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| Remediation effect of continuous application of modified biochar on cadmium- and lead-contaminated soil and its effect on microbial community structure |
| Received:December 01, 2021 |
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| KeyWord:calcareous soil;soil heavy metals;microbial diversity;high-throughput sequencing |
| Author Name | Affiliation | E-mail | | YANG Suqin | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | WEI Sen | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | ZHANG Biao | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | zhangbiao6136@163.com | | LI Xuanzhen | College of Forestry, Henan Agricultural University, Zhengzhou 450002, China | | | ZHANG Yupeng | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | MA Zhenhua | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | NING Xinjie | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | | | WEI Hongyang | College of Resources and Environment, Henan Agricultural University, Zhengzhou 450002, China | |
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| Abstract: |
| In order to explore the stabilization effect of phosphoric acid-modified biochar on heavy metals in calcareous contaminated soil and the effect on microbial community structure, a 5-year trial was conducted in northern Henan Province from 2015 to 2019. In this study, phosphoric acid-modified rice husk biochar was selected as a soil modifier, and its continuous application during different years was conducted to analyze cadmium and lead contents in wheat grains and to explore the sustainability of its effect. Additionally, soil microbial diversity was also measured by high-throughput sequencing technology. The results showed that phosphoric acid-modified rice husk biochar used in this study reduced the pH of the calcareous soil to a certain extent. Available cadmium and lead contents in the soil were significantly reduced. Application of the soil modifier in different years could inhibit the accumulation of cadmium and lead in wheat grains. Compared to treatments without adding soil modifier, all treatments reduced the available soil cadmium and lead contents by 32%~46% and 24%~36%, respectively. Cadmium and lead contents in wheat grains decreased by 17%~43% and 9%~35%, respectively. In addition, the soil modifier significantly increased the abundance of Pseudolabrys and Nordella bacteria and Mortierella fungi, but decreased the abundance of Nocardioides and Bryobacter bacteria and Gibberella and Sarocladium fungi. It was observed that cadmium content in wheat grains reached the lowest level after continuous application of the soil modifier for 5 years, while lead content in wheat grains could be significantly reduced after application for 3 years. The application of a soil modifier had a certain impact on the soil microbial community structure and improved the diversity and richness of the soil bacterial community. |
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