中国农业科学 ›› 2012, Vol. 45 ›› Issue (4): 706-713.doi: 10.3864/j.issn.0578-1752.2012.04.011

• 园艺 • 上一篇    下一篇

基于中红外光声光谱的梨树叶片氮含量的测定

 赵化兵, 李艳丽, 谢凯, 宋晓晖, 董彩霞, 徐阳春   

  1. 1.南京农业大学资源与环境科学学院,南京210095
  • 收稿日期:2011-04-14 出版日期:2012-02-15 发布日期:2011-12-16
  • 通讯作者: 通信作者董彩霞,Tel:025-84396393;E-mail:cxdong@njau.edu.cn
  • 作者简介:赵化兵,E-mail:2009103130@njau.edu.cn
  • 基金资助:

    现代农业产业技术体系专项资金资助(CARS-29-15)

Fast Determination of Nitrogen Status in Pear Leaf Using Mid-Infrared Photoacoustic Spectroscopy

 ZHAO  Hua-Bing, LI  Yan-Li, XIE  Kai, SONG  Xiao-Hui, DONG  Cai-Xia, XU  Yang-Chun   

  1. 1.南京农业大学资源与环境科学学院,南京210095
  • Received:2011-04-14 Online:2012-02-15 Published:2011-12-16

摘要: 【目的】利用光谱学手段,寻找一种快速、简单的梨树叶片中氮含量的诊断方法。【方法】应用傅里叶变换中红外光声光谱仪(FTIR-PAS)研究环渤海湾地区4个梨试验站200个梨园叶片的光声光谱特征,采用偏最小二乘法(PLSR)对叶片氮素含量进行建模和预测。【结果】通过分析PLSR中的主成分数和样本氮素浓度范围对PLSR定量预测能力的影响,当烟台、泰安、昌黎、营口试验站及综合的主成分数分别为6、6、6、4和8时,所建模型最优;用所建的5个模型预测了未知样品的氮素含量,发现预测误差(RMSEP)介于1.26—2.18 g•kg-1,预测相关系数(Rp)介于0.644—0.806。【结论】FTIR-PAS与PLSR相结合建立的预测模型可满足梨树叶片氮素含量快速、方便检测的需要。

关键词: 梨, 叶片氮含量, 中红外光声光谱, 偏最小二乘法

Abstract: 【Objective】 The aim was to find a fast and convenient method for prediction of the nitrogen status in pear leaves by technique of spectroscopy.【Method】Pear leaves were collected from 200 dominant pear orchards in four pear experimental stations scattered in three provinces (Shandong, Hebei and Liaoning) around the Bohai Gulf which is affiliated to National Pear Industrial Technology System. Fourier transform mid-infrared photoacoustic spectra (FTIR-PAS) of 200 pear leaf samples were recorded, and Partial Least Squares Regression (PLSR) was applied in the modelings of nitrogen content in pear leaf. 【Result】 The effects of the quantities of Principal Components (PCs) in PLSR and the scope of nitrogen concentrations in samples on the quantitative predicting capacity of PLSR were analyzed. It was found that the established model was of highest accuracy when the quantities of major ingredients in the respective experimental stations, which was referred to Yantai, Tai'an, Changli, Yingkou, and the total samples, as a whole were 6, 6, 6, 4 and 8, respectively. It was also found that when predicting the nitrogen contents in samples by the five established models, Root Mean Square Error of Prediction (RMSEP) was ranging from 1.26 g•kg-1 and 2.18 g•kg-1 and the correlation coefficient of Prediction(Rp) was between 0.644 and 0.806.【Conclusion】The results indicated that it is a new fast and convenient technique for predicting the leaf N status of fruit tree by using the Mid-Infrared Photoacoustic Spectroscopy.

Key words: pear, leaf nitrogen content, mid-infrared photoacoustic spectroscopy, partial least squares regression