Effects of Combined Modifier on Lead Accumulation and Nutritional Quality of Cucumber

In order to verify remediation effect of combined modifier on lead contaminated of cucumber soil，pot experiments were carried out to study the effects of different combinations of modifiers on soil physical and chemical properties，microbial community structure，lead accumulation and nutrient quality in cucumber fruit in two lead contaminated soils.Results showed that after applying combined modifiers，the organic matter contents，bacterial numbers，actinomycetes numbers，and total microorganism amounts of the 800 mgkg and 1 200 mgkg of lead polluted soil increased by 34.02% and 25.96%，5.25 times and 4.93 times，17.86% and 233.33%，and 2.72 times and 4.32 times，respectively.However，applying modifier had no significant effect on pH of soil.Moreover，after applying combined modifiers，lead and crude fiber contents in cucumber fruits planted in the 800 mgkg and 1 200 mgkg of lead polluted soil decreased by 54.85% and 30.17%，and 24.59% and 23.61%，respectively.Furthermore，contents of vitamin C，soluble sugar，and soluble fixation of cucumber fruits largely improved.Therefore，security and nutritional quality of fruit of cucumber planted in lead polluted soil obviously improved comparing with no modifier application.Test results indicated that combined modifiers could be used in the in situ repair of lead polluted soil.