Estimating mineral content of indigenous browse species using laboratory spectroscopy and sentinel-2 imagery |
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| Affiliation: | 1. Institute of Geography and Geoecology, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany;2. Biology Department, KU Leuven, Kasteelpark Arenberg 31-2435, 3001 Leuven, Belgium;3. UR “Ecologie et Dynamique des Systèmes Anthropisés” (EDYSAN, UMR 7058 CNRS), Université de Picardie Jules Verne, 1 rue des Louvels, 80037 Amiens Cedex 1, France;4. Département Recherche et Développement, Office National des Forêts, Boulevard de Constance, 77300 Fontainebleau, France;5. Institute of Geography, FAU Erlangen-Nuremberg, Wetterkreuz 15, 91058 Erlangen, Germany;6. Ecology and Vegetation Physiology Group (EcoFiv), Universidad de los Andes, Cr. 1E No 18A, Bogotá, Colombia;7. VITO Flemish Institute for Technological Research, Boeretang 200, 2400 Mol, Belgium;8. Department of Earth & Environmental Sciences, KU Leuven, Celestijnenlaan 200E, 3001 Leuven, Belgium;9. Institut Français de Recherche pour l''Exploitation de la Mer, UMR MARBEC, Avenue Jean Monnet CS, Sète, France;10. Department of Biodiversity and Molecular Ecology, Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 San Michele all''Adige, TN, Italy;11. Center Agriculture Food Environment, University of Trento, Via E. Mach 1, 38010 San Michele all''Adige, TN, Italy;12. Centre for Integrative Biology, University of Trento, Via Sommarive, 14, 38123 Povo, TN, Italy;1. Division of Forest, Nature and Landscape, KU Leuven, Celestijnenlaan 200E, 3001 Leuven, Belgium;2. Faculty of Psychology and Educational Sciences and Imec-Itec, KU Leuven, Etienne Sabbelaan 51, 8500 Kortrijk, Belgium;3. Division of Ecology, Evolution and Biodiversity Conservation, KU Leuven, Kasteelpark Arenberg 31, 3001 Leuven, Belgium |
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| Abstract: | Trees provide low-cost organic inputs, with the potential to improve livelihoods for rural communities. Understanding foliar nutrients of tree species is crucial for integration of trees into agroecosystems. The study explored nitrogen (N), phosphorus (P), potassium (K) and calcium (Ca) concentrations of nine browse species collected from the bushveld region of South Africa using wet analysis and laboratory spectroscopy in the region 400–2500 nm, along with partial least squares (PLS) regression. We further explore the relationship between canopy reflectance of Sentinel-2 image and foliar N, P, K & Ca. Laboratory spectroscopy was significant for N estimation, while satellite imagery also revealed useful information about the estimation of nitrogen at landscape level. Nitrogen was highly correlated with spectral reflectance (R2 = 0.72, p < 0.05) for winter and (R2 = 0.88, p < 0.05) for summer, whilst prediction of phosphorus potassium and calcium were considered not accurate enough to be of practical use. Modelling the relationship using Sentinel-2 data showed lower correlations for nitrogen (R2 = 0.44, p < 0.05) and the other nutrients when compared to the dried samples. The findings indicate that there is potential to assess and monitor resource quality of indigenous trees using nitrogen as key indicator. This multi-level remote sensing approach has promise for providing rapid plant nutrient analyses at different scales. |
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| Keywords: | Laboratory spectroscopy Hyperspectral data Multispectral data Wet analysis Nitrogen Sentinel-2 Continuum removal Partial least squares regression |
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