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Hyperspectral Remote Sensing to Detect Biotic and Abiotic Stress in Water Hyacinth,
Expanded Title:The study investigated the physiological status of water hyacinth grown with eight different heavy metals in a single-metal tub trial, three different simulated acid mine drainage (AMD) treatments in a pool trial under the influence of biocontrol agent from Neochetina spp., and in the Vaal River at the inlets of its tributaries, namely the Koekmoerspruit and the Schoonspruit. A hand-held spectrometer, the analytic spectral device (ASD), was used to measure reflectance. The hypothesis was tested that hyperspectral RS can “see” the response of the plant to both the heavy metals and the biocontrol-induced stresses and their interactions. The feasibility of using the hyperspectral remote sensing (HRS) to identify both metal/AMD and weevil-induced plant stresses and accurately evaluate water hyacinth was confirmed by the consistent effects of the three metals (Cu, Hg and Zn) in the single-metal tub trial, and the medium and high AMD concentration treatments in the simulated AMD pool trial, as well as the increased pollution level after the rain, particularly on the Schoonspruit site, on the weevil’s activities and plant growth parameters with those found in RS data. The results indicate that HRS has potential as a tool to assess the physiological status of water hyacinth from a remote position, and to therefore inform management intervention in control of the weed. Its application at a larger scale requires further studies. Although the general activities of the weevils decreased in response to metal pollution and AMD, the weevils nevertheless managed to cause some damage to the plants. The use of weevils as biocontrol agents will, however, be hindered by the pollutants and should be used synergistically with herbicides.
Date Published:01/01/2013
Document Type:Research Report
Document Subjects:Ecosystem - Biodiversity protection, Ecosystem - Climate Change, Ecosystem - Biomonitoring, Ecosystem - Resource Economics
Document Keywords:Climate, Environment, Health, Surface Water, Water Quality
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:2037/1/13
ISBN No:9781770059757
Authors:Solomon W; Newete; Barend F N; Erasmus; Marcus J; Byrne
Project No:K5/2037
Organizations:University of the Witwatersrand School of Animal, Plant and Enviromental Sciences
Document Size:3 192 KB
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