| 邢东兴,常庆瑞.受（霜）冻果树光谱特征及其受冻级别的定量化测评——以酥梨、砂红桃、红富士苹果树为例[J].干旱地区农业研究,2009,27(2):265~270 |
| 受（霜）冻果树光谱特征及其受冻级别的定量化测评——以酥梨、砂红桃、红富士苹果树为例 |
| 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 |
| 中文关键词: 果树花期霜冻 花朵受冻级别 光谱特征 定量测评 |
| 英文关键词:frost during fruit tree flowering spectral characteristics level of fruit tree blossoms suffering frost quantitative evaluation |
| 基金项目:国家自然科学基金项目(30571527) |
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| 中文摘要: |
| 此研究试图探寻受霜冻程度不同的果树的反射光谱特征,并尝试利用光谱数据对果树的受冻程度进行定量化测评。首先,分别对酥梨、砂红桃、红富士3种果树4个受冻级别的花朵的光谱反射率进行了预处理。随后,对光谱数据以9种不同的波长为间隔进行了一阶微分变换。最后,利用优选的3组微分波谱在其对应的特征波段区间内的积分求值,分别对3种果树花朵的受冻程度进行了定量化评估建模。主要结论为:①每种果树各级受冻花朵的反射波谱均在360 nm附近出现了最低谷区,而在360~40 nm的波段区间均出现了坡度最大的陡坎,陡坎坡度的大小顺序为:未受冻级别>轻度受冻级别>中度受冻级别>重度受冻级别,并且陡坎的最大坡度均出现在400 nm附近;②当波长间隔同时设为9 nm时,酥梨、砂红桃、红富士苹果树的各级受冻花朵的微分波谱分别在396±20,400±20,410±20 nm波段区间内的积分求值差异最大;③利用上述的3组积分值,可分别对3种果树花朵的受冻级别建立定量化评估模型。 |
| 英文摘要: |
| 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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