title: [Rapid prediction of annual ring density of Paulownia elongate standing tress using near infrared spectroscopy].
abstract: Rapid prediction of annual ring density of Paulownia elongate standing trees using near infrared spectroscopy was studied. It was non-destructive to collect the samples for trees, that is, the wood cores 5 mm in diameter were unthreaded at the breast height of standing trees instead of fallen trees. Then the spectra data were collected by autoscan method of NIR. The annual ring density was determined by mercury immersion. And the models were made and analyzed by the partial least square (PLS) and full cross validation in the 350-2 500 nm wavelength range. The results showed that high coefficients were obtained between the annual ring and the NIR fitted data. The correlation coefficient of prediction model was 0.88 and 0.91 in the middle diameter and bigger diameter, respectively. Moreover, high coefficients of correlation were also obtained between annual ring density laboratory-determined and the NIR fitted data in the middle diameter of Paulownia elongate standing trees, the correlation coefficient of calibration model and prediction model were 0.90 and 0.83, and the standard errors of calibration (SEC) and standard errors of prediction(SEP) were 0.012 and 0.016, respectively. The method can simply, rapidly and non-destructively estimate the annual ring density of the Paulownia elongate standing trees close to the cutting age.
authors.affiliation: Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
authors.forename: Ze-Hui
authors.initials: ZH
authors.lastname: Jiang
authors.forename: Yu-Rong
authors.initials: YR
authors.lastname: Wang
authors.forename: Ben-Hua
authors.initials: BH
authors.lastname: Fei
authors.forename: Feng
authors.initials: F
authors.lastname: Fu
authors.forename: Chung-Yun
authors.initials: CY
authors.lastname: Hse
mesh_terms: D015203:Reproducibility of Results; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D013997:Time Factors; D014197:Trees / Q000737:chemistry*; D014934:Wood / Q000737:chemistry*