Effects of variable selection and processing of NIR and ATR-IR spectra on prediction of extractives content in Eucalyptus bosistoana heartwood (2019)
The use of quick attenuated total reflectance infrared (ATR-IR) spectroscopy and near infrared (NIR) spectroscopy to predict extractives content (EC) in heartwood of E. bosistoana with partial least squares regression (PLSR) models was studied. Different spectra pre-processing methods and variable selection were tested for calibration optimisation. While variable selection substantially improved the NIR-PLSR models, only small effects were observed for spectra pre-processing methods and ATR-IR-PLSR models. Both of the NIR-PLSR and ATR-IR-PLSR models yielded reliably EC results with high R2 and low root mean square error (RMSE). NIR based models performed better (RMSE 0.9%) than ATR-IR based models (RMSE 1.6%). Analysis showed that the models were based on IR signals assigned to chemical structures known from eucalyptus heartwood extracts. Combined with PLSR and variable selection, both, ATR-IR and the NIR spectroscopy, can be used to quickly predict EC in E. bosistoana, a measure needed in tree breeding and the quality control of for durable timber.
Keywordsnatural durability; Spectra pre-processing; Standard normal variate (SNV); Partial least squares regression (PLSR); Variable selection (sMC)
ANZSRC Fields of Research30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences::300708 - Forestry product quality assessment
30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences::300709 - Tree improvement (incl. selection and breeding)
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Li, Y.; Altaner, C. (University of Canterbury. School of Forestry, 2015)
Mishra G; Garrill A; Altaner CM (Italian Society of Sivilculture and Forest Ecology (SISEF), 2019)Variability in bioactivity and chemical composition of Eucalyptus bosistoana F. Muell. heartwood extracts between individual trees from two different sites were investigated. Combining the results of fungal assays and ...
An approach to quantify natural durability of Eucalyptus bosistoana by near infrared spectroscopy for genetic selection Li Y; Sharma M; Altaner C; Cookson LJ (Elsevier BV, 2020)© 2020 Elsevier B.V. Natural durability within a timber species can be variable. Hence efficient assessments of natural durability are required to ensure quality either through tree breeding or segregation during production. ...