生态环境学报2017，Vol.26Issue(6)：1068-1074,7.DOI:10.16258/j.cnki.1674-5906.2017.06.021
水稻秸秆生物炭对污染土壤中镉生物有效性的影响
Bioavailability of Cd in Contaminated Soil after Short-term Application of Rice Straw Biochar
摘要
Abstract
In this study, indoor experiment was conducted to explore the effect of biochar on cadmium immobility in contaminated soil. Biochar pyrolyzed from rice straw under 400℃(0%, 0.5%, 1.5% and 3.0%) was added to Cd contaminated soil to test the change of DTPA-Cd along time, and explored the correlation between soil pH, organic carbon and the concentration of DTPA-Cd in soil. Pot experiment was also carried out with 3.0% of biochar to study the effects of biochar on maize growth and its uptake of Cd from soil. Results showed that 0.5% of biochar reduced the concentration of DTPA-Cd but the effect was not significant (P>0.05). The 1.5% and 3.0% of biochar could significantly reduce the concentration of DTPA-Cd in the soil (P<0.05), mainly due to the increase of soil pH and the content of soil organic carbon, 3.0% of biochar had the best effect on reducing the soil DTPA-Cd. In the cultivation period of 63 days, the concentration of DTPA-Cd in soil decreased faster at the beginning of biochar application, then increased slightly, and reached the relative dynamic equilibrium after 10 days of biochar application. Maize was harvested after 7 weeks in the pot experiment. The experiment result showed that biochar could significantly increase the biomass of maize (P<0.01) and decrease the Cd accumulation in the shoot (P<0.01) or root (P<0.05) of maize. Compared with the control treatment, 3.0% of biochar could reduce the accumulation of Cd in the shoot and root of maize by 60.58% and 25.43%, respectively. The 3.0% of biochar could also decrease the transportation of cadmium from root to shoot (P<0.05), the transfer factor was reduced by 47.22%. Our experiment results showed that biochar application in heavy metal contaminated soil could reduce the bioavailability of heavy metals, which could be a measurement to achieve the purpose of control heavy metal in food chain.关键词
生物炭/镉/生物有效性/玉米Key words
biochar/cadmium/bioavailability/maize分类
资源环境引用本文复制引用
张华纬,甄华杨,岳士忠,张慧琦,乔玉辉..水稻秸秆生物炭对污染土壤中镉生物有效性的影响[J].生态环境学报,2017,26(6):1068-1074,7.基金项目
国家自然科学基金项目(41471410) （41471410）
北京市生态学重点学科项目(XK10019440) （XK10019440）
