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Lookup NU author(s): Dr Meredith Williams, Professor Stuart Barr
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Field spectroscopy of spring and winter barley were acquired for two field campaigns in 2005 and 2006 at selected transects perpendicular to a stretch of buried gas pipeline in Aberdeenshire, UK. A spatially intensive field spectroscopy experimental design for acquiring spectra under challeng-ing heterogeneous field conditions is developed and implemented. The rigour and success of the experimental design to detect above pipeline vegetation stress associated with pipeline earthworks is determined by first derivative analysis to inform waveband selection for vegetation stress ratios. Two ratios were employed, the (i) 725:702 nm ratio and a modified version of this ratio (723:700 nm). Results suggest that the experimental design successfully encapsulates the full spatial extent and spectral characteristics of pipeline earthworks associated with vegetation stress. Evidence for this assertion is the ability of the 723:700 and 725:702 nm ratios to detect stress above the 20” NGL pipeline. Ratio values being of the same order of magnitude as the 2005 data and similar to those conducted under controlled conditions by (i), with differences of up to 56 % for spring barley. The 723:700 and 725:702 nm ratios provided consistent results between different test sites and field seasons intimating their transferability to heterogeneous field conditions. Regression analysis broadly explain the association between organic carbon and the 723:700 and 725:702 nm ratios with R2 values of 0.59 and 0.61. T-tests were statistically significant at the 0.10 confidence level for ratio values between stress and control transects for disturbed soil.
Author(s): White DC, Williams M, Barr SL
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 5th EARSeL Workshop on Imaging Spectroscopy
Year of Conference: 2007
Pages: CD-ROM
URL: http://5thearselsigis.vgt.vito.be/CD/index.html
