Preliminary Exploration On The Resistance And Mechanism To Sulfur Dioxide Of P.chinensis Bunge

P.chinensis Bunge attributes Anacardiaceae to Pistacia Linn. It’s a kind of important woody oil resources with high economic and ornamental value. It resists harmful gas such as the sulfur dioxide. Through simulating the sulfur dioxide pollution, supplying high-sulfur to P.chinensis Bunge seedling and treelet, different pH treatment to seedling, this research mainly studied the effect of sulfur dioxide pollution condition on physiological and biochemical indexes changes of P.chinensis Bunge, the effect of high-sulfur supply on growth and physiological and biochemical indexes of P.chinensis Bunge seedling and treelet, the ability of absorption, accumulation, enrichment to sulfur, besides these, the effect of different pH on growth of P.chinensis Bunge seedling were also researched. So as to preliminary explore the resistance and mechanism to sulfur dioxide of P.chinensis Bunge. The results were as follows.1. Low concentration mixed liquid of Na2SO3 and NaHSO3 had little effect on leaf morphological.Mixed liquid of Na2SO3 and NaHSO3 which concentration more than 200mmol.L-1 had acute injury to P.chinensis Bunge. The tolerance threshold concentration which could be tolerance to the plant was 200mmol.L-1. P.chinensis Bunge had strong resistance to the sulfur dioxide pollution.2. Under the treatment of mixed liquid of Na2SO3 and NaHSO3, SOD activity first decreases and then increased substantially. POD activity first increased and then decreases gradually. SOD and POD activity reach the maximum by the treatment of mixed liquid of Na2SO3 and NaHSO3 which concentration was 200mmol.L-1. Under the treatment of mixed liquid of Na2SO3 and NaHSO3, membrane permeability increased with the increase of treatment density and stress time.Membrane permeability reached the maximum by the treatment of mixed liquid of Na2SO3 and NaHSO3 which concentration was 500mmol.L-1.3. Under low concentration mixed liquid of Na2SO3 and NaHSO3, Chlorophyll content of P.chinensis Bunge increased and increase rate reached the maximum by the treatment of mixed liquid of Na2SO3 and NaHSO3 which concentration was 50mmol.L-1. Chlorophyll content reduced significantly under high concentration mixed liquid of Na2SO3 and NaHSO3. Under the treatment of mixed liquid of Na2SO3 and NaHSO3. Pn and Cond reduced and reached the lowest by the treatment of mixed liquid of Na2SO3 and NaHS03 which concentration was 500mmol.L-1. Ci increased under the treatment of mixed liquid of Na2SO3 and NaHSO3.4. Under the treatment of mixed liquid of Na2SO3 and NaHSO3, the content of sulfur in leaf of P.chinensis Bunge increased with the concentration of mixed liquid of Na2SO3 and NaHSO3 and have a positive correlation. The content of sulfur reached the maximum by the treatment of mixed liquid of Na2SO3 and NaHSO3 which concentration was 500mmol.L-1.Compared with Distylium racemosum and Viburnum awabuki, the sulfur absorbing capacity of P.chinensis Bunge greater than Distylium racemosum and less than Viburnum awabuki.5. Along with the increase of sulfur stress level, the height of P.chinensis Bunge seedling increased gradually, the fresh weight of the seedlings aboveground parts was significant downward. In the extremely sulfur stress (2.8g/pot) the fresh weight of plant aboveground dropped to a minimum. Fresh weight of the roots had a significant increase with the lower sulfur stress. Fresh weight of the roots increased to a maximum with the light sulfur stress(0.35g/pot). Root fresh weight was reduced significantly under a high concentration of sulfur stress (1.4g/pot and 2.8g/pot). Root fresh weight dropped to a minimum under the extremely sulfur stress (2.8g/pot)6. Along with the increase of sulfur stress level, chlorophyll a, chlorophyll b, chlorophyll, the total of all was to reduce tendency. The content of chlorophyll reached the maximum under the extremely sulfur stress(2.8g/pot); Root activity of P.chinensis Bunge seedling was inhibited under high concentrations of sulfur stress, root activity reduced markedly.7. Along with the increase of sulfur stress level, the content of sulfur in the P.chinensis Bunge seedling increased and reached the max maximum under a moderate concentration of sulfur stress (0.7g/pot), the root could be hurt, the absorption of nutrients such as sulfur was affected.8. Sulphur treatment had little effect on the content of chlorophyll of P.chinensis Bunge, soluble protein content reduced dramatically. The protein synthesis was inhibited or decomposition under high sulphur supply to P.chinensis Bunge.9. Along with the increase of sulpfur stress level, the content of sulfur in the root, stalk, leaf of P.chinensis Bunge, the total of all was to increase. The content of sulfur reached the maximum by the treatment of sulpfur stress which concentration was 1500mg/kg. Under the treatment of sulpfur stress, the BCF and TF decreased dramatically, the ability of absorption, accumulation, enrichment to sulfur possible were not the major factor of P.chinensis Bunge which had strong resistance to sulfur dioxide pollution. 10. Under the treatment of different pH, the plant height of P.chinensis Bunge seedling was decreased to compare with contrast. The treatment had little effect to P.chinensis Bunge seedling besides in environment of exceeding acidity or alkalinity. The plant height, root length, fresh weight of the roots, fresh weight of plant aboveground reached maximum when the pH is 6.5.The suitability of P.chinensis Bunge to pH treatment was great. P.chinensis Bunge could grow normally in pH value which in between 5.5 to 9.5 and grow best in pH value which in between 6 to 7.The pH value of soil had much effect on growth of P.chinensis Bunge seedling. Root activity of P.chinensis Bunge seedling reduced obviously under soil of exceeding acidity or alkalinity, moreover, growth of P.chinensis Bunge seedling was inhibited.