摘要
采用可见／近红外光谱技术快速定量检测上海青菜叶片的含氮量，得到叶片含氮量的光谱图，分别运用MLR和PLSR2种化学计量学方法模拟含氮量与光谱的关系，并建立模型。结果表明：上海青菜的指纹区在430-435nm、500～550nm、605～620nm，PLSR在准确性方面优于MLR，MLR在稳定性方面优于PLSR，模型的决定系数均在0．82以上，故此近红外光谱技术可用于估测上海青菜叶片氮素。
The spectrogram of pakchoi leaves＇ nitrogen content was obtained through rapid and quantitative determination of the leaves＇nitrogen content by visible/near infrared spectroscopy, the re lationship between the nitrogen contents and the spectra was simulated by using both MLR and PLSR methods of chemometrics, and the models were established. The results showed that the fingerprint re gions of Shanghai pakchoi were 430 435 nm,500 to the MLR in accuracy but inferior to the MLR 550 nm and 605 620 nm,the PLSR was superior in stability, and the determination coefficients of both MLR and PLSR models were above 0.82,indicating that near infrared spectroscopy could be used to estimate the nitrogen content of Shanghai pakchoi leaves.
出处
《上海农业学报》
CSCD
北大核心
2013年第3期36-39,共4页
Acta Agriculturae Shanghai
基金
上海市科委区县合作重大项目(08DZ1980903)资助
关键词
含氮量
定量分析
快速测定
VNIR
化学计量学方法
Nitrogen content
Quantitative analysis
Rapid determination
VNIR
Methods of che-mometrics
