Abstract: In a sand culture experiment, Bruguiera gymnorrhiza seedlings were treated with Hoagland nutrient solution containing different concentrations of CdCl₂. After two months later, the lipid peroxidation, chlorophyll content, and activities of peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) and their isoenzymes in the seedlings were analyzed. The results showed that Cd induced the peroxidation of membrane lipid, resulting in a significant decrease of chlorophyll content. Cd mainly affected the activities of the POD isoenzymes with negative ions and higher mobility, and 1 mmol Cd·L^-1 could significantly inhibit the activities of CAT isoenzymes RC₁ and RC₂ in the root. It was suggested that the analysis of POD isoenzyme in B. gymnorrhiza leaf and of CAT isoenzyme inB. gymnorrhiza root could be used to monitor the Cd pollution of mangrove.

Key words: Forest inventory data, Forest biomass, Model