籽粒苋-钝化剂联合修复系统对菜地土壤和西蓝花重金属含量的影响
2021-06-15梁金明王珂杨国义李彬邓玉朱雅琪
梁金明 王珂 杨国义 李彬 邓玉 朱雅琪



摘要 为了保障菜地土壤的安全利用,修复菜地土壤重金属污染、降低蔬菜重金属含量,对籽粒苋-钝化剂联合修复系统对菜地土壤和西蓝花重金属含量的影响进行研究。结果表明,籽粒苋种植可以显著降低菜地土壤Cd、Pb、Ni含量(P<0.05);籽粒苋-钝化剂联合修复系统可以显著降低西蓝花Cd、Pb含量(P<0.05);西蓝花种植可以显著降低土壤Hg、Cr、Ni含量(P<0.05),不宜在重金属污染土壤中种植。
关键词 籽粒苋;植物修复;钝化剂;菜地土壤;西蓝花;重金属含量;影响
中图分类号 X53文獻标识码 A
文章编号 0517-6611(2021)10-0070-03
doi:10.3969/j.issn.0517-6611.2021.10.019
开放科学(资源服务)标识码(OSID):
Study on the Effect of Grain Amaranth-passivator Combined Remediation System on the Heavy Metal Content of Vegetable Soil and Broccoli
LIANG Jin-ming1,WANG Ke2,YANG Guo-yi3 et al (1.Zhongshan Agricultural Science and Technology Extension Center,Zhongshan,Guangdong 528400;2.Pearl River Hydraulic Research Institute,Pearl River Water Conservancy Commission,Guangzhou,Guangdong 510611;3.Institute of Eco-Environment and Soil,Guangdong Academy of Sciences/Key Laboratory of Comprehensive Management of Agricultural Environment of Guangdong Province,Guangzhou,Guangdong 510650)
Abstract In order to ensure the safe use of vegetable soil,repair heavy metal pollution in vegetable soil,and reduce vegetable heavy metal content,this paper studied the effect of grain amaranth-passivator combined remediation system on the heavy metal content of vegetable soil and broccoli.The results showed that the grain amaranth planting could significantly reduce the Cd,Pb,Ni content of vegetable soil(P<0.05).Grain amaranth-passivator combined repair system can significantly reduce broccoli Cd,Pb content(P<0.05).Broccoli planting could significantly reduce the soil Hg,Cr and Ni content (P<0.05),and it was not suitable for planting in heavy metal contaminated soil.
Key words Grain amaranth;Phytoremediation;Passivator;Vegetable soil;Broccoli;Heavy metal content;Effect
随着工业化的发展和农业化肥的过度使用,耕地土壤重金属污染问题日趋严峻[1-3]。生态环境部全国土壤污染状况调查结果显示,我国耕地土壤点位超标率最高,达19.4%,主要污染物以重金属为主[4]。重金属可以在农作物体内富集,并通过食物链最终进入人体,对人体健康产生危害,其中以蔬菜类富集重金属能力最强[5-6]。有学者对我国多个城市郊区蔬菜重金属污染研究发现,多数郊区蔬菜受到不同程度的重金属污染,其中以Pb、Cd超标现象最为普遍[7]。为了保护人体健康,修复菜地土壤重金属污染、降低蔬菜重金属含量、保障菜地土壤的安全利用成为当前学术界研究热点之一[8]。因此,笔者以广东省中山市某蔬菜基地为研究对象,研究籽粒苋-钝化剂联合修复技术对菜地土壤和西蓝花重金属含量的影响,对提高菜地受污染土壤安全利用率和保障当地蔬菜质量安全具有重要意义。
1 材料与方法
1.1 试验地点及土壤重金属含量 试验地点位于广东省中山市某蔬菜基地(113.42°E、22.26°N),高程-2.2 m。……
