Abstract: With alfalfa as a testing plant growing in pots of Cd-contaminated soil, the effect of chlorophyll and solublesugar of different stubble is studied with Cd²⁺ stress in different doses. The result shows that the contents of chlorophylland soluble sugar change as converse'N' with heavy metal doses increasing, viz. as the rule of falling-rising-falling. Thisstress mechanism may be related with recovery system of alfalfa because of heavy metal inducing.The contents of solublesugar of three stubbles are different, as follows: the first stubble> the second stubble> the third stubble. On the otherhand, the contents of chlorophyll of three stubbles are different, as follows: the second stubble> the first stubble> thethird stubble at low concentration; the second stubble> the third stubble> the first stubble at high concentrat ion. Themajor reason of the result either may be lost Cd and weakened stress because alfalfa is reaped, or may be mult-i factor actone another.

Key words: Cadmium stress, Alfalfa, Chlorophyll, Soluble sugar, Recovery mechanism

CLC Number: 

• S541.9