伴矿景天植物汁液还田对土壤重金属形态及植物吸收的影响

李振炫; 杨钰莹; 董蓓; 胡鹏杰; 吴龙华; 骆永明

doi:10.12153/j.issn.1674-991X.20190152

伴矿景天植物汁液还田对土壤重金属形态及植物吸收的影响

doi: 10.12153/j.issn.1674-991X.20190152

李振炫¹,
杨钰莹^1,2,
董蓓²,
胡鹏杰^2,*, ,,
吴龙华²,
骆永明²

^1. 江苏省大气环境与装备技术协同创新中心,江苏省大气环境监测与污染控制高技术重点实验室,南京信息工程大学
^2. 中国科学院土壤环境与污染修复重点实验室,中国科学院南京土壤研究所

详细信息

作者简介:
李振炫(1981—),男,副教授,博士,主要从事水污染控制技术及工程研究,zhenxuan325@163.com

通讯作者:
胡鹏杰 E-mail: pjhu@issas.ac.cn

中图分类号: X53
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出版历程
- 收稿日期: 2019-08-30
- 刊出日期: 2020-05-20

Effect of Sedum plumbizincicola liquor returning to soils on the speciation and phytoextraction of heavy metals

^1. Jiangsu Collaborative Innovation of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing University of Information Science & Technology
^2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Nanjing Institute of Soil Research, Chinese Academy of Sciences

More Information

Corresponding author: HU Pengjie E-mail: pjhu@issas.ac.cn

摘要

摘要: 超积累植物伴矿景天在Cd和Zn污染土壤修复方面展现出广泛应用前景,但收获物压榨脱水后产生的含重金属汁液处理是目前亟待解决的问题。选用酸性和中性土壤,通过盆栽试验将不同剂量的伴矿景天汁液还田并种植伴矿景天,监测土壤中pH、可溶性有机碳(DOC)浓度和CaCl₂提取态Cd与Zn(CaCl₂-Cd/Zn)浓度动态变化及植物生长和重金属再吸收情况。结果表明:添加汁液后7和30 d,酸性土壤pH升高而中性土壤pH降低,2种土壤中DOC浓度均显著升高;生长中后期土壤pH、DOC浓度与不添加汁液的对照接近;汁液处理的酸性土壤中CaCl₂-Cd/Zn浓度随着生长时间延长逐步升高,在第105天达最高,而中性土壤中浓度呈现逐步降低趋势;汁液处理使伴矿景天生长受到抑制,生物量降低,但其地上部Cd浓度升高;酸性土壤用100 mL/kg汁液处理,伴矿景天地上部Cd和Zn吸收量大于汁液带入量,修复后土壤Cd和Zn浓度低于原土的本底值。因此,酸性土壤适当剂量汁液还田并种植伴矿景天,可将汁液带入的Cd和Zn再次吸收去除,达到汁液处理和净化土壤的双重目的。
- 伴矿景天 /
- 汁液 /
- 重金属 /
- 还田 /
- 植物吸取
Abstract: Sedum plumbizincicola, a hyperaccumulator, has been widely used in the remediation of cadmium and zinc polluted soils, but the treatment of the crop liquor which contains heavy metals after squeeze and dehydration of harvest biomass is an urgent problem to be solved. Choosing acidic and neutral soils, a pot experiment was conducted to return different doses of liquor to two types of soils and to grow Sedum plumbizincicola. The dynamic changes of soil pH, dissoluble organic carbon (DOC), CaCl₂extractable Cd and Zn (CaCl₂-Cd/Zn), as well as plant growth and heavy metal reabsorption were monitored. The results showed that the pH increased in acid soil but decreased in neutral soil, and the DOC concentration of both soils increased significantly on 7 and 30 d after the addition of liquor, while the soil DOC concentration and pH were closed to the controlled soil in the middle and late growth stages. The CaCl₂-Cd/Zn concentrations in acid soil treated with liquor increased gradually with growing time, and reached maximum on 105 d, while those in neutral soil showed a gradual decline. The liquor treatment inhibited the growth of Sedum plumbizincicola with reduced biomass, but increased the concentration of Cd in the shoots. With 100 mL/kg liquor treatment of acid soil, Cd and Zn accumulation in Sedum plumbizincicola shoot was higher than the input by addition of liquor, and the soil Cd and Zn concentrations after remediation were lower than soil initial values before liquor addition. Consequently, suitable dosage of liquor returning to the acid soil and planting Sedum plumbizincicola could remove Cd and Zn input by liquor again and achieve the dual purpose of liquor treatment and soil remediation.
- Sedum plumbizincicola /
- liquor /
- heavy metal /
- returning to soil /
- phytoextraction

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