Phytoremediation Efficiency of Two Cultivars of Brassica napus L. Under Water-soluble Chitosan Treatment in Typical Pb-contaminated Farmland Soils

被引：0
|
作者：
Meng X.-F. [1 ,2 ]
Zheng G.-D. [1 ,2 ]
Chen T.-B. [1 ,2 ]
Yang J.-X. [1 ,2 ]
Guo J.-M. [3 ]
Liu J. [4 ]
机构：
[1] Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing
[2] University of Chinese Academy of Sciences, Beijing
[3] College of Environmental Science and Engineering, Taiyuan University of Technology, Jinzhong
[4] College of Bioscience and Resources Environment, Beijing University of Agriculture, Beijing
来源：
Huanjing Kexue/Environmental Science | 2022年 / 43卷 / 05期
关键词：
Brassica napus L; Farmland; Lead(Pb); Phytoremediation; Water-soluble chitosan;
D O I：
10.13227/j.hjkx.202106076
中图分类号：
学科分类号：
摘要：
A pot trial was used to explore the absorption and transportation of the Pb of QY-1 and SYH (Brassica napus L.) under 0%, 2%, and 4% water-soluble chitosan (WSC) treatments in two typical Pb-contaminated farmland soils in China (north: Henan province and south: Guangxi province). Based on the results of the pot trial, a field experiment was conducted to compare the remediation efficiency of the QY-1 and SYH under WSC treatment in northern farmland soil, and the environmental risk and economic value under field conditions were analyzed. The results of the pot trial showed that the biomasses of QY-1 and SYH were significantly affected by WSC addition and soil type compared with that of the control. The biomass of QY-1 was reduced with the application of WSC, and the shoot and root biomass of SYH were significantly increased under the treatment of low concentrations of WSC; conversely, these were decreased under the treatment of high concentrations of WSC. The shoot biomass of SYH increased notably under the 2% WSC treatment in Guangxi soil, which increased by 80.96% compared with that of the control treatment. Lead concentrations in different parts of B. napus were also affected by WSC addition and soil type. Pb in the shoots and roots of QY-1 increased with increasing WSC addition in Henan soil, whereas it decreased with the increase in WSC addition in Guangxi soil. The extraction amount of Pb was the key to evaluating the efficiency of phytoremediation. Lead uptake of QY-1 showed an increasing trend in Henan soil but a decreasing trend in Guangxi soil. In Guangxi soil, although the total Pb uptake of the QY-1 and SYH-combined application of 2% WSC was not significantly different, the biomass and Pb absorption amount of the SYH-combined application of 2% WSC were significantly higher than that of QY-1, and the shoot Pb extraction amount was higher. The results of the field experiment also confirmed that the phytoremediation efficiency of SYH combined with WSC was higher than that of QY-1. Additionally, concentrations of Pb in the rapeseed oils of QY-1 and SYH were lower than the limit of the maximum level of ω(Pb)in market rapeseed oils (GB 2762-2017, ≤0.1 mg•kg-1). Therefore, the mode of B. napus combined with WSC had great application potential in the rational utilization and remediation of mildly and moderately Pb-contaminated farmland soil in China. © 2022, Science Press. All right reserved.
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页码：2741 / 2750
页数：9
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