山西农业大学学报（自然科学版）2019，Vol.39Issue(3)：58-64,7.DOI:10.13842/j.cnki.issn1671-8151.201901023
老化生物炭对小白菜积累重金属的影响
Effect of aged biochar on the accumulation of heavy metals in pakchoi (Brassica chinensis L.)
摘要
Abstract
[Objective]Biochar has strong adsorption and fixation capacity to heavy metals in soil,which can reduce the accumula-tion of heavy metals by plants.Biochar undergoes oxidizing process under various biological and abiotic factors once it is introduced into soil.The oxidizing process makes the biochar aging which changes the physicochemical properties of biochar and thus influ-ence the heavy metals availability in soil and the accumulation of heavy metals in plants,however,the research on this filed was much limited.[Methods]In the present study,the pristine biochar was aged by oxidant-drying/wetting-freeze/thaw alternating cycle method.The cation exchange capacity (CEC),element content and surface functional groups before and after biochar aging was compared.And pot experiment was set to investigate the aging effects on the accumulation of heavy metal (Pb,Cu and Cd) in pakchoi (Brassica chinensis L.).[Results]The results showed that aging increased the CEC,O/C value and the number of hy-droxyl and carbonyl groups on the surface of biochar.Compared with the treatment without biochar addition (control group),the application of aged biochar significantly increased soil pH and the organic matter content (P<0.05).However,the bioavailable concentration of heavy metals in soil was significantly reduced by adding aged biochar.And the reducing effect was more obvious with the increasing of biochar application rate,that is,the concentration of Pb,Cu and Cd in soil decreased by 12.42%,11.67%, 11.21% for aged biochar with 5% application,respectively,compared to the control.Accordingly,the accumulation of heavy metals in the pakchoi was also significantly reduced by addition of aged biochar (P<0.05).Consequently,the contents of Pb,Cu and Cd in pakchoi without biochar treatment were 24.33 mg·kg-1 ,28.8 mg·kg-1 ,and 0.2 mg·kg-1 ,respectively,whereas those were markedly decreased to 3.33 mg·kg-1 ,7.23 mg·kg-1 ,and 0.03 mg·kg-1 under 5% aged biochar treatment.[Conclusion] Therefore,the aged biochar still effectively reduced the bioavailability of heavy metals to plants which is important to evaluate the long-term application of biochar in remediation of heavy metal polluted soil.关键词
生物炭/老化/表面官能团/重金属/生物有效性Key words
Biochar/Aging/Surface functional groups/Heavy metal/Bioavailability分类
资源环境引用本文复制引用
刘艳,王聪颖,史志明,杨斌..老化生物炭对小白菜积累重金属的影响[J].山西农业大学学报（自然科学版）,2019,39(3):58-64,7.基金项目
山西省科技重大专项(20121101007) （20121101007）
