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Addition of biodegradable microplastics alters the quantity and chemodiversity of dissolved organic matter in latosol

文献类型： 外文期刊

作者： Chen, Miao 1 ; Zhao, Xiongwei 1 ; Wu, Dongming 2 ; Peng, Licheng 1 ; Fan, Changhua 2 ; Zhang, Wen 2 ; Li, Qinfen 2 ; Ge, Chengjun 1 ;

作者机构： 1.Hainan Univ, Coll Ecol & Environm, 58 Renmin Rd, Haikou 570228, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Hainan Key Lab Trop Ecocircular Agr, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China

3.Hainan Danshou Trop Agroecosyst Natl Observat & R, Danahou 571737, Peoples R China

关键词： Microplastic pollution; DOM Chemodiversity; Carbon metabolism; Multispectroscopic techniques; Exoenzyme activity; Priming effect

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 816 卷

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) chemodiversity plays an important role in regulating nutrient cycles and contaminant behavior in soil. However, how biodegradable microplastic (MPs) affect the DOM chemodiversity is still unknown, although developing biodegradable plastics are regarded as a promising strategy to minimize the risks of MPs residues in soil. Here, with the common poly (butylene adipate-co-terephthalate) (PBAT) as the model, the molecular effect of biodegradable MPs on soil DOM was explored by adding 0%, 5% and 10% (w/w) of PBAT to tropical latosol, respectively. The results showed that PBAT addition increased microbial activity and exoenzyme activity (e.g., rhizopus oryzae lipase, invertase and cellulose). As a result, the quantity and chemodiversity of soil DOM were changed. The multispectroscopic characterization showed that PBAT addition significantly increased the DOC molecules in soil, including condensed aromatic-like substances and carbohydrates. In contrast, the TDN molecules with high bioavailability and low aromaticity, such as amino acids, were decreased. The multivariate statistical analysis indicated that there were three mechanisms that drove the shift in DOM chemodiversity. Firstly, the degradation of PBAT by rhizopus oryzae lipase facilitated the release of exogenous aromatic molecules. Secondly, PBAT decomposition stimulated the selective consumption of native N-rich molecules by soil microbes. Thirdly, PBAT accelerated the enzymatic transformation of native aliphatic CHx and cellulose toward humic substances. In addition, concentration effect was also observed in the study that high-concentration PBAT were more likely to trigger the molecular shift in DOM chemodiversity. These findings provided a new insight into the impact of biodegradable MPs on soil DOM chemodiversity at molecular level, which will be beneficial to understanding the fate and biochemical reactivity of DOM in MPs-polluted soil.

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