施用不同叶面调理剂对轻度重金属污染农田的影响

Effects of Different Leaf Conditioners on Farmland Slightly Polluted by Heavy Metals

【目的】比较不同调理剂对轻度重金属污染农田修复效果,筛选出适用玉米叶面调理剂。【方法】选择天象阻控剂、降镉灵、镉盾、海中钙+海中素、镉无忧5种叶面调理剂进行试验,测定其对土壤pH、土壤和玉米籽粒重金属(Cd、Hg、Pb、As和Cr)含量、玉米产量的影响。【结果】镉无忧处理显著增加了土壤pH,而其他几种调理剂处理影响不显著;5种调理剂降低了土壤中镉、汞、砷的含量,最大降低了39.5%;5种调理剂降低了玉米籽粒中镉含量,降低幅度在16.8%~32.7%间;降镉灵、镉盾和海中钙+海中素处理组玉米产量分别较对照增加了5.3%、3.2%和1.1%。【结论】镉盾处理降低了土壤中的5种重金属含量和玉米籽粒中的3种重金属含量,是供试的5种叶面调理剂中效果最全面的;降镉灵处理,使土壤及玉米籽粒中镉含量分别降低了39.6%和32.7%,是供试的5种叶面调理剂中降镉效果最好的;叶面调理剂对玉米有增产作用。

【Objective】The effects of different conditioners on the remediation of light heavy metal contaminated farmland were compared,and the suitable corn leaf conditioners were selected.【Methods】Five leaf conditioners were selected to test their effects on soil pH,content of heavy metals(Cd,Hg,Pb,As and Cr)in soil and corn seed,and corn yield.【Results】Cadmium free treatment significantly increased soil pH,while other treatments had no significant effect;The contents of Cd,Hg and As in the soil were decreased by 39.5%at most;The decrease of the contents of Cd in corn grains ranged from 16.8%~32.7%with 5 kinds of conditioning agents;Compared with the control,the corn yield of the treatment groups of Jiang ge ling,Cadmium Shield and Hai zhong gai+Hai zhong su increased by 5.3%,3.2%and 1.1%respectively.【Conclusion】Cadmium shield treatment reduced the contents of five heavy metals in soil and three heavy metals in corn grain,which was the most comprehensive among the five leaf conditioners tested;The cadmium content in soil and corn grain decreased by 39.6%and 32.7%respectively under the treatment of Jiang ge ling,which was the best among the five leaf conditioners tested;Leaf conditioners can increase the yield of corn.