Severity and Frequency of SO2-Induced Leaf Necrosis on Seedlings of 57 Tree Species
Container-grown seedlings or rooted cuttings of 57 tree species common in the northeastern United States were tested during 1977-80 to establish the severity and frequency of SO2-induced leaf necrosis for each species. Plants were exposed to 0.9 ppm SO2 (2,400 g m-3) for 2 or 4 hr in controlled-environment chambers. Species were grouped into four sensitivity classes. For seven species considered highly sensitive, more than 40 percent of the individuals exhibited symptoms, and more than 4 percent of the leaf surface on a typical individual was necrotic on average. At the other extreme, eight species did not develop symptoms. The results are consistent with a direct relationship between a species's tolerance to SO2 and its shade tolerance. Forest Sci. 30:587-596.
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Document Type: Journal Article
Affiliations: Professor, Program in Ecology, Department of Plant Pathology, and Center for Air Environment Studies, The Pennsylvania State University, University Park, PA 16802
Publication date: 1984-09-01
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