Study on Resistance of Aluminum-stressed Masson Pines to High/Low Temperature, Aridity and Sulfur Dioxide
铝处理马尾松对高温、低温、干旱和SO2的抗性研究

Having grown in the aluminum solution of different concentrations (0,15,30,60,120,240ppm) for two months, the saplings of masson pines were, migrated respectively to the places where the temperature was high or low, or whert was dry or in a chamber filled with a certain concentration of SO2. It was found that the membrane per-meability of the Al-stressed saplings was, significantly higher than ordinary ones, and the resistance of Al-stressed masson pines to high/low temperatures, aridity and SO2 fell into a decline. After exposing in 300ppb SO2, the Al-stressed masson pines showed visible injury symptoms, such as leaf yellowing, necroses on leaf tips and margins. However, on the ordinary masson pines, it appeared not. Under the conditions of high/low temperatures or aridity, the leaves of Al-stressed masson pines appeared to be withering.