Comparison of plant Cd accumulation from a Cd-contaminated soil amended with biochar produced from various feedstocks

被引:9
作者
Kameyama, Koji [1 ]
Miyamoto, Teruhito [1 ]
Iwata, Yukiyoshi [1 ]
机构
[1] Natl Agr & Food Res Org NARO, Inst Rural Engn, 2-1-6 Kannondai, Tsukuba, Ibaraki 3058609, Japan
关键词
Soil contamination; Biochar; Cadmium; Biomass feedstock; Pyrolysis; Soil amendment; PYROLYSIS TEMPERATURE; CADMIUM; BIOAVAILABILITY; MOBILITY; LEAD; IMMOBILIZATION; WASTE; ZINC; PB; AVAILABILITY;
D O I
10.1007/s11356-020-11249-2
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 degrees C. Biochars were incorporated into the Cd-contaminated soil at 3% (w/w) and pot experiments usingBrassica rapa var. perviridiswere 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%) approximate to RH (29%) approximate to MB (28%) approximate to 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.
引用
收藏
页码:12699 / 12706
页数:8
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