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Field responses of Prunus serotina and Asclepias syriaca to ozone around southern Lake Michigan

Environmental Pollution

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Abstract

Higher ozone concentrations east of southern Lake Michigan compared to west of the lake were used to test hypotheses about injury and growth effects on two plant species. We measured approximately 1000 black cherry trees and over 3000 milkweed stems from 1999 to 2001 for this purpose. Black cherry branch elongation and milkweed growth and pod formation were significantly higher west of Lake Michigan while ozone injury was greater east of Lake Michigan. Using classification and regression tree (CART) analyses we determined that departures from normal precipitation, soil nitrogen and ozone exposure/peak hourly concentrations were the most important variables affecting cherry branch elongation, and milkweed stem height and pod formation. The effects of ozone were not consistently comparable with the effects of soil nutrients, weather, insect or disease injury, and depended on species. Ozone SUM06 exposures greater than 13 ppm-h decreased cherry branch elongation 18%; peak 1-h exposures greater than 93 ppb reduced milkweed stem height 13%; and peak 1-h concentrations greater than 98 ppb reduced pod formation 11% in milkweed. Decreased cherry branch elongation, milkweed stem height and pod production, and foliar injury on both species occurred at sites around southern Lake Michigan at ozone exposures of 13 SUM06 ppm-h and 93a??98 ppb peak hourly.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Field responses of Prunus serotina and Asclepias syriaca to ozone around southern Lake Michigan
Series title:
Environmental Pollution
Volume
142
Issue:
2
Year Published:
2006
Language:
English
Contributing office(s):
National Wildlife Health Center
Description:
p. 354-366
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Pollution
First page:
354
Last page:
366
Number of Pages:
13
Country:
United States
State:
Illinois, Indiana, Michigan, Wisconsin
Online Only (Y/N):
N
Additional Online Files(Y/N):
N