Pb·Cd单一及复合胁迫下桂花幼苗的吸收积累特性研究  

Characteristics of Pb and Cd Uptake and Accumulation in Osmanthus fragrans(Thunb.) Lour.under Single and Combined Stress of Pb and Cd

作　　者：王飞[1] 胥焘[1] 郭强[1] 聂小倩[1] 梅朋森 黄应平[1] 

机构地区：[1]三峡库区生态环境教育部工程研究中心三峡大学,湖北宜昌443002 [2]宜昌市林业局,湖北宜昌443002

出　　处：《安徽农业科学》2012年第31期15214-15218,共5页Journal of Anhui Agricultural Sciences

基　　金：国家十一五水专项(2009ZX07104-003);十二五水专项(20-12ZX07104-002-04);湖北省高等学校优秀中青年科技创新团队项目(T200703)

摘　　要：[目的]为了探讨Pb、Cd单一及复合胁迫下桂花幼苗的吸收积累特性。[方法]采用土壤盆栽试验法,以桂花幼苗为对象,选择重金属Pb在浓度梯度0、50、100、500、1 000和2 000 mg/kg,Cd在浓度梯度0、1、10、50、100和200 mg/kg条件下,研究了不同浓度Pb、Cd单一及复合胁迫对桂花幼苗生长的影响。[结果]在试验条件下,土壤Pb含量达到500 mg/kg时显著抑制桂花幼苗的生长,土壤Cd含量达到100 mg/kg时显著抑制桂花幼苗的生长。桂花幼苗各部分对Pb吸收量的大小顺序为根>茎>叶,对各部分Cd含量的大小顺序为根>茎>叶,但是各部分对Cd吸收量的大小顺序为茎>根>叶。[结论]在复合胁迫下,低浓度Pb、Cd处理表现出相互促进吸收积累,高浓度处理表现出相互抑制吸收积累的特性。[Objective] This study aimed to investigate the characteristics of Pb and Cd uptake and accumulation in Osmanthus fragrans（Thunb.） Lour.under single and combined stress of Pb and Cd.[Method] Pot experiment was adopted with O.fragrans seedlings as experimental materials to investigate the effect of single and combined stress of Pb and Cd on the growth of O.fragrans seedlings under 0,50,100,500,1 000 and 2 000 mg/kg Pb and 0,1,10,50,100 and 200 mg/kg Cd.[Result] Under the experimental conditions,the growth of O.fragrans seedlings was significantly inhibited under moderate Pb stress（500 mg/kg） and high Cd stress（100 mg/kg）.The decreasing order of Pb uptake rate of different O.fragrans tissues was root stem leaf.The decreasing order of Cd content of different O.fragrans tissues was root stem leaf,while the decreasing order of Cd uptake rate of different O.fragrans tissues was stem root leaf.[Conclusion] Under combined stress,low concentrations of Pb and Cd can mutually promote the uptake and accumulation,while high concentrations of Pb and Cd can mutually inhibit the uptake and accumulation.

关 键 词：PB CD 桂花 积累 复合胁迫 

分 类 号：S685.13[农业科学—观赏园艺]