文章摘要
郎乾乾,李艳梅,夏宇,王超,刘振刚,邹国元,孙钦平.玉米秸秆水热生物炭施用对土壤重金属Cd生物有效性和微生物群落的影响[J].农业环境科学学报,2024,43(6):1303-1311.
玉米秸秆水热生物炭施用对土壤重金属Cd生物有效性和微生物群落的影响
Effects of corn stalk hydrothermal biochar application on the Cd bioavailability and microbial community in soil
投稿时间:2023-12-07  
DOI:10.11654/jaes.2023-1044
中文关键词: 水热炭化  水热炭  重金属  生物有效性  微生物群落
英文关键词: hydrothermal carbonization  hydrochar  heavy metal  bioavailability  microbial community
基金项目:北京市农林科学院青年基金项目(QNJJ202125);北京市农林科学院植物营养与资源环境研究所所长基金项目(YZS202101);财政部和农业农村部:国家现代农业产业技术体系项目
作者单位E-mail
郎乾乾 北京市农林科学院植物营养与资源环境研究所, 北京 100097  
李艳梅 北京市农林科学院植物营养与资源环境研究所, 北京 100097  
夏宇 中国城市建设研究院有限公司, 北京 100120  
王超 北京市农林科学院植物营养与资源环境研究所, 北京 100097  
刘振刚 中国科学院生态环境研究中心, 北京 100085
中国科学院大学, 北京 100049 
zgliu@rcees.ac.cn 
邹国元 北京市农林科学院植物营养与资源环境研究所, 北京 100097  
孙钦平 北京市农林科学院植物营养与资源环境研究所, 北京 100097 qpsun@163.com 
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中文摘要:
      为了探究玉米秸秆水热生物炭(简称水热炭)施用对镉(Cd)污染土壤的修复效果及作用机制,通过盆栽试验,分析了不同水热炭在不同添加率下(1%和 3%)对土壤 Cd生物有效性和作物吸收的影响,并探究了不同条件下的微生物群落结构。结果表明:与对照相比,水热炭施用显著提高了土壤有机质和溶解性有机碳含量,土壤中二乙烯三胺五乙酸提取的Cd(DTPA-Cd)和油菜叶片 Cd含量分别降低了 5.01%~20.98%和 10.82%~34.16%。提高水热温度和水热炭添加率有助于降低土壤 DTPA-Cd含量。此外,施用水热炭显著增强了根际土壤细菌的多样性和丰度,且明显改变了微生物群落结构。与对照组相比,施用水热炭显著降低了根际土壤中Actinobacteriota的相对丰度,提高了Proteobacteria和Bacteroidota的相对丰度。冗余分析表明土壤溶解性有机碳含量是影响根际土壤细菌群落结构的关键因素。因此,水热炭对重金属污染土壤有很大的修复潜力,但其对土壤重金属的长期效应有待进一步研究。
英文摘要:
      To explore the remediation effects of hydrothermal biochar derived from corn stalk(abbreviated as hydrochar)application on cadmium(Cd)-contaminated soil and the corresponding mechanism, a pot experiment was conducted to analyze the effects of different corn stalk hydrochars under different application ratios(1% and 3%)on the Cd bioavailability in soil and plant uptake. The microbial community structures under different conditions were also explored. Results showed that compared with the blank control(CK), hydrochar application significantly increased the soil organic and organic carbon contents, and diethylenetriamine pentaacetic acid extracted Cd (DTPA-Cd)content in soil and Cd content in rape leaf were decreased by 5.01% – 20.98% and 10.82% – 4.16%, respectively. The increased hydrothermal temperature and hydrochar application ratio contributed to reducing the DTPA-Cd content in soil. In addition, hydrochar application substantially enhanced the bacterial diversity and abundance in rhizosphere soils and obviously changed the microbial community structure. Compared with the CK, hydrochar application significantly reduced the relative abundance of Actinobacteriota and increased the relative abundances of Proteobacteria and Bacteroidota in rhizosphere soils. Redundancy analysis revealed that the soil dissolved organic carbon content was the key factor that influences the bacterial community structure in rhizosphere soil. Therefore, hydrochar has great potential for the remediation of metal-contaminated soils. However, its long-term effects on soil heavy metals requires further research.
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