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Show simple item record Van Deventer, Heidi Cho, Moses A 2014-08-27T12:39:51Z 2014-08-27T12:39:51Z 2014-07
dc.identifier.citation Van Deventer, H. and Cho, M.A. 2014. Assessing leaf spectral properties of Phragmites australis impacted by acid mine drainage. Assessing leaf spectral properties of Phragmites australis impacted by acid mine drainage, vol. 110(7/8), pp 1-12 en_US
dc.identifier.issn 0038-2353
dc.description Copyright: 2014 AOSIS Open Journals. Published in South African Journal of Science, vol. 110(7/8), pp 1-12 en_US
dc.description.abstract The decanting of acid mine drainage (AMD) from the Western Basin on the Witwatersrand in late 2010 raised concerns about AMD risks in other gold, coal and copper mining areas of South Africa. Field spectroscopy and the use of vegetation indices could offer an affordable and easy means of monitoring the impact of mine water and/or AMD on vegetation. The impact of raw and treated mine water or contaminated soil on wetland vegetation often manifests in growth inhibition and reduction of foliar pigments and nutrient levels. Surveying the impact on wetland vegetation or underlying soils can be difficult and expensive considering the cost of laboratory analysis of samples. The potential of field spectroscopy for detecting the impact of mine water on wetland vegetation was examined by assessing (1) whether there was a significant difference in leaf spectra between sites receiving mine water and a non-impacted control site and (2) whether there was a gradation of vegetation condition downstream from the decanting site. Two vegetation indices were derived from portable field spectrometer-measured spectra of five green leaves of Phragmites australis – the chlorophyll red edge position (REP) and the normalised difference vegetation index (NDVI) – for two dormant (winter) and peak growth (summer) seasons in 2011–2012. Mean REP and NDVI values were significantly (p<0.05) lower for affected sites compared to the control site for both seasons and years. The range of REP values for young green leaves in winter for affected sites was 695–720 nm compared to the narrower range of 705–721 nm for the control site. The mean REP values for young green leaves in winter was 708 nm for the affected sites compared to 716 nm for the control site. The downstream gradation, however, fluctuated for REP and NDVI over the study period. We conclude that field spectroscopy shows potential to serve as a relatively quick and affordable means to assess the condition and health of vegetation affected by AMD. en_US
dc.language.iso en en_US
dc.publisher AOSIS Open Journals en_US
dc.relation.ispartofseries Workflow;13311
dc.subject Acid mine drainage en_US
dc.subject AMD en_US
dc.subject Contaminated soil en_US
dc.subject Wetland vegetation en_US
dc.subject Leaf spectra en_US
dc.subject Chlorophyll red edge position en_US
dc.subject Field spectroscopy en_US
dc.subject Normalised difference vegetation index en_US
dc.subject NDVI en_US
dc.subject Phragmites australis en_US
dc.title Assessing leaf spectral properties of Phragmites australis impacted by acid mine drainage en_US
dc.type Article en_US

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