植物多酚物質原位鈍化污染土壤重金屬的研究Ⅱ.對土壤Cu環境行為和生物活性的影響動態

通過室內好氣培養和生物盆栽試驗研究了縮合類植物多酚L和Y以及8羥基喹啉在污染紅壤和潮土中的降解動態及其對土壤Cu環境行為的影響。結果表明植物多酚在兩周內降解相對較快，而8羥基喹啉則難以降解.與空白相比，Cu污染土壤中施用植物多酚後土壤水溶性Cu顯著下降，鈍化Cu的效果次序為:8羥基喹啉>多酚Y>多酚L。隨著植物多酚的降解，土壤Cu被釋出，其水溶性Cu濃度與殘留在土壤中多酚濃度（以DOC濃度表示）呈負相關關係，尤其在潮土上更為明顯，而pH與水溶性Cu沒有相關性。試驗還發現，鈍化劑施用後，小麥體內的Cu含量降低，因此，植物多酚是鈍化重金屬污染土壤的良好選擇。
The decomposing dynamics of condensed plant polyphenol L、Y and 8-hydroxyquinoline and copper environmental behavior in acidic and calcareous soils were studied by aerobic incubation and pot experiment. The results showed that plant polyphenols decomposed more quickly in two weeks after applied than 8-hydroxyquinoline. The decomposition rate of polyphenol L、Y and 8-hydroxyquinoline was 65.3%、37.8% and 27.0%, respectively. In comparison with the control, concentration of water-soluble copper was decreased significantly ,which concentration was 0.248-0.316 times in acidic soil and 0.063-0.276 times in calcareous soil as that of control. So the stability of different treatments were as follows: 8-hydroxyquinoline>polyphenol Y>polyphenol L. Cu was released with the decomposition of plant polyphenol. It was found that copper content had a negative correlation with that of plant polyphenol, especially in calcareous soil. However, it was found that there was no linear correlation between the concentration of soluble copper and pH. It can also be obtained that copper contents in wheat were dropped by 1.01%-58.5% in acidic soil and by 13.8%-33.6% in calcareous soil with plant polyphenols added. Therefore, plant polyphenols are good selection for stabilizing heavy-metal contaminated soils. Copyright © 2003 科學出版社.