摘要
以草地早熟禾为研究材料,研究了不同浓度的重金属离子镉(Cd^(2+))、铜(Cu^(2+))和铅(Pb^(2+))对其种子萌发、幼苗生长及光合特性的影响。结果表明:低浓度的Cd^(2+)(10mg·kg-1)和Cu^(2+)(100mg·kg-1)处理时,对草地早熟禾种子萌发有一定的促进作用,发芽率分别达到了96.2%和94.2%,发芽指数分别为9.8和9.7,均高于对照;当Cd^(2+)浓度高于10mg·kg-1、Cu^(2+)浓度高于100mg·kg-1时,种子发芽率和发芽指数均低于对照。当Cu^(2+)浓度低于200mg·kg-1时,随着浓度的增大,幼苗的株高、总根长和地上生物量以及叶绿素含量和Fv/Fm值有一定的增加;当Cu^(2+)浓度高于200mg·kg-1时,随着浓度的增大,则呈下降趋势。而随着Pb^(2+)浓度的增加,草地早熟禾种子的萌发、幼苗的生长及光合效率均逐渐下降,且低于对照。
In the experiment,Poa pratensis L.was selected as the research material,the effect of three different heavy metals ions cadmium（Cd^2＋）,copper（Cu^2＋）,lead（Pb^2＋）and different concentration on seed germination,seedling growth and photosynthetic characteristic systematically were studied.The results showed that in the low concentration of Cd^2＋（10mg·kg^-1）and Cu2＋（100mg·kg^-1）treatments,seed germination of Poa pratensis L.had been promoted in some extent and the seed germination rates reached 96.2% and 94.2%respectively,the germination index were 9.8and 9.7respectively,which were higher than the controls.When the concentration of Cd^2＋was higher than 10mg·kg^-1 or Cu^2＋concentration was higher than 100mg·kg^-1,the seed germination percentage and germination index were lower than the controls.When Cu^2＋concentration was below 200 mg·kg^-1,the seedlings height,total root length,biomass of aboveground and the content of chlorophyll,Fv/Fmvalues had a slight increase along with the increase of concentration.When Cu^2＋concentration was higher than 200mg·kg^-1,significant decline appeared with the increase of concentration.In addition,seed germination,seedling growth and photosynthetic efficiency of Poa pratensis L.declined with the increase of concentration of Pb^2＋,and were lower than the controls.
作者
尹娟
李宁
YIN Juan LINing(Forestry Institute, Xinyang Agroforestry Institute, Xinyang, Henan 464000 Department of Environmental Art Engineering, Henan Vocational and Technical College, Zhengzhou, Henan 450046)
出处
《北方园艺》
CAS
北大核心
2016年第18期61-64,共4页
Northern Horticulture
基金
国家自然科学基金资助项目(31270664)
关键词
草地早熟禾
重金属
萌发
生长
光合特性
Poa pratensis L.
heavy metal
germination
growth
photosynthetic characteristics
