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Journal of Environmental Quality Abstract -

A Field Chamber for Testing Air Pollution Effects on Mature Trees


This article in JEQ

  1. Vol. 21 No. 3, p. 476-485
    Received: June 3, 1991

    * Corresponding author(s):
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  1. Timothy J. Albaugh *,
  2. Fred L. Mowry and
  3. Lance W. Kress
  1. Dep. of Forestry, North Carolina State Univ., Raleigh, NC 27695-8008;
    School of the Environ., Duke Univ., Durham, NC 27707;
    USDA-FS, Research Triangle Park, NC 27709.



A 3.6 m tall by 3 m diam. open-top chamber system built on 12-m towers for the dispensing and exclusion of air pollutants in the foliage of mature loblolly pine (Pinus taeda L.) trees was tested. Statistically significant position and height differences in O3 concentration inside the chamber were found for different wind speed categories. Calculation of a relative O3 concentration (ROC) showed remarkably similar relative O3 profiles for charcoal filtered (CF) and 2x ambient (2x) chambers. Large reductions in ROC are found above the 2.4-m level in both chambers. Ambient air intrusion was reduced in the modified chamber because it was protected by the canopy and contained a tree crown lessening air movement in the chamber. The mean temperature increase in the chamber from 1200 to 1259 h EST was 2.2°C, whereas the maximum temperature increase was 4.8°C. Statistically significant positional temperature differences were found within the chamber. The chamber system design was found useful in testing the effects of gaseous air pollutants on the crown of mature trees and is recommended for designed experiments.

This research was supported in part by the Southeastern Forest Exp. Stn., Southern Commercial Forest Res. Coop. of the Forest Response Program.
The Forest Response Program, part of the National Acid Precipitation Assessment Program, is jointly sponsored by the USDA-FS, USEPA, and the National Council of the Paper Industry for Air and Stream Improvement (NCASI). This paper has not been subject to USEPA or USDA-FS policy review and should not be construed to represent the policies of either Agency or of NCASI. The use of trade names in this paper does not imply endorsement by the associated agencies of the products named, nor criticism of similar ones not mentioned.

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