生物质碳对土壤中微囊藻毒素生物有效性的影响

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摘要通过向土壤中添加水稻秸秆生物质碳（RSB）、玉米秸秆生物质碳（MSB）和鸡粪生物炭（CMB）来减少微囊藻毒素-LR（MC-LR）在生菜中的富集.结果表明，RSB、MSB和CMB在添加量为2%时，生菜叶片中MC-LR含量较空白分别降低了58.0%、49.5%和70.4%，使得每日估计摄入量降低到WHO的每日允许摄入量限值以下.CMB显著降低了土壤中MC-LR的总含量，而其他处理则无显著影响.3种生物质碳均显著降低了有效态MC-LR含量，且生菜根系和叶片中MC-LR的含量与土壤MC-LR有效态含量均呈显著正相关关系.所有添加生物质碳处理均对生菜生长无负面影响.

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	操庆
	刘伟京
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	谢丽强
	尤本胜
	姜伟立
	杨柳燕

关键词 ：生物质碳, 微囊藻毒素, 生物富集, 生物有效性, 土壤-作物系统

Abstract：Three kinds of biochars, rice straw biochar (RSB), maize straw biochar (MSB), and chicken manure biochar (CMB), were added to the soil in order to reduce microcystin-LR (MC-LR) bioaccumulation in lettuce. Results showed that addition of 2% RSB, MSB and CMB decreased the content of MC-LR in the lettuce leaves by 58.0%, 49.5% and 52.3%, respectively, and the estimated daily intake values were much lower than the tolerable daily intake limit proposed by the WHO. All the biochars have no significant impact on soil total MC-LR concentration except CMB, which significantly decreased soil total MC-LR concentration. Bioavailable MC-LR concentrations were significantly decreased by all three biochars. The correlation analysis showed that there was a positive correlation between the bioavailable MC-LR concentrations in the soil and the MC-LR content in lettuce roots, as well as the leaves. Application of biochars had no negative impact on lettuce growth.

Key words： biochar microcystins bioaccumulation bioavailability soil-plant system

收稿日期: 2020-04-11

PACS:	X171.5
	X53

基金资助:国家自然科学基金青年基金资助项目（41907350）；中国博士后科学基金资助项目（2019M651753）

通讯作者: 杨柳燕,教授,yangly@nju.edu.cn E-mail: yangly@nju.edu.cn

作者简介: 操庆(1989-),男,安徽安庆人,工程师,博士,主要从事蓝藻毒素的生态毒理效应研究.发表论文10余篇.

引用本文:

操庆, 刘伟京, 顾毓蓉, 谢丽强, 尤本胜, 姜伟立, 杨柳燕. 生物质碳对土壤中微囊藻毒素生物有效性的影响[J]. 中国环境科学, 2020, 40(12): 5444-5450. CAO Qing, LIU Wei-jing, GU Yu-rong, XIE Li-qiang, YOU Ben-sheng, JIANG Wei-li, YANG Liu-yan. Effects of biochar application on the bioavailability of microcystins in soils. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5444-5450.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2020/V40/I12/5444

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