Comparison of plant Cd accumulation from a Cd-contaminated soil amended with biochar produced from various feedstocks
| Autor: | Koji Kameyama, Yukiyoshi Iwata, Teruhito Miyamoto |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Cadmium
Health Toxicology and Mutagenesis Amendment chemistry.chemical_element General Medicine 010501 environmental sciences 01 natural sciences Pollution Husk Soil contamination Soil chemistry Environmental chemistry Soil pH Charcoal Biochar Soil water Environmental Chemistry Humans Soil Pollutants Woodchips 0105 earth and related environmental sciences |
| Zdroj: | Environmental science and pollution research international. 28(10) |
| ISSN: | 1614-7499 |
| Popis: | The bioavailability of cadmium (Cd) in agricultural soils is a significant health concern due to the potential risk of human exposure via foods grown in Cd-contaminated fields. Biochar has been known to have a highly porous structure and high pH, as well as containing various functional groups; as such, it can immobilize heavy metals. Although it has found that biochar amendment in Cd-contaminated agricultural soils could be effective in reducing Cd bioavailability in previous studies, differences in plant Cd accumulation from Cd-contaminated soils amended with biochars produced from various types of biomass have not been fully discussed yet; we aimed to address this shortcoming in the present work. The soil investigated was an acid soil (pH 5.1) and had an elevated concentration of Cd (total Cd: 3.3 mg kg-DW−1). Six kinds of biochar were produced, i.e., from woodchips (Japanese cedar [CE] and Japanese cypress [CY]), moso bamboo (MB), rice husk (RH), poultry manure (PM), and wastewater sludge (WS), at a pyrolysis temperature of 600 °C. Biochars were incorporated into the Cd-contaminated soil at 3% (w/w) and pot experiments using Brassica rapa var. perviridis were conducted for 28 days in a growth chamber. The Cd concentrations in the above-ground portion of the plants were significantly decreased as a result of the incorporation of all biochars compared to the unamended soil, with reduction ratios following the order PM (78%) > > WS (31%) ≈ RH (29%) ≈ MB (28%) ≈ CY (26%) > CE (19%). Among all biochar-amended soils, soil pH and shoot biomass were highest for those amended with PM-derived biochar. These results suggest that in Cd-contaminated soils, PM-derived biochar may offer significant potential in reducing plant Cd accumulation due to the immobilization of soil Cd and an effect of dilution resulting from enhanced plant shoot biomass. |
| Databáze: | OpenAIRE |
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