摘要
以长穗偃麦草为材料,采用土培试验方法,研究了重金属Cd、Zn单一及复合污染对长穗偃麦草的生物量、保护酶(SOD和POD)、丙二醛(MDA)、脯氨酸(Pro)的影响,及长穗偃麦草对Cd、Zn的积累能力。结果表明,Cd、Zn单一及复合污染下,长穗偃麦草生物量随Cd和Zn浓度的升高而降低,与对照存在显著差异(P<0.05);Cd和Zn单一污染下,随着Cd、Zn浓度的升高,SOD、POD、MDA、Pro含量增加;Cd和Zn复合污染下,随处理质量浓度的增加,SOD呈下降趋势,POD和MDA呈增加趋势。Cd10Zn200处理下Pro含量减少,随Cd和Zn质量浓度的增加,其他复合处理下的Pro含量增加;植株根部的Cd和Zn积累量均大于地上部的积累量。综合实验结果,可初步判断长穗偃麦草能积累和忍受一定量的Cd、Zn,Cd和Zn复合污染对上述各指标的毒害效应大于同水平单元素污染的效应。长穗偃麦草根茎发达,生物量大,在生长过程中可通过生物量带走部分重金属Cd、Zn,因此长穗偃麦草具有修复重金属Cd和Zn污染土壤的潜能。
The effects of individual and combined pollution of cadmium （Cd） and zinc （Zn） on the biomass, the antioxidant enzymes （super oxide dismutase, SOD and peroxidase, POD ）, the malondialdehyde（MDA） and the proline（Pro ） of Elytrigia elongata, and its accumulation a- bilities for Cd and Zn were measured and analyzed using the soil potted culture experiment methods. The results showed that the biomass of E. elongata decreased with the increase of Cd and Zn concentration under the individual and combined pollution of Cd and Zn, and their biomass had significant differences compared with the control（P〈0.05 ）. The contents of SOD, POD, MDA and Pro increased with the increase of Cd and Zn concentration under the individual Cd or Zn pollution. The content of SOD showed the decrease trend, POD and MDA showed the increase trend with the increase of Cd and Zn concentration under the combined Cd and Zn pollution. The content of Pro decreased at the combined pollution of Cd （l0 mg. kg-1） and Zn （200 mg· kg-1 ）, while the Pro increased with the increase of Cd and Zn concentration at the other combined pollution treatments. The accumulation contents of Cd and Zn in roots were significantly higher than the ones in shoots. The results of the present study suggestted that E. elongata was able to accumulate and tolerate in a certain amount of Cd and Zn, and the tox- ic effects of Cd and Zn combined pollution were greater than the ones of individual Cd or Zn pollution at the same levels. In a conclusion, the E. elongata has a promising remedial potential for the light or middle levels of Cd and Zn contamination soil, because it has the well-devel- oped rhizome and huge biomass which has the absorbing and accumulation function for Cd and Zn from the contaminated soil
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第8期1483-1490,共8页
Journal of Agro-Environment Science
基金
北京市农林科学院科技创新能力建设专项(KJCX201101003)
农业部牧草种质资源保护项目
关键词
长穗偃麦草
重金属
镉
锌
土壤污染
Elytrigia elongata
heavy metal
cadmium
zinc
soil pollution
