Detection of 2,4-D herbicide damage using ground-based measurements : implications for remote sensing Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/h989r569z

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  • Spectral patterns of three brush species under the influence of herbicide treatment were investigated to evaluate the effectiveness of monitoring forest vegetation management using ground-based and remote sensing techniques. Foliage of Pacific rhododendron (Rhododendron macrophyllum D. Don), golden chinkapin (Castanopsis chrysophylla Dougl.), and hairy manzanita (Arctostaphylos columbiana Piper) sprayed with 2,4-D herbicide had midday reflectance measurements within 4 months of treatment that were 10 to 30 percent lower than adjacent plants with no signs of damage. The differences in reflectance were most pronounced in the near-infrared versus the visible portion of the electromagnetic spectrum and varied by species. Differences persisted under varying direct solar intensity, displayed only a weak association with seasonal plant moisture stress or canopy cover, and could be used to detect 2,4-D herbicide damage. Existing remote sensing techniques may provide a means of collecting such data in a scientific and cost-effective manner, enabling the researcher to better understand the inherent and manipulated growth characteristics of forest vegetation subjected to management.
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