摘要
为了探究施用生物炭后土壤性质和重金属形态随时间变化过程,通过5种矿区土壤的玉米(Zea mays L.)盆栽实验,研究施用生物炭后土壤和孔隙水性质、梯度扩散薄膜(diffusive gradients in thin films,DGT)技术测定的Zn浓度(CDGT-Zn)和欧共体标准物质局共识(Bureau of Community right-to-know,BCR)有效态Zn含量(弱酸提取态Zn^(+)可还原态Zn,C_(BCR-Zn))随时间变化的过程。施用生物炭后,随土壤培养时间的增加,土壤阳离子交换量(cation exchange capacity,CEC)增加了20.35%~65.65%,孔隙水pH上升0.34~1.02个单位,溶解性有机碳(dissolved organic carbon,DOC)浓度CDOC先升后降,最终下降了8.21%~33.23%,孔隙水Zn浓度(C_(pw-Zn))下降了17.46%~49.67%,C_(DGT-Zn)、C_(BCR-Zn)分别下降了18.64%~50.00%、23.33%~64.71%。随玉米栽培时间的增加,土壤CEC增加了7.94%~28.97%,C_(DOC)、C_(pw-Zn)、C_(DGT-Zn)、C_(BCR-Zn)分别下降了10.43%~41.26%、9.62%~34.21%、10.42%~30.70%、14.68%~61.62%,孔隙水pH无明显变化。生物炭能明显改变土壤和孔隙水性质,降低Zn的生物有效性,从而降低土壤中过量Zn对玉米的危害。
To investigate the changes of soil properties and heavy metal forms over time after the application of biochar,through pot experiments of corn(Zea mays L.)in soils taken from five mining areas,the variations in the soil and pore water properties over time after biochar application were investigated.Meanwhile,the concentration of Zn(C_(DGT-Zn))determined by diffusive gradients in thin films(DGT)technology and the content of available Zn(Zn in weak acid extractable fraction and reducible fraction,C_(BCR-Zn))determined using the BCR method were also examined over time.After the application of biochar,with the increase in the soil incubation time,the soil cation exchange capacity(CEC)increased by 20.35%~65.65%,and the pH of the pore water in the soils increased by 0.34~1.02 units.The dissolved organic carbon(DOC)concentration(C_(DOC))increased first and then decreased over time,and finally decreased by 8.21%~33.23%.The Zn concentration in the pore water(C_(pw-Zn))decreased by 17.46%~49.67%,the C_(DGT-Zn) decreased by 18.64%~50.00%,and the C_(BCR-Zn) decreased by 23.33%~64.71%.As the cultivation time of corn increased,the CEC of the soils increased by 7.94%~28.97%,the C_(DOC) decreased by 10.43%~41.26%,the C_(pw-Zn) decreased by 9.62%~34.21%,the C_(DGT-Zn) decreased by 10.42%~30.70%,and the C_(BCR-Zn) decreased by 14.68%~61.62%.The pH of the pore water does not show a substantial change.Biochar can significantly change soil and pore water properties and reduce the bioavailability of Zn,thus reducing the harm of excess Zn in soil to corn.
作者
梁小凤
罗子健
翁瑕
黄虎臣
林海英
王维生
LIANG Xiaofeng;LUO Zijian;WENG Xia;HUANG Huchen;LIN Haiying;WANG Weisheng(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;School of Pharmacy,Guangxi University of Chinese Medicine,Nanning 530200,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2023年第4期1009-1018,共10页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金项目(22166006)。
