Journal article
Using laboratory-based hyperspectral imaging method to determine carbon functional group distributions in decomposing forest litterfall
Catena, Vol.167, pp.18-27
2018
Abstract
Studying C functional group distributions in decomposing litterfall samples is one of the common methods of studying litterfall decomposition processes. However, the methods of studying the C functional group distributions, such as 13C NMR spectroscopy, are expensive and time consuming and new rapid and inexpensive technologies should be sought. Therefore, this study examined whether laboratory-based hyperspectral image analysis can be used to predict C functional group distributions in decomposing litterfall samples. Hyperspectral images were captured from ground decomposing litterfall samples in the visible to near infrared (VNIR) spectral range of 400-1000 nm. Partial least-square regression (PLSR) and artificial neural network (ANN) models were used to correlate the VNIR reflectance data measured from the litterfall samples with their C functional group distributions determined using 13C NMR spectroscopy. The results showed that alkyl-C, O,N-alkyl-C, di-O-alkyl-C1, di-O-alkyl-C2, aryl-C1, aryl-C2 and carboxyl derivatives could be acceptably predicted using the PLSR model, with R2 values of 0.72, 0.73, 0.71, 0.74, 0.76, 0.75 and 0.63 and ratio of prediction to deviation (RPD) values of 1.86, 1.82, 1.78, 1.71, 1.90, 1.76 and 1.43, respectively. Predicted O,N-alkyl-C, di-O-alkyl-C1, di-O-alkyl-C2, aryl-C1 and aryl-C2 using the ANN model provided R2 values of 0.62, 0.68, 0.69, 0.82 and 0.67 and the RPDs of 1.54, 1.76, 1.52, 2.10 and 1.72, respectively. With the exception of aryl-C1, the PLSR model was more reliable than the ANN model for predicting C functional group distributions given limited amount of training data. Neither the PLSR nor the ANN model could predict the carbohydrate-C and O-aryl-C acceptably. Overall, laboratory-based hyperspectral imaging in combination with the PLSR modelling can be recommended for the analysis of C functional group distribution in the decomposing forest litterfall samples.
Details
- Title
- Using laboratory-based hyperspectral imaging method to determine carbon functional group distributions in decomposing forest litterfall
- Authors
- I Tahmasbian (Author) - Griffith UniversityShahla Hosseini Bai (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringYuzhe Wang (Author) - Nankai University, People's Republic of ChinaSue Boyd (Author) - Griffith UniversityJun Zhou (Author) - Griffith UniversityRoya Esmaeilani (Author) - University Technology Malaysia, MalaysiaZhihong Xu (Author) - Griffith University
- Publication details
- Catena, Vol.167, pp.18-27
- Publisher
- Elsevier BV
- Date published
- 2018
- DOI
- 10.1016/j.catena.2018.04.023
- ISSN
- 0341-8162
- Organisation Unit
- School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99451123702621
- Output Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web Of Science research areas
- Geosciences, Multidisciplinary
- Soil Science
- Water Resources
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Source: InCites