Remediation efficacy of Sedum plumbizincicola as affected by intercropping of landscape plants and oxalic acid in urban cadmium contaminated soil

被引：20

作者：

Hou, Shuzhen ^{[1
]}

Wang, Xin ^{[1
]}

Shafi, Mohammad ^{[2
]}

Penttinen, Petri ^{[1
]}

Xu, Weijie ^{[1
]}

Ma, Jiawei ^{[1
]}

Zhong, Bin ^{[1
]}

Guo, Jia ^{[3
]}

Xu, Meizhen ^{[2
]}

Ye, Zhengqian ^{[1
]}

Liu, Dan ^{[1
]}

Wang, Hailong ^{[4
]}

机构：

[1] Zhejiang A&F Univ, Sch Landscape Architecture, State Key Lab Subtrop Silviculture, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China

[2] Univ Agr, Dept Agron, Peshawar, Pakistan

[3] Zhejiang Chengbang Landscape Co Ltd, Hangzhou 311300, Zhejiang, Peoples R China

[4] Foshan Univ, Biochar Engn Technol Res Ctr Guangdong Prov, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

来源：

JOURNAL OF SOILS AND SEDIMENTS | 2019年 / 19卷 / 10期

关键词：

Heavy metal; Intercropping; Landscape plants; Oxalic acid; Sedum plumbizincicola; OXIDATIVE STRESS; ACCUMULATION; BAMBOO; PHYTOEXTRACTION; TOXICITY; PHYTOREMEDIATION; METALS; GROWTH; LEAD; HYPERACCUMULATOR;

D O I：

10.1007/s11368-019-02309-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Purpose Intercropping is a promising technique for remediation of soils contaminated with heavy metals. Organic acids can increase the availability of heavy metals in soil. Our aim was to assess the effect of oxalic acid as an activator for hyperaccumulator-landscape plant intercropping to efficiently restore contaminated soil with low cost. Materials and methods The hyperaccumulator plant (Sedum plumbizincicola) was intercropped with selected landscape plants: Oxalis corniculate (ground cover plant), Calendula officinalis (grass flower plant), and Buxus sinica (shrub). The effects of 11 mmol kg(-1) oxalic acid treatment on growth and Cd accumulation capacity of Sedum plumbizincicola-landscape plants intercropping systems were evaluated in a 76-day pot experiment. Results and discussion Oxalic acid has increased the availability of Cd in soil. The biomass of Sedum, Oxalis, and Buxus plants was higher in treatment of oxalic acid than without oxalic acid. The biomass, chlorophyll, and catalase contents of Calendula were lower in treatment of oxalic acid than without oxalic acid, which indicated severe stress caused by enhanced availability of Cd. The malondialdehyde contents of Calendula and Buxus were higher in treatment of oxalic acid, which indicates that higher Cd availability has resulted damage of membrane. The free proline contents of Calendula and Buxus were higher in treatment of oxalic acid. The Cd content of Sedum plants was higher in treatment of oxalic acid than lower Cd in landscape plants with no application of oxalic acid. Conclusions It is concluded that oxalic acid has a positive effect on remediation efficiency of Sedum plumbizincicola-Oxalis and Sedum plumbizincicola-Buxus intercropping systems. Oxalic acid has enhanced remediation efficiency of hyperaccumulator-landscape plants intercropping which has offered a new, useful and practical technique for remediation of urban soils with low-level Cd contamination.

引用

页码：3512 / 3520

页数：9