The impact of recent gully filling practices on wheat yield at the Campiña landscape in Southern Spain
The significance of gully filling practices on agricultural production has been only rarely evaluated in literature. In this study, a medium-sized catchment was selected, for being representative of the conventional farming practices on annual crops in the Campiña landscape in Southern Spain. Durin...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
August 2021
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| In: |
Soil & tillage research
Year: 2021, Jahrgang: 212, Pages: 1-13 |
| ISSN: | 0167-1987 |
| DOI: | 10.1016/j.still.2021.105041 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.still.2021.105041 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0167198721001112 
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| Verfasserangaben: | Carlos Castillo, Rafael Pérez, Miguel Vallejo-Orti |
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| 520 | |a The significance of gully filling practices on agricultural production has been only rarely evaluated in literature. In this study, a medium-sized catchment was selected, for being representative of the conventional farming practices on annual crops in the Campiña landscape in Southern Spain. During two wheat campaigns, an analysis of the spatial and temporal evolution of satellite-based vegetation indexes (NDVI, EVI and VH/VV radar polarization ratio) was conducted before and after gully filling practices associated to a rehabilitation project. The development of a linear model of topographic factors along with the calibration of a yield equation using a field survey allowed to determine the expected site-based productivities in the study area. The maximum EVI proved to be the best proxy for wheat yield in a location and was controlled mainly by rainfall and irradiation conditions. A significant yield reduction was found in the vicinity of those gullies affected by soil scraping within the rehabilitation project. Indirect yield losses in the productive land doubled the direct cost of unproductive areas caused by gullying and, when added up to the latter, between 15-25% of the expected yield was found to be lost. Although longer and broader studies are needed to confirm our results, this case study shows that current agricultural practices are not environmentally unsustainable but also economically detrimental. Moreover, it highlights that the impact assessment of gully erosion cannot only be circumscribed to the eroded area but the degradation of gully-adjacent locations must be also considered. | ||
| 650 | 4 | |a Erosion costs | |
| 650 | 4 | |a Filling | |
| 650 | 4 | |a Gully erosion | |
| 650 | 4 | |a NDVI | |
| 650 | 4 | |a Vegetation index | |
| 650 | 4 | |a Yield loss | |
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