期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 666, 期 -, 页码 1126-1133出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.02.215
关键词
Phytoremediation; Cadmium; Plants; Microbes; Sediments
资金
- Program for the National Natural Science Foundation of China [51879101, 51579098, 51779090, 51709101, 51521006, 51809090, 51278176, 51378190]
- National Program for Support of Top-Notch Young Professionals of China (2014)
- Program for Changjiang Scholars and Innovative Research Teamin University [IRT-13R17]
- Hunan Provincial Science and Technology Department Plan Project [2018SK20410, 2017SK2243, 2016RS3026]
- Fundamental Research Funds for the Central Universities [531109200027, 531107051080, 531107050978]
Cadmium (Cd) contamination in river sediments becomes increasingly serious, and phytoremediation has been used to re mediate Cd contaminated sediments, but the remediation efficiency needs to be improved. In this study, tea waste derived biochar (TB) was used to facilitate the phytoremediation of Cd contaminated sediments. Results showed that TB at 100, 500 and 1000 mg kg(-1) increased Cd accumulation and translocation in ramie seedlings by changing Cd speciation in sediments and altering the subcellular distribution of Cd in plant cells. TB at low contents alleviated Cd induced toxicity in ramie seedlings by promoting plant growth and mitigating the oxidative stress. In addition, the activities of urease-, phosphatase-, and catalase-producing microbes in the Cd contaminated sediments were promoted by the application of TB. These findings demonstrated that biochar at low concentrations could improve the phytoremediation efficiency and mitigating Cd-induced toxicity to plants and microbes in Cd contaminated sediments. This study herein provides a novel technological application of waste biomass in controlling and mitigating risks of heavy metals. (C) 2019 Elsevier B.V. All rights reserved.
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