Analysis of the influence of the resistance for Taiwan´s native trees fumed by sulfur dioxide gas

Sulfur dioxide (SO₂) is one of the most toxic air pollutants for plants. The study chose five kinds of road trees which we have usually seen ever to research the influence for plants using sulfur dioxide gas. The trees are about 60~90 cm in height, which were taken the fuming test for 48 hours, the concentration of the sulfur dioxide gas are 600, 1000, 2000 ppb. The test is to evaluate the resistance of these trees by fuming sulfur dioxide gas, and to compare the parameters of the rate of photosynthesis and the index of the resistance for air pollutants from before and after the fuming test, then to analyze their physiological changes and the damages situation of the leaves from the trees after fuming. The results showed that the concentration of 2000 ppb sulfur dioxide is more serious than its 600 and 1000 ppb for plants in their damage situations. Besides of the rate of the net photosynthesis of Acacia confuse Merr. is 78% and indica (Burm.f.) Merr. 16% after fuming; Machilus kusanoi Hayata were dead. And the higher concentration of the fuming gas, the more evidence in the syndrome of the leaf´s surface.