土壤铜铅锌复合污染对水稻的生态效应

Ecological Effects of Combined Cu, Pb and Zn Soil Pollution on rice Production.\

采用４水平３因子正交试验设计，通过盆栽试验，用添加法研究了铜、铅、锌及其复合污染的红壤性水稻土对水稻生长、产量、品质的综合影响。结果表明，当土壤受铜、铅、锌单一污染时，三元素对水稻的危害作用依次为锌＞铜＞铅；当土壤中铜、铅、锌都存在时，三元素之间具有协同危害作用，其危害作用依次为铜－铅＞铅－锌＞铜－锌。为使生态环境中食物链不受污染，提出了铜、铅、锌复合污染情况下红壤性水稻土中铜、铅、锌的临界限值为５３、３０５和１６５ｍｇ／ｋｇ。

\ Comprehensive effects of Cu, Pb and Zn in Soil on growth, yield and quality of rice have been studied through a series of pot culture experiments with a 4 level and 3 factor orthogonal design. The results of the experiments showed that when soil is polluted by single factor of Cu, Pb or Zn individually, the order of damages in terms of seriousness was Zn>Cu>Pb; when Cu, Pb and Zn were added togather into the soil with different combinations, the order of cooperative damages in terms of seriousness was Cu-Pb>Pb-Zn>Cu-Zn. In order to prevent the food chain from heavy metal pollution in eco environment, the critical values of 53, 305 and 165 mg/kg for Cu, Pb and Zn in soil respectively are suggested in the condition of combined Cu, Pb and Zu soil pollution.