不同改良剂处理对玉米生长和重金属累积的影响

Effects of Different Amendments on Corn Growth and Accumulation of Heavy Metals

采用土壤盆栽实验研究不同改良剂对玉米吸收和积累重金属的影响。结果表明,大多数改良剂处理均显著地提高玉米的地上部鲜重和总鲜重。添加改良剂可显著地降低土壤Cd、Pb、Cu和Zn的有效态含量。与CK处理相比,添加不同改良剂导致土壤有效态Cd含量降低4.8%～16.5%,有效态Pb含量降低10.6%～15.5%,有效态Cu含量降低4.5%～26.7%和有效态Zn含量降低2.8%～7.6%,其中骨炭、骨炭+赤泥和Al(2SO4)3改性骨炭处理降低效果最明显。改良剂的添加对玉米吸收和积累Cd、Pb、Cu和Zn产生不同程度的影响。与对照相比,不同改良剂处理均显著地降低玉米叶片中的Cd含量27.5%～62.2%,骨炭+赤泥、海泡石、沸石和天然骨炭处理分别降低玉米茎中Pb含量46.7%、55.6%、59.0%和74.0%。同样,改良剂对玉米植株Cu和Zn含量的影响也表现出相类似的规律。玉米转运重金属也受改良剂添加的影响。

Effects of different amendments on corn growth and accumulation of heavy metals were carried on by using pot experiment in greenhouse.The results showed that most of amendment treatments could increase the total fresh weight of corn and fresh weight of shoots.Addition of different amendments could significantly decrease the available content of Cd,Pb,Cu and Zn in soil.Compared to the control treatment,addition of different amendments led to a decrease of available Cd content in soil by 4.8%～16.5%,available Pb by 10.6%～15.5%,available Cu by 4.5%～26.7%,and available Zn by 2.8%～7.6%.Additions of natural bone char,bone char＋ red mud and Al（2SO4）3 modified bone char were the most available treatments to decrease the available content of heavy metals in soil.At the same time,concentrations of Cd,Pb,Cu and Zn in shoots and roots of corn decreased by adding most amendments.Compared to the control treatment,all of the amendment treatments decreased the concentration of Cd in corn leaf by 27.5%～62.2%,and the concentration of Pb in corn stem decreased by 46.7%,55.6%,59.0% and 74.0% respectively,by adding bone char＋red mud,sepiolite,zeolite and natural bone char in contaminated soil.Effects of amendments on the transport of heavy metals by corn were also studied.