Cupriavidus B-7 immobilized biochar: an effective solution for Cd accumulation alleviation and growth promotion in pakchoi (Brassica Chinensis L.)

IF 13.1 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Biochar Pub Date : 2024-05-09 DOI:10.1007/s42773-024-00333-2

Yefang Sun, Da Ouyang, Yiming Cai, Ting Guo, Mei Li, Xinlin Zhao, Qichun Zhang, Ruihuan Chen, Fangzhen Li, Xiujuan Wen, Lu Xie, Haibo Zhang

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Abstract

Cd contamination, especially in farmland soil, can pose serious threats to human health as well as ecological security. Stabilization is an important strategy for agricultural soil Cd remediation. In this study, a Cd-resistant strain (Cupriavidus B-7) was isolated and loaded onto cow manure (CDB), rice straw (RSB) and pine wood biochar (PB) to investigate its effects on Cd stabilization by a 60-day pot experiment. Results indicated that the Cupriavidus B-7-loaded biochar (labelled as CDBB, PBB and RSBB) reduced the CaCl₂-extractable Cd by 43.06–59.78%, which was significantly superior to individual applications of Cupriavidus B-7 and biochar. Likewise, the soil physicochemical properties, urease, catalase and phosphatase activities were improved, indicating improved soil health. Consequently, dry weights of pakchoi’s shoot and root were increased by 938.9–1230.9% and 149.1–281.2%, respectively, by applying CDBB, PBB and RSBB. Meanwhile, the Cd accumulation in pakchoi shoots decreased by 38.06–50.75%. Notably, the RSBB exhibited an optimal performance on pakchoi growth promotion and Cd accumulation alleviation. The structural equation model indicated the synergistic effect on pakchoi growth promotion and Cd accumulation decreased between biochar and Cupriavidus B-7. Our research provides some new insights into the development of strategies for green and sustainable remediation of Cd-contaminated soil.

Graphical Abstract

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固定化铜绿微囊藻 B-7：减轻镉积累和促进大白菜生长的有效解决方案

镉污染，尤其是农田土壤中的镉污染，会对人类健康和生态安全构成严重威胁。稳定化是农业土壤镉修复的重要策略。本研究分离了抗镉菌株（Cupriavidus B-7），并将其添加到牛粪（CDB）、稻草（RSB）和松木生物炭（PB）上，通过为期 60 天的盆栽实验研究其对镉稳定化的影响。结果表明，装载了Cupriavidus B-7的生物炭（标记为CDBB、PBB和RSBB）可将CaCl2提取的镉减少43.06-59.78%，明显优于单独施用Cupriavidus B-7和生物炭。同样，土壤理化性质、脲酶、过氧化氢酶和磷酸酶活性也得到了改善，表明土壤健康状况得到了改善。因此，施用 CDBB、PBB 和 RSBB 后，椿树嫩枝和根的干重分别增加了 938.9-1230.9% 和 149.1-281.2%。同时，镉在椿树嫩枝中的积累量减少了 38.06-50.75%。值得注意的是，RSBB 在促进椿树生长和减少镉积累方面表现最佳。结构方程模型表明，生物炭和铜绿微囊藻 B-7 对促进椿树生长和减少镉积累有协同作用。我们的研究为镉污染土壤绿色可持续修复策略的开发提供了一些新的见解。图文摘要

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来源期刊

Biochar Multiple-

CiteScore

18.60

自引率

10.20%

发文量

期刊介绍： Biochar stands as a distinguished academic journal delving into multidisciplinary subjects such as agronomy, environmental science, and materials science. Its pages showcase innovative articles spanning the preparation and processing of biochar, exploring its diverse applications, including but not limited to bioenergy production, biochar-based materials for environmental use, soil enhancement, climate change mitigation, contaminated-environment remediation, water purification, new analytical techniques, life cycle assessment, and crucially, rural and regional development. Biochar publishes various article types, including reviews, original research, rapid reports, commentaries, and perspectives, with the overarching goal of reporting significant research achievements, critical reviews fostering a deeper mechanistic understanding of the science, and facilitating academic exchange to drive scientific and technological development.