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https://hdl.handle.net/11000/32254
Do we really need large spectral libraries for local scale SOC assessment with NIR spectroscopy?
Título : Do we really need large spectral libraries for local scale SOC assessment with NIR spectroscopy? |
Autor : Guerrero, César Wetterlind, Johanna Stenberg, Bo Mouazen, Abdul Gabarrón-Galeote, Miguel Ángel Ruiz Sinoga, José Damián Zornoza, Raul VISCARRA ROSSEL, Raphael |
Editor : Elsevier |
Departamento: Departamentos de la UMH::Agroquímica y Medio Ambiente |
Fecha de publicación: 2016-01 |
URI : https://hdl.handle.net/11000/32254 |
Resumen :
Near infrared (NIR) spectroscopy was used to predict the soil organic carbon (SOC) contents at local scale in eleven target sites. For that, eight spectral libraries of different sizes (ranging from 3482 to 36 samples) were used to construct national, provincial and local scale models. Inaccurate predictions were obtained except when the largest national library was used to construct the model. We also obtained SOC predictions once the models were adapted to target sites characteristics. For the models’ adaptation, we used a two-step approach consisting on spiking (as first step) and extra-weighting (as second step). The effect of spiking was small in larger-sized models and high in smaller-sized models, whereas the effect of extra-weighting was small in smaller-sized models and large in larger-sized models. The very high accuracy obtained after models’ adaptation (R2 > 0.95; RPIQ > 5.48), regardless of the size of the spectral library, suggests that large spectral libraries are not needed for local scale SOC assessment. These results have important implications regarding the way that NIR spectroscopy can result highly effective for land management and how users can focus and organize the analytical efforts.
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Palabras clave/Materias: Near infrared spectroscopy Soil organic carbon Spiking Extra-weighting Local-scale Diffuse reflectance spectroscopy |
Área de conocimiento : CDU: Ciencias puras y naturales |
Tipo documento : application/pdf |
Derechos de acceso: info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional |
DOI : https://doi.org/10.1016/j.still.2015.07.008 |
Aparece en las colecciones: Artículos Agroquímica y Medio Ambiente
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La licencia se describe como: Atribución-NonComercial-NoDerivada 4.0 Internacional.