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    Author(s): W. T. Lawhon; F. W. Woods
    Date: 1976
    Source: In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 1025-1026
    Publication Series: General Technical Report (GTR)
    Station: Northeastern Research Station
    PDF: View PDF  (106.73 KB)

    Description

    The objectives of this study were twofold: (1) to develop a gamma densitometry technique for measuring the relative wood density and radial growth of trees from 12 mm increment cores; and (2) to determine whether changes in the relative wood density and radial growth of "resistant" eastern white pine (Pinus strobus L.) occurred after initiation of operations of the Kingston and Bull Run steam plants in eastern Tennessee. The study area was surveyed by air to determine the distribution of white pine around the Kingston and Bull Run steam plants. It was found that white pine was distributed into roughly three "groups" (11 sampling locations): Group 1, located west of Bull Run Steam Plant; Group 2, located northeast of the Kingston Steam Plant; and Group 3, located southwest of the Kingston Steam Plant. These groups served as the basis for subsequent analyses. Two 12 mm increment cores were taken from each of 89 dominant or codominant eastern white pine for analysis using the gamma densitometry technique. Within each core, two five-year periods were analyzed for: (1) relative wood density, (2) radial growth, (3) percent earlywood, and (4) percent latewood. One five-year period was designated as the "pre-impact" (before steam plant operations) period and the other was designated as the "post-impact" period (after steam plant operations). The annual ring for the year of steam plant start up was not included in this study. Four questions were asked: (1) was there a difference in the pre- and post-impact relative wood density and radial growth of eastern white pine in the vicinity of the Kingston and Bull Run steam plants, (2) were there any difference in the pre- and post-impact relative wood density and radial growth among groups, (3) if so, did distance and azimuth from each location to the nearest steam plant influence the difference between the pre- and post-impact relative wood density and radial wood growth at each location, and (4) could differences between pre- and post-impact relative wood density and radial growth at each location be described by age or certain environmental variables.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Lawhon, W. T.; Woods, F. W. 1976. Radial growth and wood density of white pine in relation to fossil-fired power plant operations. In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 1025-1026

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