Effect of biochar on the accumulation and distribution of cadmium in tobacco (Yunyan 87) at different developmental stages

Ecotoxicology and Environmental Safety

Lin Wei¹  Hanjun Zhou²  Xiefeng Ye²  Jing Wang²  Pengwei Yao²  Xueli Li³  Sheng Zhang⁴ 

[1] College of Forestry, Henan Agricultural University, Zhengzhou, 450002, China;College of Tobacco Science, Henan Agricultural University, National Tobacco Cultivation and Physiology and Biochemistry Research Center, Key Laboratory for Tobacco Cultivation of Tobacco Industry, Zhengzhou, 450002, China;Staff Development Institute of China National Tobacco Corporation, Zhengzhou, 450002, China;Xiangxi Autonomous Prefecture Tobacco Company, Jishou, 416000, Hunan, China;

关键词: Tobacco stem-derived biochar;    Severe Cd stress;    Remobilization;    Bioavailability;    Developmental stage;   

DOI  :  

来源: DOAJ

【 摘 要 】

Cadmium (Cd) easily accumulates in tobacco, which endangers public health through Cd exposure from smoking. However, its uptake, translocation, and distribution in tobacco plants during plant development or its response to biochar application are poorly understood. A pot experiment was conducted with tobacco (Yunyan 87) grown in soil severely contaminated with Cd (30 mg kg−1) amended with 0, 1, and 2% (w/w) tobacco stem-derived biochar (BC). The absorption and accumulation of Cd in all parts of the tobacco plants were most active from the rosette stage to the fast growing stage, during which approximately 90% of the Cd deposited in the tobacco leaves occurred, especially in the lower leaves. The Cd concentrations in most plant parts without added biochar decreased significantly by 52.61–78.30% due to the rapid increase in biomass (dilution effect), although the Cd concentration in the lower leaves increased by 48.89% (P < 0.05). However, with the slowdown of the growth rate of tobacco at the maturity stage, the proportion of Cd accumulation in roots and stems without biochar addition increased by 29.01%, resulting in an increased Cd concentration in roots and stems by 63.29–86.80% (P < 0.05). In the different growth stages, the application of biochar reduced the contents of DTPA-extractable and exchangeable Cd in the soil by 5.11–35.14% and 9.20–54.05%, respectively, thus reducing the absorption, accumulation and concentration of Cd in all parts of the tobacco plant. In addition, the inhibitive effect of biochar on the Cd concentration in the leaves was weak at the rosette stage (22.17–53.72%) compared with the other stages (46.14–78.88%), and the degree of inhibition of biochar on the Cd concentration in the middle leaves (37.94–59.24%) was lower than that in the upper and lower leaves (49.04–73.54%) at all developmental stages. However, the long-term remediation effect of biochar on soil Cd contamination needs to be further verified, and the combination of biochar and other technologies should receive additional attention.

【 授权许可】

Unknown