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    Author(s): Walter C. Shortle; Peter S. Murdoch; Kevin T. SmithRakesh Minocha; Gregory B. Lawrence
    Date: 2008
    Source: In: Murdoch, Peter S.; Jenkins, Jennifer C.; Birdsey, Richard A. The Delaware River Basin Collaborative Environmental Monitoring and Research Initiative. Gen. Tech. Rep. NRS-25. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 52-62.
    Publication Series: Other
    Station: Northern Research Station
    PDF: View PDF  (571.0 KB)

    Description

    Atmospheric emissions from industrial processes in the early part of the 20th century resulted in acidic deposition in the Northeastern U.S., a phenomenon known as "acid rain." Acid rain has been implicated in acidification of sensitive waterways, nitrate enrichment of surface waters, and fish population declines in poorly buffered mountain streams (Baldigo and Lawrence 2000, Murdoch et al. 1998). Scientists are also discovering that acid rain has had additional lasting and negative effects on soil and stream chemistry and that these chemical changes may slow tree growth (Hallett et al. 2006). The goals of this research and monitoring development project were to: develop relationships between soil and foliar calcium (Ca), soil and stream Ca, forest nitrogen (N) saturation, and tree productivity at intensive monitoring and research areas (IMRAs) to quantify and verify the impact of Ca depletion on forest growth; develop methods for regional monitoring of forest and stream recovery from acidification, Ca depletion, and other stressors; and develop methods for early detection of forest and ecosystem stress due to factors such as Ca depletion.

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    Citation

    Shortle, Walter C.; Murdoch, Peter S.; Smith, Kevin T.; Minocha, Rakesh; Lawrence, Gregory B. 2008. 6.0 Monitoring recovery from calcium depletion and nitrogen saturation. In: Murdoch, Peter S.; Jenkins, Jennifer C.; Birdsey, Richard A. The Delaware River Basin Collaborative Environmental Monitoring and Research Initiative. Gen. Tech. Rep. NRS-25. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 52-62.

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