Performance and mechanistic study of biochar and magnesium-enhanced phytoremediation in cadmium-contaminated soil by alfalfa

被引:0
作者
Shen X. [1 ,3 ]
Sun T. [1 ,4 ]
Dai M. [2 ]
Aslam M.M.A. [1 ,4 ]
Peng C. [1 ,2 ]
机构
[1] School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu
[2] Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, Zhaoqing University, Zhaoqing
[3] College of Environmental Science and Engineering, Ocean University of China, Qingdao
[4] Observation and Research Station of Seawater Intrusion and Soil Salinization, Ministry of Natural Resources, Laizhou Bay, Shandong Province, Qingdao
关键词
Antioxidant capacity; Chemical form of Cd; Heavy metals; Medicago sativa L; Microbial community; Soil remediation;
D O I
10.1016/j.chemosphere.2024.142737
中图分类号
学科分类号
摘要
Recently, phytoremediation has been regarded as a green and environment friendly technique to treat metals contaminated soils. Thus, in this study, pot experiments were designed to investigate the combine effects of biochar and magnesium (MPs) to purify cadmium (Cd)-contaminated soils by Medicago sativa L. (alfalfa). The results showed that the combined use of biochar and Mg significantly increased the accumulation of Cd and promoted the transport of Cd from root to shoot in alfalfa, simultaneously. Importantly, the combined use of biochar and Mg could increase the accumulation of Cd in shoot and whole plant (shoot + root) of alfalfa up-to 59.1% and 23.1%, respectively. Moreover, the enhancement mechanism can be analyzed from several aspects. Firstly, the photosynthesis was enhanced, which was beneficial to plant growth. The product of photosynthesis provided energy for uptake and transport of Cd. Meanwhile, its transport in phloem could promote the transport of Cd. Secondly, the enhancement of antioxidant capacity of alfalfa effectively protected the membrane structure of alfalfa, which indicated that Cd could enter alfalfa from the channel on the cell membrane. Lastly, the chemical form of Cd and microbial community structure in soil were changed. Overall, these changes reduced the Cd toxicity in soil, enhanced the resistance capability of alfalfa, increased the Cd uptake by alfalfa and promoted the growth of alfalfa. Thus, the obtained results suggested that the combined use of biochar and Mg is an effective approach to enhance phytoremediation performance for purifying Cd-contaminated soils. © 2024
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