Struvite-supported biochar composite effectively lowers Cu bio-availability and the abundance of antibiotic-resistance genes in soil.,Science of the Total Environment

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Struvite-supported biochar composite effectively lowers Cu bio-availability and the abundance of antibiotic-resistance genes in soil.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-03-28 , DOI: 10.1016/j.scitotenv.2020.138294
Yuan Li ₁ , Xuejiang Wang ₁ , Yuan Wang ₁ , Fei Wang ₁ , Siqing Xia ₁ , Jianfu Zhao ₁

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The accumulation of heavy metals and the accelerated dissemination of antibiotic-resistance genes (ARGs) in soil receiving long-term manure application are causing worldwide concern. In this study, struvite-supported biochar composite (MAP/BC) obtained by N and P recovery from pig slurry with Mg(OH)2-modified biochar (Mg(OH)2/BC) was used as a novel amendment for the remediation of Cu- and ARG-contaminated agricultural soil. The effects of MAP/BC on Cu immobilization, ARG distribution, and the bacterial community in the soil were investigated simultaneously. The results showed that the mechanisms involved in the immobilization of Cu by MAP/BC included the formation of copper-phosphate precipitation and a surface complex. With a 10% MAP/BC modification, the acid-soluble Cu content in soil decreased by 0.47-fold at day 56 while the residual Cu content increased 1.41-fold. Meanwhile, the abundances of most of the target ARGs (tetX, tetT, tetW, tetG, ermB, sulI, sulII, and intlI) were reduced by 11.35-99.95%, and the abundance of total ARGs was reduced by 30.69%. The redundancy analysis indicated that the bio-available Cu content played a crucial role in the variations of both ARGs and bacterial communities. The network analysis further suggested that potential hosts of soil ARGs were mainly Firmicutes and Actinobacteria. The above results suggested that the application of MAP/BC can mitigate Cu and ARG pollution in manured soil.

中文翻译：

鸟粪石支持的生物炭复合材料可有效降低土壤中的铜生物利用度和抗生素抗性基因的丰度。

在长期施用肥料的土壤中，重金属的积累和抗生素抗性基因（ARG）的加速传播引起了全世界的关注。在这项研究中，鸟粪石负载的生物炭复合物（MAP / BC）是通过用Mg（OH）2改性的生物炭（Mg（OH）2 / BC）从猪粪中进行N和P回收而获得的，作为一种新的修复方法被铜和ARG污染的农业土壤。同时研究了MAP / BC对土壤中Cu固定化，ARG分布和细菌群落的影响。结果表明，MAP / BC固定Cu的机理包括形成磷酸铜沉淀和表面配合物。通过MAP / BC 10％的改性，土壤中酸溶性Cu的含量降低了0。在第56天时47倍，而残余铜含量增加1.41倍。同时，大多数目标ARG（tetX，tetT，tetW，tetG，ermB，sulI，sulII和intlI）的丰度降低了11.35-99.95％，总ARG的丰度降低了30.69％。冗余分析表明，可利用的铜含量在ARGs和细菌群落的变化中起着至关重要的作用。网络分析进一步表明，土壤ARGs的潜在宿主主要是Firmicutes和放线菌。以上结果表明，MAP / BC的应用可以减轻粪肥土壤中Cu和ARG的污染。冗余分析表明，可利用的铜含量在ARGs和细菌群落的变化中起着至关重要的作用。网络分析进一步表明，土壤ARGs的潜在宿主主要是Firmicutes和放线菌。以上结果表明，MAP / BC的应用可以减轻粪肥土壤中Cu和ARG的污染。冗余分析表明，可利用的铜含量在ARGs和细菌群落的变化中起着至关重要的作用。网络分析进一步表明，土壤ARGs的潜在宿主主要是Firmicutes和放线菌。以上结果表明，MAP / BC的应用可以减轻粪肥土壤中Cu和ARG的污染。

更新日期：2020-03-28

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