The Study Of Plant Communities And Dominant Plants Response To Cadmium In Liaoning Lotus Lake Wetland

In this article, the types of plant communities were studied in the area of LotusLake wetland. In support of BioDiversityPro software, the biodiversity indexes ofdifferent communities were analyzed. The dominant plants, Polygonum orientale L.and Typha orientalis Pres.l, in the region were filtered out.The response of Polygonum orientale and Typha orientalis under the stress ofdifferent concentrations of Cd were studied. The changes of vivo antioxidant enzymesystem and malondialdehyde content were measured. The accumulation andtransformation of Cadmium in the plants were also studied.The main findings were as follows:1. There are12kinds of community types in Tieling Lotus Lake wetland,including eight kinds of terrestrial plant communities, four kinds of aquatic plantcommunities. The most dominant communities were Polygonum orientale communityand Typha orientalis community. They played important ecological function both inthe purification of water and landscape features.2. Under Cadmium stress, the activities of SOD, POD and CAT in Typhaorientalis were higher than in Polygonum orientale. But MDA content in Typhaorientalis was lower than the in Polygonum orientale. The tolerance ability of Typhaorientalis to cadmium stress was higher than Polygonum orientale.3. There was a significant positive correlation between cadmium stress level andthe contents in the2dominant plants. The acumulation indexes of two plants wereboth greater than1.But the acumulation indexes Typha orientalis were higher thanPolygonum orientale. The transformation coefficients of two plants were both lessthan1.But the transformation coefficients of Typha orientalis were lower thanPolygonum orientale.By studying the two dominant plant response to cadmium and cadmiumabsorption, the findings can be drawn, the damage of Typha orientalis was smallerthan Polygonum orientale under Cd stress. Two species could be planted in thewetlands to accumulate, purification of cadmium pollution in the environment, Typhaorientalis was better than Polygonum orientale.