中文摘要：

以大豆东农42和47为试验材料，采用盆栽方式，使用乙醇分光光度计法研究在大豆开花期喷施不同浓度稀土元素La（Ⅲ）和ce（Ⅲ）（RE1／60mg·L-1，RE2／90mg·L-1，RE3／120mg·L-1。和RE4／150mg·L-1）对叶片叶绿素含量（Chl）的影响。结果表明：与对照组（CK）相比，La对两种大豆Chl含量呈现“低促高抑”的现象：在REl浓度下，Chl含量高于CK值，并且达到最大值，随着浓度增大，促进作用降低，抑制作用明显，RE2～RE4 浓度下Chl含量降低，并且低于cK值；Ce对两种大豆Chl含量呈现下降趋势，在RE1浓度下下降幅度最为明显，RE2～RE。浓度下叶绿素含量有所上升并低于CK值。

英文摘要：

Soybean Dongnong number 42 and 47 were used for experiment materials with planting in the pot. The effect of La3＋ and Ce3＋ among different concen- trations （REJ60 mg-L-1, REJ90 mg-L-1, RE3/ 120 mg-L-1 and RE4/150 mg-L-1） on chlorophyll content in soybean flowering period was studied using ethanol spectrophotometer method. The results showed that compared with CK, La promoted two kinds soy- bean chlorophyll content （Chl） under low concentra- tion and inhibited Chl content under high concentra- tion： under RE1 treatment, chlorophyll content is higher than CK and to be maximize, Along with the increasing concentration, promotion was to reduce, in- hibition was obvious, Chl content was lower than CK under RE2 ＋ RE4 treatment; Ce reduced two kinds soybean chlorophyll content, and Chl content de- creased most significantly under REx treatment, and increased under REz - RE4 treatment and was lower than CK.