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| Passivation of Pb （Ⅱ）in soil and promoting cucumber growth using functional microbial agents |
| Received:November 27, 2022 Revised:April 04, 2023 |
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| KeyWord:phosphate-solubilizing bacteria;bone char;FeS;carboxymethyl cellulose（CMC）;Pb;soil;biomineralization |
| Author Name | Affiliation | E-mail | | ZHANG Lin | Northeast Agricultural University, Harbin 150010, China | | | WEI Shuqi | Northeast Agricultural University, Harbin 150010, China | | | BI Fuxuan | Northeast Agricultural University, Harbin 150010, China | | | REN Zheyi | Northeast Agricultural University, Harbin 150010, China | | | CAO Bo | Northeast Agricultural University, Harbin 150010, China | | | ZHANG Ying | Northeast Agricultural University, Harbin 150010, China | | | QU Jianhua | Northeast Agricultural University, Harbin 150010, China | jhqu@neau.edu.cn |
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| Abstract: |
| To solve the problem of poor activity and low remediation efficiency of phosphorus solubilizing bacteria (PSB) in environments with severe Pb pollution, bone char was used to load ferrous sulfide (FeS) with the stabilization of carboxymethyl cellulose(CMC). This was coupled with PSB for synthesizing the functionalized bacteria agent (CFB1-P). CFB1-P was applied for the remediation of Pb contaminated soil, and the performance and mechanisms of alleviating Pb stress in cucumber were investigated. The results showed that CFB1-P possessed high adsorption performance for Pb(Ⅱ), with the maximum adsorption capacity of Pb (Ⅱ) being 452.99 mg·g-1 through chemical precipitation, complexation, electrostatic attraction, and biological mineralization. Furthermore, phosphate-solubilizing amount of PSB in CFB1-P was enhanced to 140 mg · L-1. In comparison with CK, application of CFB1-P in the soil could effectively reduce the bioavailability of Pb and decrease the bioaccumulation of Pb in the shoots and roots of cucumber seedlings from 63.84 and 15.96 mg·kg-1 to 5.59 and 1.39 mg·kg-1, successful alleviating the toxicity stress of Pb on cucumber seedlings. Meanwhile, addition of CFB1-P to the soil significantly increased the plant height, root length, and fresh weight of cucumber seedlings from 6.1 cm·plant-1, 1.2 cm·plant-1, and 0.87 g · plant-1 to 12.7 cm · plant-1, 4.1 cm · plant-1, and 6.52 g · plant-1, effective promoting the growth of cucumber seedlings. The study demonstrates that CFB1-P has excellent passivation properties for Pb, and can be considered as an efficient potential remediation agent for Pb contaminated soil. |
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