The preferential preservation of both different minerals and polyethylene microplastics on aromatic or aliphatic carbon fractions within low or high pyrolysis temperature biochar under mineralization
The preferential preservation of both different minerals and polyethylene microplastics on aromatic or aliphatic carbon fractions within low or high pyrolysis temperature biochar under mineralization
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DOI：
10.1016/j.rser.2022.112963
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发表时间：
2022-12
影响因子：
15.9
通讯作者：
Jie Liu;Z. Pan;Ke Sun;Yalan Chen;Yan Yang;Bo Gao;B. Xing
中科院分区：
文献类型：
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作者：
Jie Liu;Z. Pan;Ke Sun;Yalan Chen;Yan Yang;Bo Gao;B. Xing
土壤矿物质和微塑料对生物炭（BC）稳定性的影响尚未明确。本文研究了低温和高温条件下产生的炭（L-BC和H-BC）及其分别由石英、蒙皂石和高岭石组成的人工土壤的矿化作用。通过对BC和BC人工土壤在添加和不添加聚乙烯（PE）条件下培养180 d后的CO2排放、分子组成和微生物群落结构的研究，分析了BC和BC人工土壤的CO2排放特征。矿物，特别是石英，对H-BC的保护作用相对大于L-BC。蒙脱石保护了L-BC的脂肪碳，高岭石保护了L-BC的芳香碳和脂肪碳。蒙脱石和高岭石可能具有相当的保护BC的能力。石英通过吸附疏水性芳香碳来保护H-BC中的芳香碳。矿物质还导致优势菌从r-策略者向K-策略者转变，从而减缓了活性碳的降解，减少了CO2的排放。PE降低了L-BC及其人工土壤的CO2排放量，而H-BC则相反。PE提高了H-BC人工土壤中与矿物结合的芳香碳含量，抑制了H-BC的矿化。真菌（曲霉属）对PE的降解可能是H-BC人工土壤CO2排放量增加的主要原因。本研究揭示了矿物和PE在BC矿化过程中的不同作用，为阐明BC在土壤中的稳定机制提供了依据，有助于BC固碳政策的制定。
The effects of soil minerals and microplastics on the stability of biochar (BC) have not been clearly clarified. Here, the mineralization of BC produced at low and high temperatures (L-BC and H-BC) and their artificial soils made of quartz, smectite and kaolinite, respectively, was investigated. BC and BC artificial soils were incubated with or without polyethylene (PE) over 180 d, and the CO2emission, molecular composition and microbial community structure were assessed. Minerals, especially quartz, had relatively more protection to H-BC than to L-BC. Moreover, smectite preserved aliphatic C of L-BC, and kaolinite protected its aromatic C and aliphatic C. Smectite and kaolinite likely had comparable ability to protect BCs. Quartz protected the aromatic C of H–BCs by adsorbing the hydrophobic aromatic C. Minerals also led to the shift of the dominant bacteria from r-strategists to K-strategists, which alleviated degradation of labile carbon and reduced the CO2emissions. PE decreased the CO2emissions of L-BC as well as its artificial soils and the opposite effect was observed for H-BC. PE enhanced the aromatic C associated with minerals within H-BC artificial soils, and inhibited the mineralization of H-BC. PE degradation by fungi (Aspergillus) could be largely responsible for the rise in CO2emissions of H-BC artificial soils. This study addressed the different effect of minerals and PE in the process of BC mineralization and provided the basis for elucidating the stability mechanism of BC in soil, which would be helpful for establishment of BC carbon sequestration policy.