各种改性剂对重金属迁移、积累影响的研究

Effect of various modifiers on migration and accumulation of heavy metals

采用盆栽实验．研究了在不同改性措施条件下，Ｃｄ、Ｐｈ、Ｃｕ、Ｚｎ、Ａｓ多元素复合污染物对水稻、大豆生长的影响及重金属在土壤－作物系统中迁移、积累的特性．结果表明，作物根系中的离子冲量越大，对作物危害越重．酸处理对作物生长影响较大，而腐殖酸和石灰处理有利于作物的生长．改性剂对重金属迁移能力影响大小依次为酸＞腐殖酸＞石灰．作物的不同部位对重金属吸收的顺序为根＞茎叶＞籽实．重金属在土壤－作物系统中的迁移能力为Ｃｄ＞Ｚｎ＞Ｃｕ＞Ａｓ＞Ｐｂ．

The effect of combined pollutants Cd,Pb,Cu,Zn and As on rice and soybean growth and their migration and accumulation in soil -plant system under different modifying measures are studied with pot experiment. The results show that the greater the ionic impulsion in crop roots.the heavier the damage to crops is.Acid treatment inhibits crop growth,and treatment with lime and/or humic acid is of advantage to it.The effect of modifiers on migration of heavy metals is in order of acid>humic acid>lime,and the absorption of heavy metals by crops is in order of root>stem and leaf>grain.The migration of heavy metals in soil-plant system decreases in order of Cd>Zn>Cu>As>Pb.