生物炭对土壤-植物体系汞含量的影响  

Effect of Biochar on Hg Content in Soil-plant System

作　　者：高翠翠 王道涵 王营军 汤家喜 GAO Cui-cui;WANG Dao-han;WANG Ying-jun(College of Environmental Science and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000)

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000

出　　处：《安徽农业科学》2024年第7期55-58,77,共5页Journal of Anhui Agricultural Sciences

基　　金：辽宁工程技术大学学科创新团队资助项目(LNTU20NTD-24);辽宁省教育厅科学技术基础研究项目(LJ2019JL029)。

摘　　要：[目的]研究在生物炭影响下土壤和植物中汞含量的变化趋势。[方法]以章古台风沙土壤为研究对象,向土壤中添加不同浓度的外源汞、不同浓度梯度的生物炭,对土壤和植物样品进行测定。[结果]不同浓度外源汞处理下,土壤汞残留率、植物体内汞残留率和富集系数均在生物炭添加量为16.0 g/kg表现较好效果;当外源汞浓度为16.0 mg/kg,生物炭添加量为16.0 g/kg,土壤汞残留率提高,达到47.204%,植物体内汞残留率最小,为37.193%,富集系数最低,降至0.844。外源汞浓度为32.0 mg/kg,土壤汞残留率提高了7.949百分点;外源汞浓度为4.0 mg/kg,植物体内汞残留率降低了12.145百分点,富集系数减少了0.734。[结论]生物炭可以把汞钝化在土壤中,具有修复和改良汞污染土壤的特征,且添加量为16.0 g/kg效果较好。[Objective]To study the change trend of Hg content in soil and plants under the influence of biochar.[Method]The aeolian sandy soil of Zhanggu Platform was used as the research object.Different concentrations of exogenous Hg and different concentration gradients of biochar were added to the soil,and soil and plant samples were measured.[Result]Under the treatment of different concentrations of exogenous Hg,the Hg residual rate in soil,Hg residual rate and enrichment coefficient in plants all performed better under the biochar addition amount of 16.0 g/kg.When the exogenous Hg concentration was 16.0 mg/kg and the amount of biochar was 16.0 g/kg,the Hg residue rate in soil was increased and reached 47.204%,the lowest Hg residue rate in plants was 37.193%,and the lowest enrichment coefficient was 0.844.When the concentration of exogenous Hg was 32.0 mg/kg,soil Hg residue rate was increased by 7.949 percentage points.When the concentration of biochar was 4.0 g/kg,the residual rate of Hg in plants was reduced by 12.145 percentage points,the enrichment coefficient decreased by 0.734.[Conclusion]Biochar can passivate mercury in soil and has the characteristics of repairing and improving mercury-contaminated soil,and the best effect is achieved when the addition amount is 16.0 g/kg.

关 键 词：土壤 植物 生物炭 汞污染 汞含量 

分 类 号：X171.1[环境科学与工程—环境科学]