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    Author(s): John L. Campbell; Robert E. KennedyWarren B. Cohen; Richard F. Miller
    Date: 2012
    Source: Rangeland Ecology and Management. 65(3): 223-231
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (906.59 KB)

    Description

    Our ability to assess the continental impacts of woody encroachment remains compromised by the paucity of studies quantifying regional encroachment rates. This knowledge gap is especially apparent when it comes to quantifying the impact of woody encroachment on large-scale carbon dynamics. In this study, we use a combination of aerial photography from 1985-1986 and 2005 and near-annual Landsat satellite imagery over the same period to assess the rates of encroachment by western juniper, Juniperus occidentalis Hook., into the grasslands and shrublands of eastern Oregon. The approximately 20-yr Landsat reflectance trajectories identified for the juniper woodlands of eastern Oregon did not correlate well with changes in juniper crown cover over the same period, suggesting that systematic trends in reflectance are being driven by vegetation other than juniper.

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    Citation

    Campbell, John L.; Kennedy, Robert E.; Cohen, Warren B.; Miller, Richard F. 2012. Assessing the carbon consequences of western juniper (Juniperus occidentalis) encroachment across Oregon, USA. Rangeland Ecology and Management. 65(3): 223-231.

    Keywords

    biomass, crown cover, Landsat, reflectance, remote sensing

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https://www.fs.usda.gov/treesearch/pubs/42475