Unmanned aerial vehicle for the assessment of woody and herbaceous phytomass in Sahelian savanna ; Un dron para la evaluación de la fitomasa leñosa y herbácea de las sabanas sahelianas ; Un drone pour l’évaluation de la phytomasse ligneuse et herbacée des savanes sahéliennes
The phytomass of herbaceous and woody plants is the main source of feed for pastoral livestock in the Sahelian savanna. The assessment of the available feedstock plays a key role in national livestock policies and generally requires many field measurements of both herbaceous and woody plants. In this study, we tested the possibility of using a red-green-blue (RGB) unmanned aerial vehicle (UAV) to evaluate the phytomass of both woody and herbaceous species. We thus mapped 38 one hectare plots with a Dji Spark UAV in Northern Senegal. The herbaceous phytomass was measured on the ground. For the... Mehr ...
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Dokumenttyp: | Artikel |
Erscheinungsdatum: | 2021 |
Verlag/Hrsg.: |
Cirad
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Schlagwörter: | Above ground biomass / trees / grasses / grassland management / multispectral imagery / Sahel / Senegal / biomasse aérienne / arbre / graminée / imagerie multispectrale / conduite des herbages / Sénégal / biomasa sobre el suelo / árboles / gramineas / imágenes multiespectrales / manejo de praderas |
Sprache: | Englisch |
Permalink: | https://search.fid-benelux.de/Record/base-27668290 |
Datenquelle: | BASE; Originalkatalog |
Powered By: | BASE |
Link(s) : | https://revues.cirad.fr/index.php/REMVT/article/view/36802 |
The phytomass of herbaceous and woody plants is the main source of feed for pastoral livestock in the Sahelian savanna. The assessment of the available feedstock plays a key role in national livestock policies and generally requires many field measurements of both herbaceous and woody plants. In this study, we tested the possibility of using a red-green-blue (RGB) unmanned aerial vehicle (UAV) to evaluate the phytomass of both woody and herbaceous species. We thus mapped 38 one hectare plots with a Dji Spark UAV in Northern Senegal. The herbaceous phytomass was measured on the ground. For the woody communities, we evaluated the leaf phytomass using dendrometric parameters combined with allometric equations. We performed partial-least square regressions between UAV-based three-dimension and color indices and phytomass. Results showed a Q² (cross validation results for each response variable) of 0.57 for woody phytomass, 0.68 for herbaceous dry mass, and 0.76 for their fresh mass. This study confirmed the relevance of using low-cost RGB UAV to assess savanna phytomass. ; La fitomasa de las plantas herbáceas y leñosas es la principal fuente de alimentación del ganado de pastoreo en las sabanas sahelianas. La evaluación de la materia prima disponible juega un rol clave en las políticas nacionales de cría y requiere generalmente numerosas tomas de medidas de terreno de las plantas herbáceas y leñosas. En este estudio, hemos examinado la posibilidad de utilizar un dron de bandas espectrales rojoverde- azul (RGB) para evaluar la fitomasa de las especies leñosas y herbáceas. Con un dron Dji Spark hemos así cartografiado 38 parcelas de una hectárea en el norte de Senegal. La fitomasa herbácea fue medida en el suelo. Para las comunidades leñosas, hemos evaluado la fitomasa foliar utilizando parámetros dendrométricos asociados a ecuaciones alométricas. Hemos efectuado regresiones de mínimos cuadrados parciales entre los índices (en tres dimensiones y a color) obtenidos mediante dron y la fitomasa. Los resultados mostraron ...