Effect Of Acid Rain And Pb～(2+),Al～(3+) On Pinus Massoniana Seedlings

The article dealed with experiments on Pinus massoniana . Different schematic design was used by treatments of single acid rain or A1³⁺ or Pb²⁺ or acid rain and AI³⁺ complication polluted or acid rain and Pb²⁺ complication pollouted. we discussed the mechanisms of injury and resistance of Pinus massoniana under the different treatments by studied germinate and growth of Pinus massoniana seeds ,genetic damage and Ag-NORs of root top cells of meristem zone, in part of index of physiology and biochemistry and the form of A1³⁺ or Pb²⁺ absorbed and accumulated. The results showed that Pinus massoniana could acclimatize broad pH range. In acid rain pollutions, heavy metal ions are main toxic reason, and acid rain can enhance toxicide of it. The toxicide induced by Al³⁺ is more serious than Pb²⁺. It might relate to existent form of heavy metal ions in Pinus massoniana. Al³⁺ mainly exist as free state, and easy be actived by acid rain, so it would increase content of actice oxygen in cells, enchance effect of membrane lipid .It might be one of important mechanisms for Pinus massonian under acid rain and Al³⁺ complication pollouted. Pb²⁺ is inert, the influence induced by O₂·may not main mechanisms of seedling injury under acid rain and Pb²⁺ complication stress. It also perhaps that Pinus massoniana had higher resistance. In condition that, there are significant meaning for developing resistant forest of acid rain and Pb²⁺ complication polluted and reparate mountain soil polluted by Pb²⁺ used.