钙镁磷肥和石灰对受Cu Zn污染的菜园土壤的改良作用

Melioration Effect of Calcium Magnesium Phosphate and Calcareousness on Vegetable Garden Soil Polluted by Cu and Zn

采用盆栽试验方法,研究了钙镁磷肥和石灰对受Cu、Zn污染的菜园土壤的改良作用。结果表明,在添加钙镁磷肥和石灰的土壤中,小白菜的生长基本上未受重金属毒害的影响。单一Cu污染、单一Zn污染以及Cu-Zn复合污染的菜园土壤上,小白菜的鲜重随着改良剂钙镁磷肥和石灰用量的增加而显著增加。在单一Cu污染、单一Zn污染以及Cu-Zn复合污染的菜园土壤上,酸碱度随着钙镁磷肥和石灰的施入而变化,土壤的pH随着钙镁磷肥和石灰用量的增加而显著增加。在3种不同污染的土壤上,施用改良剂钙镁磷肥和石灰降低了重金属Cu和Zn的有效性。

Using green Chinese cabbage as material of pot experiment, the effects of calcium magnesium phosphate and calcareousness on melioration of heavy-metal-polluted soil were studied. The results indicated that heavy metals had little influence on the growth of green Chinese cabbage. However, if the vegetable garden soil was polluted by only Cu or Zn and by both Cu and Zn, the yield of fresh green Chinese cabbage increased with the increasing application rates of calcium magnesium phosphate and calcareousness. Compared to the control, grown in vegetable garden soil polluted by Cu and Zn, the yield of green Chinese cabbage increased by 155%～366%, 209%～267%, under three different dosages of calcium magnesium phosphate and calcareousness, 107%～335%and 84%～266%respectively. Acid-base degree of soil polluted by Cu, Zn and Cu-Zn was changed, soil pH increased by 1 unit and 2 ～ 2.5 unit, receptively. The validities of Cu and Zn heavy metals were reduced by applying calcium magnesium phosphate and calcareousness, low or middle dosage of calcareousness should be used to restore vegetable garden soil polluted by Cu. While, in order to restore vegetable garden soil polluted by Zn or Cu-Zn, high dosage of calcium magnesium phosphate or calcareousness should be used to maintain soil pH being about 7, which could reduce the validities of heavy metals obviously.