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Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation

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dc.contributor.author Cho, Moses A
dc.contributor.author van Aardt, J
dc.contributor.author Main, Russell S
dc.contributor.author Majeke, B
dc.date.accessioned 2010-09-10T07:32:04Z
dc.date.available 2010-09-10T07:32:04Z
dc.date.issued 2010-04
dc.identifier.citation Cho, M.A., van Aardt, J., Main, R. and Majeke, B. 2010. Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation. International Journal of Remote Sensing, Vol. 31(12), pp 3143-3159 en
dc.identifier.issn 0143-1161
dc.identifier.uri http://pdfserve.informaworld.com/910200_769431896_924588672.pdf
dc.identifier.uri http://hdl.handle.net/10204/4345
dc.description Copyright: 2010 Taylor & Francis. This is the author's Pre print version. The definitive version is published in the International Journal of Remote Sensing, Vol. 31(12), pp 3143-3159 en
dc.description.abstract Remote sensing is viewed as a cost-effective alternative to intensive field surveys in assessing site factors that affect growth of Eucalyptus grandis over broad areas. The objective of this study was to assess the utility of hyperspectral remote sensing to discriminate between site qualities in E. grandis plantation in KwaZulu-Natal, South Africa. The relationships between physiology-based hyperspectral indicators and site quality, as defined by total available water (TAW), were assessed for E. grandis plantations through one-way analysis of variance (ANOVA). Canopy reflectance spectra for 68 trees (25 good, 25 medium and 18 poor sites) were collected on clear-sky days using an Analytical Spectral Device (ASD) spectroradiometer (350-2500 nm) from a raised platform. Foliar macronutrient concentrations for N, P, K, S, Ca, Mg and Na and their corresponding spectral features were also evaluated. The spectral signals for leaf water-normalized difference water index (NDWI), water band index (WBI) and moisture stress index (MSI)-exhibited significant differences (p < 0.05) between sites. The magnitudes of these indices showed distinct gradients from the poor to the good sites. Similar results were observed for chlorophyll indices. These results show that differences in site quality based on TAW could be detected via imaging spectroscopy of canopy water or chlorophyll content. Among the macronutrients, only K and Ca exhibited significant differences between sites. However, a Tukey post-hoc test showed differences between the good and medium or medium and poor sites, a trend not consistent with the TAW gradient. The study also revealed the capability of continuum-removed spectral features to provide information on the physiological state of vegetation. The normalized band depth index (NBDI), derived from continuum-removed spectra in the region of the red-edge, showed the highest potential to differentiate between sites in this study. The study thus demonstrated the capability of hyperspectral remote sensing of vegetation canopies in identifying the site factors that affect growth of E. grandis in KwaZulu Natal, South Africa. en
dc.language.iso en en
dc.publisher Taylor & Francis en
dc.subject Remote sensing en
dc.subject Eucalyptus grandis en
dc.subject Soil water gradient en
dc.subject Hyperspectral remote sensing en
dc.subject Soil water en
dc.subject Plantations en
dc.title Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation en
dc.type Article en
dc.identifier.apacitation Cho, M. A., van Aardt, J., Main, R. S., & Majeke, B. (2010). Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation. http://hdl.handle.net/10204/4345 en_ZA
dc.identifier.chicagocitation Cho, Moses A, J van Aardt, Russel S Main, and B Majeke "Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation." (2010) http://hdl.handle.net/10204/4345 en_ZA
dc.identifier.vancouvercitation Cho MA, van Aardt J, Main RS, Majeke B. Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation. 2010; http://hdl.handle.net/10204/4345. en_ZA
dc.identifier.ris TY - Article AU - Cho, Moses A AU - van Aardt, J AU - Main, Russel S AU - Majeke, B AB - Remote sensing is viewed as a cost-effective alternative to intensive field surveys in assessing site factors that affect growth of Eucalyptus grandis over broad areas. The objective of this study was to assess the utility of hyperspectral remote sensing to discriminate between site qualities in E. grandis plantation in KwaZulu-Natal, South Africa. The relationships between physiology-based hyperspectral indicators and site quality, as defined by total available water (TAW), were assessed for E. grandis plantations through one-way analysis of variance (ANOVA). Canopy reflectance spectra for 68 trees (25 good, 25 medium and 18 poor sites) were collected on clear-sky days using an Analytical Spectral Device (ASD) spectroradiometer (350-2500 nm) from a raised platform. Foliar macronutrient concentrations for N, P, K, S, Ca, Mg and Na and their corresponding spectral features were also evaluated. The spectral signals for leaf water-normalized difference water index (NDWI), water band index (WBI) and moisture stress index (MSI)-exhibited significant differences (p < 0.05) between sites. The magnitudes of these indices showed distinct gradients from the poor to the good sites. Similar results were observed for chlorophyll indices. These results show that differences in site quality based on TAW could be detected via imaging spectroscopy of canopy water or chlorophyll content. Among the macronutrients, only K and Ca exhibited significant differences between sites. However, a Tukey post-hoc test showed differences between the good and medium or medium and poor sites, a trend not consistent with the TAW gradient. The study also revealed the capability of continuum-removed spectral features to provide information on the physiological state of vegetation. The normalized band depth index (NBDI), derived from continuum-removed spectra in the region of the red-edge, showed the highest potential to differentiate between sites in this study. The study thus demonstrated the capability of hyperspectral remote sensing of vegetation canopies in identifying the site factors that affect growth of E. grandis in KwaZulu Natal, South Africa. DA - 2010-04 DB - ResearchSpace DP - CSIR KW - Remote sensing KW - Eucalyptus grandis KW - Soil water gradient KW - Hyperspectral remote sensing KW - Soil water KW - Plantations LK - https://researchspace.csir.co.za PY - 2010 SM - 0143-1161 T1 - Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation TI - Evaluating variations of physiology-based hyperspectral features along a soil water gradient in Eucalyptus grandis plantation UR - http://hdl.handle.net/10204/4345 ER - en_ZA


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