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| Effects of biochar on the migration and accumulation of lead and cadmium in soil-plant systems |
| Received:June 30, 2020 |
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| KeyWord:biochar;soil;heavy metal;lead;cadmium |
| Author Name | Affiliation | E-mail | | HUANG Lian-xi | Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | | WEI Lan | Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | | LIU Xiao-wen | South China Institute of Environmental Science, Guangzhou 510655, China | | | WU Ying-xin | South China Institute of Environmental Science, Guangzhou 510655, China | | | LI Xiang | Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | | HUANG Yu-fen | Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | | HUANG Qing | Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | | | LIU Zhong-zhen | Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture
Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China | lzzgz2001@163.com |
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| Abstract: |
| The aim of the present study was to examine the effects of different biochar treatments on the migration and accumulation of heavy metals(lead and cadmium)in soil-plant systems. Pot experiments were conducted based on biochar treatments comprising peanut shells, rice husks, wheat straw, coconut husks, or biogas waste products of varying particle sizes. Then, the biomass and accumulation of lead and cadmium in edible plant parts, the variation in soil physical and chemical properties, and the available lead and cadmium contents in the soil were determined. The results showed that biochar application could improve soil pH, soil organic carbon content, and cation exchange capacity(CEC)to varying degrees. With the exception of wheat straw biochar, the other four biochar treatments significantly reduced the accumulation of available lead and cadmium in the soil and edible plant parts and had obvious growth-promoting effects on vegetables. The smaller the biochar particle size, the more significant the decrease in soil available lead and cadmium contents, the more obvious the promotion of vegetable growth, and the greater the decrease in vegetable lead and cadmium accumulation. Vegetable growth was significantly positively correlated with soil pH, organic carbon content, and CEC, whereas vegetable lead and cadmium accumulation and soil available lead and cadmium contents were significantly negatively correlated with soil pH, organic carbon content, and CEC. After three successive crops of vegetables, coconut husk biochar of 80~120 meshes, peanut shell biochar, rice husk biochar, and biogas waste biochar still showed obvious beneficial effects on acid soils polluted with lead and cadmium. The above results show that most biochar treatments significantly promoted vegetable growth, reduced soil heavy metals contents, and mitigated the cumulative effects of soil heavy metals on vegetables by improving soil physicochemical properties such as soil pH value, CEC, and organic carbon content. |
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