镉胁迫对金丝垂柳幼苗生长及叶绿素荧光特性的影响

采用盆栽试验的方法,研究土壤中不同浓度的镉(0、2、20、80 mg·kg-1)胁迫条件对金丝垂柳幼苗的生长、净光合速率(Pn)、光合色素含量及叶绿素荧光参数（Fv/Fm、φPsⅡ和qP）的影响.结果表明:(1)2 mg·kg-1处理组植物的生长、净光合速率及叶绿素荧光参数随着处理时间的增加呈先下降后上升的趋势,说明2...

Effects of cadmium stress on growth and chlorophyll fluorescence characteristics of Salix X aureo-pendula seedlings

In order to reveal the effects of cadmium stress on the growth rate,net photosynthetic rate(Pn),photosynthetic pigment content and chlorophyll florescence parameters(Fv/Fm,ΦPSⅡ and qP) of the young potted Salix×aureo-pendula were determined.The following conclusions were approved:the growth rate,Pn and chlorophyll florescence parameters of the young Salix×aureo-pendula cultured in 2 mg·kg-1 cadumium medium firstly decreased and then increased as time goes by;while they dropped dramatically with the time in 20 mg·kg-1 and 80mg·kg-1 cadmium conditioned soil media.It's concluded that 20 mg·kg-1 and 80 mg·kg-1 but not 2 mg·kg-1 cadmium stress had significant effect on the growth of the young seeding.No changes of the photosynthetic pigment content was detected 40 days after the cadmium stress treatment.However,it increased and decreased in low and high cadmium concentration respectively 90 days after the treatments.Above all,the results suggested that the young potted Salix×aureo-pendula showed the best tolerance and photosynthetic adaptability under 2 mg·kg-1 cadmium stress.