Papers by Author: Pei Ling Chung

Abstract: The present study analyzed the tolerance of 10 common woody plants to gaseous nitrogen dioxide (NO₂). Experimental trees species were placed in fumigation chambers and exposed to different concentrations of NO₂ (600, 1000, and 2000 ppb) for 48 hours. Their physiological health was determined by measuring how chlorophyll fluorescence varied, identifying which tree species were more adaptive and resistant to NO₂. The results showed that NO₂-affected plants were harmed to some extent by reduced levels of chlorophyll fluorescence, which decreased more serous with higher concentrations of NO₂. Among the experimental tree species, the tolerance to NO₂ was ranked as Melia azedarach > Decussocarpus nagi > Palaquium formosanum > Pongamia pinnata > Messerschmidia argentea > Diospyros morrisiana > Lagerstroemia speciosa > Semecarpus gigantifolia > Aglaia formosana > Koelreuteria formosana.

Abstract: This study utilized a custom-made fumigation chamber to evaluate the chlorophyll fluorescence of 7 species sidewalk trees with 60 ppb O₃ for 10 days. The results showed that during the fumigation period, the plants showed a noticeable variation. At the first 6 days fumigation, the chlorophyll fluorescence of all tested trees showed a stable status with the values over 0.75. As of the 7^th days fumigation, the chlorophyll fluorescence of tested trees was lower than 0.75 except Cerbera manghas and Nageia nagi. After 9 days fumigation, the chlorophyll fluorescence values for all tested trees are significantly lower than before. Among all tested trees, the chlorophyll fluorescence of Palaquium formosanum had the most variant than before fumigation experiment, the next was Tournefortia argentea, than the Cerbera manghas, Terminalia catappa, Aglaia formosana, Millettia pinnata and Nageia nagi in series.

Abstract: The experiment tests carried out on the sulfur dioxide (SO2) will reduce the amount of carbon dioxide (CO2) into the plant body. When the plants absorb CO2, SO2 enters the stomata at the same time, and the photosynthesis rate will immediately fall. The carbon absorption potential showed decreased as SO2 concentration increasing. However, after 600 ppb SO2 gas fumigated for 48 hours, Hibiscus tiliaceus had the most carbon absorption potential reducing rate as 76% and the least influence by this concentration was Acacia confusa which reduced 2% carbon absorption potential. When the fumigation concentration rose to 1000 ppb, except the leaves of Camellia axillaries had all fallen, the Hibiscus tiliaceus also showed the most variance of carbon absorption potential as 81% reducing than before fumigation and the Hibiscus taiwanensis was the second with 65% reducing rate. As the fumigation concentration rose to 2000 ppb, the Camellia axillaries, Hibiscus taiwanensis, Viburnum odoratissimum and Hibiscus tiliaceus could not tolerate the high SO2 concentration environment and the leaves all fell away. The carbon absorption potential reduced more significant than two other fumigation concentration. The most variance was Palaquium formosanum which with 92% decrease. The Neolitsea parvigemma and Leea indica also had 85% and 84% reduce rate than before fumigation, respectively.

Abstract: Italic textThis research utilized a custom-made air fumigation equipment to evaluate the tolerance of 10 species of side-walk trees with 600, 1000 and 2000 ppb Sulfur Dioxide (SO₂) for 48 hours. The tolerance of tested trees toward SO₂ pollution was analyzed. Results showed that these plants influenced by high concentration SO₂ gas with physiology properties changes and the decrease of photosynthetic rates and the stomata conductance than before fumigation. The net photosynthetic rate and stomata conductance of tested trees was linearly correlated to each tested tree species. Among tested tree, the Quercus glauca had the highest tolerance in exposure with high concentration of SO₂ pollutant. While the Camellia axillaries was the least.