuling Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, ChinaMicroplastics (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.http://www.sciencedirect.com/science/article/pii/S0160412023006669Particulate organic matterMineral-associated organic matterCarbon and nitrogen cyclingMicrobial communityEnzyme activity |
| spellingShingle | Miao Chen Ming Cao Wen Zhang Xin Chen Huiran Liu Ziyu Ning Licheng Peng Changhua Fan Dongming Wu Meng Zhang Qinfen Li Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol Environment International Particulate organic matter Mineral-associated organic matter Carbon and nitrogen cycling Microbial community Enzyme activity |
| title | Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol |
| title_full | Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol |
| title_fullStr | Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol |
| title_full_unstemmed | Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol |
| title_short | Effect of biodegradable PBAT microplastics on the C and N accumulation of functional organic pools in tropical latosol |
| title_sort | effect of biodegradable pbat microplastics on the c and n accumulation of functional organic pools in tropical latosol |
| topic | Particulate organic matter Mineral-associated organic matter Carbon and nitrogen cycling Microbial community Enzyme activity |
| url | http://www.sciencedirect.com/science/article/pii/S0160412023006669 |
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