不同磷营养水平对2种沉水植物在Cd·Zn复合污染下的影响  

Effects of Different Phosphorus Concentrations on Two Submerged Plants under Combined Pollution of Cd,Zn

作　　者：张慧[1,2] 王超[1,2] 王沛芳[1,2] 薛艳[1,2] 

机构地区：[1]河海大学环境科学与工程学院,江苏南京210098 [2]河海大学环境科学与工程学院浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《安徽农业科学》2011年第3期1654-1658,1661,共6页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金面上项目(No.40871227);国家自然科学基金重点项目(No.50830304)

摘　　要：[目的]揭示富营养化和重金属污染共同存在时对沉水植物的影响,为水生生态系统的健康评价和治理提供理论依据和手段。[方法]比较研究了不同磷营养水平对Cd、Zn复合污染下伊乐藻(Elodea nuttallii)、黑藻(Hydrilla verticillata)2种沉水植物叶绿素含量和叶绿素a/b比值、MDA含量、GSH含量、POD活性、CAT活性等生理生化指标的影响。[结果]随着培养时间延长,2种植物的叶绿素含量基本呈下降趋势,MDA含量呈先上升后下降趋势,POD活性及可溶性蛋白含量呈先下降后上升趋势,GSH呈缓慢上升趋势,当不存在磷水平时CAT活性无明显变化;但是黑藻比伊乐藻对胁迫更敏感,并且耐性优于伊乐藻。[结论]不同磷营养水平对受重金属胁迫植物的影响不一样,其中低磷水平(0.05 mg/L)可在一定程度上缓解重金属的毒害,与重金属产生拮抗作用;而高磷水平(5 mg/L)则加重了重金属对植物的伤害,产生协同作用。[ Objective ] The aim was to reveal effects of eutrophication on two kinds of submerged plant under heavy metal contamination, thus to provide theoretical basis for health evaluation and treatment measures of aquatic ecosystems. [ Method ] The effects of different phosphorus levels on the chlorophyll contents and a/b values of Elodea nuttallii and Hydrilla verticillata were compared and investigated. [ Result] With the culture time prolonging, the chlorophyll contents of the two kinds of plant showed a general decreasing tendency ; MDA content was first increased and then decreased; POD activity and soluble protein content were first decreased and then increased; GSH showed a slow upward trend ; there was no significant change in CAT activity when no phosphorus existed ; in addition, Elodea nuttallii had better sensitivity and tol- erance to the stress than Hydrilla verticillata. [ Conclusion ] Effects of different phosphorus levels on the plants under heavy metal stress differed, in which, low phosphorus level （0.05 mg/L） could alleviate heavy metal poisoning to some extent, and generate heavy metal antagonism, and high phosphorus level could increase damage of heavy metals on plants, and produce synergies.

关 键 词：CD Zn 磷营养 伊乐藻 黑藻 生理生化 

分 类 号：X173[环境科学与工程—环境科学]