摘要
为研究生物炭、水分调节措施对污染土壤重金属有效性的影响,从而为利用水分调节措施进一步提高生物炭修复重金属污染土壤效果提供理论依据,以施用生物炭的重金属污染土壤为研究对象,研究了水分调节对施用生物炭土壤重金属形态的影响。研究结果表明:增加土壤水分含量,可以降低施用生物炭土壤可交换态重金属铜含量,促进可交换态重金属铜向可氧化态、可还原态铜转化;尤其是在100%田间持水量条件下,供试土壤可交换态重金属铜含量比对照低18.52%、可氧化态铜比对照增加17.48%、可还原态铜比对照高16.64%,与对照相比均差异显著(P<0.05),而残渣态与对照相比差异不明显。由此表明,利用水分调节措施可降低施用生物炭土壤可交换态重金属含量,降低土壤重金属生物毒性,提高生物炭对重金属污染土壤的修复效果。
In order to research the effects of biochar and water adjustment measures on the effectiveness of heavy metal in polluted soil,and to provide a theorical basis for water adjustment measures application to promote the restoring effect of biochar on heavy metal polluted soil,in this paper,copper polluted soil applied biochar was set as experimental object to research the effect of biochar application and water regulation on copper forms in soil.The experimental results showed that when water content in soil increased,exchangeable Cu would decrease and transforme to oxidizable and reducible forms.Especially under the condition of 100%field capacity,exchangeable Cu in soil was 18.52%lower than that of control treatment,oxidizable and reducible forms were 17.48%and 16.64%higher than that of control treatment respectively,with significant differences(P<0.05).While the difference between the residual Cu and the control was insignificant.The results indicates that water regulation can decrease exchangeable Cu content in biochar applied soil,reduce biological toxicity of heavy metal in soil,and increase the restoring effect of biochar on heavy metal polluted soil.
作者
张兰
夏红霞
夏洋漪
朱启红
李强
廖偏
ZHANG Lan;XIA Hong-xia;XIA Yang-yi;ZHU Qi-hong;LI Qiang;LIAO Pian(Chongqing Chemical Industry Vocational College,Changshou 401228,Chongqing,China;Chongqing Key Laboratory of Environmental Materials&Remediation Technologies,Chongqing University of Arts and Sciences,Yongchuan 402168,Chongqing,China)
出处
《节水灌溉》
北大核心
2022年第8期53-59,共7页
Water Saving Irrigation
基金
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0317)
重庆市教委资助科研项目(KJQN201801340)。
