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首页> 外文期刊>The Science of the Total Environment >Influence of biochars on the accessibility of organochlorine pesticides and microbial community in contaminated soils
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Influence of biochars on the accessibility of organochlorine pesticides and microbial community in contaminated soils

机译：生物炭对受污染土壤中有机氯农药和微生物群落可达性的影响

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Biochar can be used as a promising potential substance to reduce the availability of toxic elements and compounds in contaminated soils but its effects on the accessibility of pesticides and microbiological interactions still remain unclear. Here, 65 day incubation experiments were conducted to investigate the efficacy of biochars on the accessibility of 21 different organochlorine pesticides (OCPs), and also to evaluate their influence on soil microbial community. The tested soil was collected from an agricultural field, containing loamy sand texture, and historically contaminated with high concentrations of OCPs. The soil was amended with four different kinds of biochars: sewage sludge biochar (SSBC), peanut shells biochar (PNBC), rice straw biochar (RSBC), and soybean straw biochar (SBBC). The results indicated that biochar-amendments had strong effects upon OCP accessibility over time and can act as super sorbent. Despite greater persistence of OCPs in soil, the application of selected biochars significantly (p 0.01) reduced the accessibility of Sigma OCPs in the amended soil in the order of SSBC (8-69%), PNBC (11-75%), RSBC (6-67%), and SBBC (14-86%), as compared to the control soil during 0-65 d incubation period. Moreover, the findings from total phospholipid acid (PLFA) and Illumina next-generation sequencing revealed that the incorporation of biochar have altered the soil microbial community structure over time. Higher abundances of Proteobacteria, firmicutes, Gemmatimonadetes, and Actinobacteria were found in biochar amendments. However, the relative abundances of Acidobacteria and Chloroflexi decreased, following biochar addition. The findings of these experiments suggest that biochar addition to soil at the rate of 3% (w/w) could be advantageous for decreasing accessibility of OCPs, enhancing the soil microbial communities, and their subsequent risk to environment and food chain contamination.(C) 2018 Elsevier B.V. All rights reserved.
机译：生物炭可以用作减少污染土壤中有毒元素和化合物的潜力的有前途的潜在物质，但其对农药可及性和微生物相互作用的影响仍不清楚。在这里，进行了65天的孵育实验，以研究生物炭对21种不同有机氯农药（OCP）的可及性的功效，并评估其对土壤微生物群落的影响。所测试的土壤是从农田中收集的，土壤质地为壤土，历史上曾被高浓度的OCP污染。用四种生物炭对土壤进行了修正：污水污泥生物炭（SSBC），花生壳生物炭（PNBC），稻草生物炭（RSBC）和大豆秸秆生物炭（SBBC）。结果表明，随着时间的推移，生物炭改性剂对OCP的可及性具有很强的影响，并且可以作为超级吸附剂。尽管OCP在土壤中的持久性更高，但选择生物炭的施用仍显着（p <0.01）降低了改良后土壤中Sigma OCP的可及性，依次为SSBC（8-69％），PNBC（11-75％），RSBC （6-67％）和SBBC（14-86％），与0-65 d孵育期间的对照土壤相比。此外，总磷脂酸（PLFA）和Illumina下一代测序的发现表明，生物炭的掺入随着时间的推移改变了土壤微生物群落结构。在生物炭修正物中发现了更高含量的变形杆菌，硬毛菌，芽孢杆菌和放线菌。但是，添加生物炭后，嗜酸菌和绿弯曲菌的相对丰度降低。这些实验的发现表明，以3％（w / w）的比率向土壤中添加生物碳可能有利于降低OCP的可及性，增强土壤微生物群落及其对环境和食物链污染的后续风险。 ）2018 Elsevier BV保留所有权利。

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