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Eucalyptus camaldulensis density and fiber length estimated by near-infrared spectroscopy

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Abstract

Density and fiber length belong to the parameters that are used by the pulping industry as indicators of wood quality for different industrial processes and final paper products. The feasibility of Fourier transform near-infrared (FT-NIR) spectroscopy for the non-destructive evaluation of fiber length and air-dry density of fast-growing E. camaldulensis from Thailand was investigated using 50 samples. NIR spectra taken from solid wood and air-dry density as well as fiber length were used for partial least squares (PLS) regression analyses. It is the first time that the fiber length of E. camaldulensis solid wood could be predicted with high accuracy and precision and that the ratios of performance to deviation (RPD) obtained are the first that fully fulfill the requirements of AACC Method 39-00 (AACC 1999) for screening in breeding programs (RPD ≥ 2.5). The RPDs for cross-validation (test set validation) of the NIR-PLS-R models of 3.3 (3.8) for air-dry density and 3.5 (3.9) for fiber length allow drawing the conclusion that the models are at least applicable for screening in breeding programs as they lie in-between screening (RPD ≥ 2.5) and quality control (RPD ≥ 5). Even when 40% of the samples were removed in cross-validation of the air-dry density model, the RPD is 3.2, which confirms that the model is robust, stable, and well qualified for prediction. The good model statistics obtained in this study might be due to the fact that measurement sites for the measurement of NIR spectra, air-dry density, and fiber lengths were strictly coincided.

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Acknowledgments

This study was partly supported by Grant-in-Aids for Scientific Research from Japan Society for the Promotion of Science (grant numbers 7231 to TI and 19405029 to ST) and The Grater Nagoya Invitation Program Funds for Overseas Researchers and Scientists on Environmental Science Research. We thank Professor Dr. Hiroyuki Yamamoto (Nagoya University) for great cooperation for density and fiber length measurement.

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Authors and Affiliations

  1. Graduate School of Bioagricultural Sciences, Nagoya University, Furo-Cho Chikusa-ku, Nagoya, 464-8601, Japan

    Tetsuya Inagaki, Manfred Schwanninger, Reina Kato, Yohei Kurata & Satoru Tsuchikawa

  2. Department of Chemistry, BOKU—University of Natural Resources and Applied Life Sciences, Vienna, 1190, Vienna, Austria

    Manfred Schwanninger

  3. Kasetsart Agricultural and Agro-Industrial Product Improvement Institute, Kasetsart University, Bangkok, 10900, Thailand

    Warunee Thanapase

  4. Department of Forest Products, Faculty of Forestry, Kasetsart University, Bangkok, 10900, Thailand

    Pratuang Puthson

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  1. Tetsuya Inagaki
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  2. Manfred Schwanninger
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  3. Reina Kato
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  4. Yohei Kurata
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  5. Warunee Thanapase
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  6. Pratuang Puthson
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  7. Satoru Tsuchikawa
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Correspondence to Satoru Tsuchikawa.

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Inagaki, T., Schwanninger, M., Kato, R. et al. Eucalyptus camaldulensis density and fiber length estimated by near-infrared spectroscopy. Wood Sci Technol 46, 143–155 (2012). https://doi.org/10.1007/s00226-010-0379-6

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  • DOI: https://doi.org/10.1007/s00226-010-0379-6

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