Variable selection in near infrared spectra for the biological characterization of soil and earthworm casts

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• 作者：Lauric Cé ; cillon ; Nathalie Cassagne ; Sonia Czarnes ; Raphaë ; l Gros ; Jean-Jacques Brun
• 关键词：NIRS ; PLSR ; Wavelength selection ; Soil biogenic structures ; Soil macrofauna ; Microbiological activity
• 刊名：Soil Biology & Biochemistry
• 出版年：2008
• 出版时间：July 2008
• 年：2008
• 卷：40
• 期：7
• 页码：1975-1979
• 全文大小：277 K

文摘

Near infrared reflectance spectroscopy (NIRS) was used to predict six biological properties of soil and earthworm casts including extracellular soil enzymes, microbial carbon, potential nitrification and denitrification. Partial least squares regression (PLSR) models were developed with a selection of the most important near infrared wavelengths. They reached coefficients of determination ranging from 0.81 to 0.91 and ratios of performance-to-deviation above 2.3. Variable selection with the variable importance in the projection (VIP) method increased dramatically the prediction performance of all models with an important contribution from the 1750–2500 nm region. We discuss whether selected wavelengths can be attributed to macronutrient availability or to microbial biomass. Wavelength selection in NIR spectra is recommended for improving PLSR models in soil research.