Phases or regimes? Revisiting NDVI trends as proxies for land degradation
One of the main challenges in land degradation assessment is that a rigorous and systematic approach to addressing its complex dynamics is still missing. The development and application of operative tools at regional and global scales remain a challenge. Land degradation is usually defined as a long...
| Autores principales: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
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Wiley
2019
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| Acceso en línea: | http://hdl.handle.net/20.500.12123/4248 https://onlinelibrary.wiley.com/doi/abs/10.1002/ldr.2871 https://doi.org/10.1002/ldr.2871 |
| _version_ | 1855483395606315008 |
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| author | Easdale, Marcos Horacio Bruzzone, Octavio Augusto Mapfumo, Paul Tittonell, Pablo Adrian |
| author_browse | Bruzzone, Octavio Augusto Easdale, Marcos Horacio Mapfumo, Paul Tittonell, Pablo Adrian |
| author_facet | Easdale, Marcos Horacio Bruzzone, Octavio Augusto Mapfumo, Paul Tittonell, Pablo Adrian |
| author_sort | Easdale, Marcos Horacio |
| collection | INTA Digital |
| description | One of the main challenges in land degradation assessment is that a rigorous and systematic approach to addressing its complex dynamics is still missing. The development and application of operative tools at regional and global scales remain a challenge. Land degradation is usually defined as a long‐term decline in ecosystem function and productivity. Due to its temporal and spatial resolution as well as data availability, the use of time series of spectral vegetation indexes obtained from satellite sensors has become frequent in recent studies in this field. Slope of linear trends of the normalized difference vegetation index is usually considered an accurate indicator and is widely used as a proxy for land degradation. Yet this method is built on a number of simplifying conceptual and methodological assumptions that prevent capturing more complex dynamics, such as cyclic or periodic behaviors. Our aim was to examine the limitations associated with using linear normalized difference vegetation index trends as proxies for land degradation by comparing outcomes with an alternative methodological procedure based on wavelet autoregressive methods. We explored these issues in 5 case studies from Africa and South America. We observed that trend explained a marginal portion of total temporal variability, whereas monotonic functions, such as linear trends, were unable to capture dynamics that were non‐unidirectional, resulting in misinterpretation of actual trends. Wavelet autoregressive method results were encouraging as a step towards the application of more accurate methods to provide sound scientific information of land degradation and restoration. |
| format | Artículo |
| id | INTA4248 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | INTA42482019-01-10T18:13:55Z Phases or regimes? Revisiting NDVI trends as proxies for land degradation Easdale, Marcos Horacio Bruzzone, Octavio Augusto Mapfumo, Paul Tittonell, Pablo Adrian Degradación de Tierras Desertificación Land Degradation Desertification Satellite Imagery Reclamation Imágenes por Satélites Rehabilitación de Tierras MODIS One of the main challenges in land degradation assessment is that a rigorous and systematic approach to addressing its complex dynamics is still missing. The development and application of operative tools at regional and global scales remain a challenge. Land degradation is usually defined as a long‐term decline in ecosystem function and productivity. Due to its temporal and spatial resolution as well as data availability, the use of time series of spectral vegetation indexes obtained from satellite sensors has become frequent in recent studies in this field. Slope of linear trends of the normalized difference vegetation index is usually considered an accurate indicator and is widely used as a proxy for land degradation. Yet this method is built on a number of simplifying conceptual and methodological assumptions that prevent capturing more complex dynamics, such as cyclic or periodic behaviors. Our aim was to examine the limitations associated with using linear normalized difference vegetation index trends as proxies for land degradation by comparing outcomes with an alternative methodological procedure based on wavelet autoregressive methods. We explored these issues in 5 case studies from Africa and South America. We observed that trend explained a marginal portion of total temporal variability, whereas monotonic functions, such as linear trends, were unable to capture dynamics that were non‐unidirectional, resulting in misinterpretation of actual trends. Wavelet autoregressive method results were encouraging as a step towards the application of more accurate methods to provide sound scientific information of land degradation and restoration. Estación Experimental Agropecuaria Bariloche Fil: Easdale, Marcos Horacio. Instituto Nacional de Tecnología Agropecuaria (INTA). Estacion Experimental Agropecuaria Bariloche. Área Desarrollo Rural. Grupo de Sistemas de Producción y Territorios; Argentina Fil: Bruzzone, Octavio Augusto. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina Fil: Mapfumo, Paul. University of Zimbabwe. Department of Soil Science and Agricultural Engineering, Zimbawe Fil: Tittonell, Pablo Adrian. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina 2019-01-10T18:05:06Z 2019-01-10T18:05:06Z 2018-03 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/4248 https://onlinelibrary.wiley.com/doi/abs/10.1002/ldr.2871 1085-3278 https://doi.org/10.1002/ldr.2871 eng info:eu-repo/semantics/restrictedAccess application/pdf Wiley Land Degradation & Developmen 29 (3) : 433–445 (Marzo 2018) |
| spellingShingle | Degradación de Tierras Desertificación Land Degradation Desertification Satellite Imagery Reclamation Imágenes por Satélites Rehabilitación de Tierras MODIS Easdale, Marcos Horacio Bruzzone, Octavio Augusto Mapfumo, Paul Tittonell, Pablo Adrian Phases or regimes? Revisiting NDVI trends as proxies for land degradation |
| title | Phases or regimes? Revisiting NDVI trends as proxies for land degradation |
| title_full | Phases or regimes? Revisiting NDVI trends as proxies for land degradation |
| title_fullStr | Phases or regimes? Revisiting NDVI trends as proxies for land degradation |
| title_full_unstemmed | Phases or regimes? Revisiting NDVI trends as proxies for land degradation |
| title_short | Phases or regimes? Revisiting NDVI trends as proxies for land degradation |
| title_sort | phases or regimes revisiting ndvi trends as proxies for land degradation |
| topic | Degradación de Tierras Desertificación Land Degradation Desertification Satellite Imagery Reclamation Imágenes por Satélites Rehabilitación de Tierras MODIS |
| url | http://hdl.handle.net/20.500.12123/4248 https://onlinelibrary.wiley.com/doi/abs/10.1002/ldr.2871 https://doi.org/10.1002/ldr.2871 |
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