香樟、君迁子实生苗对土壤Cd^(2+)污染的修复潜力研究

On Remediation Potential of Cinnamomum Camphora and Diospyros Lotus Seedlings on Cd^(2+) Contaminated Soil

以香樟、君迁子一年生实生苗为材料,田间盆栽于含不同质量比Cd^(2+)的土壤中,胁迫处理后,有关生理指标10d测一次,共测5次,120d后测定生长指标及各器官对Cd^(2+)富集量,采用主成分分析和隶属函数法综合评价幼苗对土壤Cd^(2+)胁迫的耐受性以及对土壤Cd^(2+)污染的修复潜能.结果表明:2个树种耐Cd^(2+)性状表现和生理响应不尽相同.据综合得分值,2个树种耐Cd^(2+)性从大到小排序为:香樟(0.711),君迁子(0.396);2个树种所有处理组对Cd^(2+)的积累量从大到小排序均表现为:根,茎,叶,且各器官的富集量随着处理质量比的升高而增大;综合富集系数和转移系数平均值,2个树种地上部对Cd^(2+)富集和转移能力表现从大到小排序为:香樟(0.765,0.844),君迁子(0.357,0.237).香樟在修复Cd^(2+)污染严重土壤具有一定应用潜力,君迁子对土壤Cd^(2+)污染较为敏感,可作为土壤Cd^(2+)污染指示植物.

The remediation potential of potted Cinnamomum camphora and Diospyros lotus annual seedlings has been investigated in this paper under Cd^（2＋）stress in the field,measuring the physiological indexes every 10 days after the Cd^（2＋）stress treatment,total 5 times,measuring the growth index and the concentration of Cd^（2＋）in various organs when the Cd^（2＋）stress treatment lasted 120 days,Cd^（2＋）-tolerance and the remediation potential of soil Cd^（2＋）pollution of the seedlings were evaluated comprehensively by principal component analysis and subordinate function method.The result show that,the character performance and physiological responds of the two tree species to Cd^（2＋）stress are not the same.Cd^（2＋）-tolerance of the two tree species were in an order of Cinnamomum camphora（0.711）Diospyros lotus（0.396）according to the comprehensive score value,the accumulation of Cd^（2＋）in all treatment groups were sequenced as following：root,stem,leaf,and the amount of enrichment of different organs with the increase of Cd^（2＋）concentration increases,in terms of the average of enrichment factor and transport coefficient,the accumulation and transport capacities of Cd^（2＋）in the aboveground parts of the two tree species were in an order of Cinnamomum japonicu（0.765,0.844）Diospyros lotus（0.357,0.237）.The seedlings of Cinnamomum camphora has a certain potential application to repair the soil that was seriously polluted by Cd^（2＋）,while the seedlings of Ginkgo bilobais sensitive to Cd^（2＋）contaminated soil and it can be as an indicator of Cd^（2＋）pollution in serious areas.