组配改良剂对黄瓜铅积累及营养品质的影响

为验证组配改良剂对铅污染黄瓜土壤的修复效果，通过盆栽试验研究两种浓度铅污染土壤中不同组配改良剂施用量对土壤理化性质、微生物群落结构、黄瓜果实中铅积累量和营养品质的影响。结果表明，800、1 200 mgkg两种浓度铅污染土壤施用组配改良剂后，土壤有机质含量分别增加34.02%和25.96%，土壤细菌数量分别增加5.25倍和4.93倍，放线菌数量分别增加17.86%和233.33%，微生物总量分别增加2.72倍和4.32倍，但对土壤pH值无显著影响。施用组配改良剂后，两种浓度铅污染土壤黄瓜果实铅含量分别降低54.85%和30.17%，粗纤维含量分别降低24.59%和23.61%，维生素C含量分别增加59.52%和42.16%，并显著提高黄瓜果实中可溶性糖及可溶固形物含量，黄瓜果实的食用安全性和营养品质显著提升，说明该组配改良剂对铅污染土壤具有较好的修复效果。 

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.