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| Evaluating the effects of specifically designed biochar amendments on the remediation of cadmiumcontaminated soils |
| Received:June 30, 2020 |
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| KeyWord:biochar;Cd;soil properties;biochar-based treatments;field test;agricultural safety |
| Author Name | Affiliation | E-mail | | 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 | | | 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 | | | LIU Xiao-wen | South China Institute of Environmental Science, Ministry of Ecology and Environment, 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 | | | ZHANG Jian-wen | Bureau of Agriculture and Rural Affairs of Yunfu Municipality, Yunfu 527300, China | | | TU Xin-hong | Agricultural and Rural Bureau of Renhua County, Renhua 512300, 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 | | | WU Ying-xin | South China Institute of Environmental Science, Ministry of Ecology and Environment, Guangzhou 510655, 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: |
| Three biochar-based treatments were designed and tested in three demonstration plots(two plots in Shaoguan and one plot in Yunfu), containing different levels of Cd and varying physical/chemical properties, to evaluate the effects of biochar treatment on cadmium-polluted soils. The results showed that the application of the designed biochar-based treatment did not reduce crop yield in any of the three plots. In fact, maize yield significantly increased by 383.03% in heavily Cd-contaminated soils. Compared to the control treatment, the designed biochar-based treatments led to decreases in the Cd content of edible plant parts by 33.33%(maize grain), 46.88%(brown rice) and 42.86%(brown rice), respectively. Meanwhile, the treatment of areas 1 and 2 resulted in the Cd content of the agricultural products to meet Chinese health standards. The application of biochar-based treatments could reduce the content of acid-soluble Cd in soils, particularly in strongly acidic and highly Cd-polluted soils, as in area 1. The B1 treatment could reduce the bioavailable Cd content of soils by 81.72%. Overall, designing biochar-based treatments based on degree of soil heavy metal pollution and soil physical/chemical properties maintained crop yields, reduced the Cd content of edible plant parts, and remediated soils contaminated with heavy metals in southern China. |
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