摘要
测定了高羊茅和翦股颖两种草坪植物在Cu、Pb污染下发芽率、叶绿素、净光合速率和SOD的变化,以及两种草对Cu、Pb的吸收.结果表明,重金属污染对高羊茅种子的萌发产生显著影响.高浓度Pb污染以及Pb、Cu复合污染对高羊茅的叶绿素影响很大,Cu单独污染对高羊茅叶绿素的抑制作用较小.翦股颖的叶绿素变化不显著.在3个Pb处理及350mg.kg-1Cu处理下,翦股颖的SOD活性均高于对照,而只有在700mg.kg-1Pb和350mg.kg-1Cu+1100mg.kg-1Pb处理下高羊茅的SOD活性才升高.高羊茅的净光合速率受Cu污染影响较小,而受Pb污染影响较大.在Cu、Pb单独污染条件下,翦股颖净光合速率均呈下降趋势.从生理角度来看,翦股颖对Cu、Pb污染的耐受性强于高羊茅,而高羊茅对Cu污染的耐受性强于Pb.高羊茅Cu吸收量大,但Cu吸收量不随污染浓度升高而升高.翦股颖对土壤Pb的吸收能力较强,且Pb吸收量随污染浓度的增加而增加.翦股颖和高羊茅可分别用于Pb和Cu污染土壤的治理.
This paper studied the seed germination rate, chlorophyll content, net photosynthetic rate, SOD activity, and Cu and Pb absorption of Agrostis stolonifera and Festuca arundinacea under Cu and Pb pollution. The results showed that Cu and Pb pollution had a significant effect on the seed germination rate of F. arundinacea. The chlorophyll content of F. arundinacea decreased dramatically under Pb and Cu-Pb pollution, while decreased slightly under Cu pollution. No significant effect of Cu and Pb was observed on the chlorophyll content of A. stolonifera. The SOD activity of A. stolonifera increased under 350 mg Cu·kg^-1 and all test concentrations of Pb, while that of F. arundinacea only increased under 700 mg Pb·kg^-1 and 350 mg Cu·kg^-1 ＋ 1 100 mg Pb·kg^-1. The net photosynthetic rate of F. arundinacea decreased more under Pb pollution than under Cu pollution, but that of A. stolonifera all decreased under Cu or Pb pollution. It was suggested that A. stolonifera was more tolerant in physiological characteristics to Cu and Pb pollution than F. arundinacea, while F. arundinacea was more tolerant to Cu than to Pb. The Cu absorption amount of F. arundinacea was relatively large, but did not increase with increasing Cu pollution. A. stolonifera had a high absorption ability of Pb, and the absorbed Pb amount was increased with increasing Pb pollution. A. stolonifera and F. arundinace could be the potential phytoremediation plants for Pb and Cu-polluted soil, respectively.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第3期625-630,共6页
Chinese Journal of Applied Ecology
基金
辽宁省科学技术厅博士启动基金项目(20031029)
国家自然科学基金项目(30570445)
沈阳师范大学博士启动基金
沈阳师范大学主任基金
沈阳师范大学环境科学学科建设资助项目.
关键词
重金属污染
草坪植物
耐受性
吸收
heavy metal pollution
lawn grass
tolerance
absorption.
