The Growth And Physiological Response Of Three Willows To Heavy Metal Cadmium Stress

In recent years, cadmium pollution is increasingly serious which pose threat to people health and daily life. The use of phytoremediation method to decrease the cadmium pollution is more and more favorred. Macrophanerophytes which is strong adaptability, big biomass, not connecting to the food chain, not producing secondary pollution, etc, played an extremely important role in phytoremediation. The willows (Salix) with the advantages like fast growth, large root system, big biomass, adaptablity, easy to promotion, high ornamental value, etc, makes willow to be the tree species that is very suitable for cadmium stress bioremediation. The three kinds of willows studied in this paper equiped with some of the good quality above which is suitable for application in soil restoration. It can also be used for scenic forests, forests for timber and other purposes like pleasant economic value which can be used for ornamental forrest after the repairation.the response of willow to heavy metal cadmium stress was explored. Related morphological index, photosynthetic physiological indexes and antioxidants and antioxidant enzyme system of potted salix Integra, salix ’zhuliu’, salix’ jinzhiliu’at cadmium stress concentration 50 mg/kg and 100 mg/kg and 150 mg/kg were studied. The main results were as follows:The morphological index, photosynthetic physiological indexes and antioxidants and antioxidant enzyme system of willow was accelerated under the 50 mg/kg treatment. With the increasing of the concentration, inhibiting effect to the photosynthetie physiological indexes and antioxidants and antioxidant enzyme system of willow appeared and rise.