Hg^(2+)、Cd^(2+)及其复合胁迫对伊乐藻的毒害  

Toxic harm of Hg^(2+)、Cd^(2+) and their combined stress on Elodea nuttallii.

作　　者：吴振斌[1] 马剑敏[1] 赵强[1] 贺锋[1] 成水平[1] 

机构地区：[1]中国科学院水生生物研究所,湖北武汉430072

出　　处：《中国环境科学》2005年第3期262-266,共5页China Environmental Science

基　　金：国家杰出青年科学基金项目(39925007);国家"十五"重大科技专项(2002AA601021);国家"973"项目(2002CB412300);中国科学院知识创新工程重要方向性项目(KSCX2-SW-102)共同资助

摘　　要：利用水生微宇宙系统研究了不同浓度的Hg2+、Cd2+单一及复合处理对伊乐藻可溶性蛋白质浓度、叶绿素含量、叶绿素a/b比值,以及生产力和呼吸作用的影响.可溶性蛋白质和叶绿素含量在低浓度胁迫时(Hg2+≤2.5μmol/L,Cd2+≤10μmol/L,Hg2++Cd2+≤1.25μmol/LHg2++5μmol/LCd2+)略有升高,之后随胁迫的增强而持续下降,两者呈负相关;叶绿素a/b比值、净生产力、呼吸强度随离子浓度增加不断下降,除呼吸强度外,两者也呈负相关.Hg2+对伊乐藻的毒性是Cd2+的4倍左右(以摩尔浓度计).两者共同作用时,对可溶性蛋白和叶绿素含量以及净生产力的影响有协同效应,对呼吸作用的影响有相加效应.The influence of Hg2+, Cd2+ of different concentrations and their combined treatment on dissoluble protein concentration, chlorophyll content, chlorophyll a/b ratio, productivity and respiration of Elodea nuttallii were studied utilizing aquatic microcosm. Under low concentration stress Hg2+ [less-than or equal to] 2.5 μmol/L, Cd2+ [less-than or equal to] 10 μmol/L and Hg2+ + Cd2+ [less-than or equal to] 1.25 μmol/L Hg2+ + 5 μmol/L Cd2+, the contents of dissoluble protein and chlorophyll increased slightly; and then decreased continuously with increase of the stress with negative correlation. Chlorophyll a/b ratio, net productivity and respiration strength decreased continuously with increase of ion concentration, except respiration strength, also with negative correlation. The toxicity of Hg2+ on Elodea nuttallii was about 4 times more than that of Cd2+ (calculation with μmol/L). Under Hg2+ and Cd2+ combined actions, they revealed synergism effects on dissoluble protein and chlorophyll contents and net productivity; but addition effects on respiration.

关 键 词：HG^2+ CD^2+ 复合胁迫 伊乐藻 

分 类 号：X171.5[环境科学与工程—环境科学]