| Characteristics of spectral reflectance of blossoms frosted to different degrees and quantitative evaluation of degrees of blossoms frosted by spectral analysis — With Crisp pear Shahong peach and Fuji apple trees as examples |
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| DOI：10.7606/j.issn.1000-7601.2009.02.50 |
| Key Words: frost during fruit tree flowering spectral characteristics level of fruit tree blossoms suffering frost quantitative evaluation |
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| Abstract: |
| The study attempts to explore the characteristics of the spectral reflectance of fruit tree blossoms suffering frost with different degrees, and try to evaluate quantitatively the levels of fruit tree blossoms suffering frost by spectra data.Firstly, we pretreat the spectra reflectance data of the blossoms of three species of fruit trees suffering frost with four levels, and analyze the spectra characteristics of the frosted fruit tree blossoms.Subsequently, we transform the spectra data by the first derivative with nine kinds of different wavelength intervals, and find out the special wavelength and special wavelength range, and select three groups of specific derivative spectra in the transformation results.Finally, we build the quantitative assessment models for the frosted blossoms of three species of fruit trees using the integral values which are calculated by three selected groups of specific differential spectra within the corresponding special wavelength range respectively.The main conclusions are: ① The reflectance spectroscopy of the blossoms suffering frost at each level of each species of the fruit trees emerges the lowest valley area near 360 nm, and emerges the scarp with the largest slope within the wavelength range from 360 nm to 440 nm, the order of the slopes is: no frost suffering > light frost suffering > moderate frost suffering > severe frost suffering, the largest slopes of the four scarps are all near 400 nm;② When the wavelength interval is set at 9 nm, the integral values calculated by the derivative spectra of the frosted blossoms at all levels of Crisp pear, Shahong peach, Fuji apple trees within the wavelength range 396±20 nm, 400±20 nm, 410±20 nm are respectively the largest;③ We establish respectively quantitative evaluation models based on the three groups of integral values which mentioned in ②. |
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