The Response Of Physicology And Absorpation Of Moso Bamboo(Phyllostachys Pubescens) Under The Heavy Mental Stress

Heavy metal contamination of land and water resource is a serious problem affecting the environment and human health in many countries of the world. Both hydroponic and pot experiments were conducted during present studies to investigate systemically the heavy mental uptake mechanism, physiological responses under heavy mental toxicity. The main results were as follows:1. In present paper the seeds of moso bamboo are taken as test materials, the toxicity effects of four heavy metals involving Pb2+, Zn2+, Cu2+ and Cd2+ on seed germination and its accumulation of heavy metals were studied. The results indicated that:(1) The addition of Pb2+ and Cd2+ inhibited the germination rate, germination energy, germination index and vigor index of moso bamboo seed significantly. For the low treatment level of Cu2+ and Zn2+, the germination rate, germination energy, germination index and vigor index increase significantly, while the results were on the contrary for the high treatment level. When the treatment dosage reached to 1600 μmol L-1, the Cd2+ addition has strong inhibition on seed germination than other three heavy metals.(2) The addition of low levle of Pb2+ and Zn2+ would promote the root growth significantly, while with the stress of Cu2+ and Cd2+ the root morphology are inhibited.(3) The concentration of Pb2+, Zn2+, Cu2+ and Cd2+ in shoots of moso bamboo reached 6810.51, 1387.77, 951.77 and 429.33 mg kg-1 respectively after treating for 10 d. The translocation factor dimension is Zn2+>Cd2+>Pb2+>Cu2+.2. Moso bamboo was studied through hydroponic experiment of heavy metal(Pb, Zn, Cu, Cd). We mainly studied its physiological reaction, absorption characteristics and changes in cell internal structure.Under copper and cadmium treatment, moao bamboo biomass have appeared the general trend of reducing, with the increase of the concentration of heavy metals. While under lead and zinc processing, moso bamboo biomass showed the similar to the control in the growth of the situation at first, and then reduced.And for the moso bamboo cell tissue especially organelles, it was not consistent that the different heavy metals caused the damage.Because of the damage of leaf cell tissue especially organelles membrane, moso bamboo photosynthesis and metabolism slows, leading to the stop of the moso bamboo’s growth.3. Through soil culture experiment, we could learn that the effects of heavy metals(lead, zinc, copper and cadmium) on moso bamboo growing, the ability of moso bamboo absorbing and transferring heavy metals, and the potential of fixing the soil heavy metal. Moso bamboo has higher tolerance to the lead and zinc, compared with copper and cadmium. As a result, moso bamboo had stronger stems, thick dark green leaves and grew more prosperous.In the lead, zinc and copper contaminated soil, moso bamboo biomass increased at first and then decreased. While biomass had continued to decline in cadmium polluted soil. As to moso bamboo absorbing and transferring heavy metals, zinc and cadmium is greater than the lead and copper. On heavy metal contaminated soil repair, meanwhile, moso bamboo has great potential. Because moso bamboo has unique biological properties, ability to reproduce, and the adaptability which is better than that of woody plants, although moso bamboo is not super accumulation of plants.