植物生态学报 ›› 2006, Vol. 30 ›› Issue (1): 78-82.DOI: 10.17521/cjpe.2006.0011

• 研究论文 • 上一篇    下一篇

基于连续统去除法的水稻氮素营养光谱诊断

张金恒1,2()   

  1. 1 青岛科技大学材料与环境科学学院,山东青岛 266042
    2 浙江大学农业遥感与信息技术应用研究所,杭州 310029
  • 收稿日期:2005-02-02 接受日期:2005-05-24 出版日期:2006-02-02 发布日期:2006-01-30
  • 作者简介:E-mail:zhangjinheng@qust.edu.cn
  • 基金资助:
    国家自然科学基金项目(30070444);青岛科技大学科研启动基金

RICE NITROGEN NUTRITION DIAGNOSIS USING CONTINUUM-REMOVED REFLECTANCE

ZHANG Jin-Heng1,2()   

  1. 1 College of Material and Environmental Science, Qingdao University of Science and Technology, Qingdao, Shandong 266042, China
    2 Institute of Agriculture Remote Sensing & Information System Application, Zhejiang Univeristy, Hangzhou 310029, China
  • Received:2005-02-02 Accepted:2005-05-24 Online:2006-02-02 Published:2006-01-30

摘要:

该文将矿质分析及岩石光谱特征分析中普遍使用的连续统去除法引入水稻(Oryza sativa)叶片反射光谱特征的分析中。分析连续统去除光谱反射率和连续统去除一阶微分光谱,发现随着氮素水平的增加连续统去除光谱反射率下降。分析连续统去除光谱吸收特征参数与叶片全氮量相关性,这些参数包括:吸收峰左半端的面积(A1)、吸收峰整体面积(A)、对称度(S)和连续统去除最小反射率(Dhc),结果表明连续统去除光谱吸收特征参数与叶片全氮量之间负相关性显著(均通过0.01水平的显著相关检验)。考虑到氮素营养在植物体内转移的营养原理,在分蘖期、孕穗期和抽穗期这3个关键生育期内分别针对水稻第一完全展开叶和第三完全展开叶建立连续统去除光谱吸收特征参数评价水稻氮素营养的回归模型。结果表明在估算第三完全展开叶氮素营养时,3个生育期内建模使用的回归量均为吸收峰整体面积A,而且在3个生育期内模型的决定系数较高且比较稳定。但是,第一完全展开叶建模使用的回归量(续统去除光谱吸收特征参数)不完全一致,这可能是由于氮素营养在植物体内转移导致。尽管连续统去除法诊断水稻氮素营养的一些机理还有待于进一步深入研究,但是该研究证明了运用水稻鲜叶片连续统去除反射光谱进行定性和定量评价水稻氮素营养在方法上是可行的。

关键词: 反射光谱, 连续统去除, 水稻, 氮素营养

Abstract:

A new method was developed for estimating the nitrogen nutrition of rice using continuum-removed reflectance. The most upper fully expanded leaves and the third fully expanded leaves were sampled during their important growth stages (tiller stage, booting stage and heading stage), and their concentrations of nitrogen and their reflectance measured. The value of the continuum-removed reflectance (550-750 nm) decreased as the nitrogen levels increased. Several properties of the continuum-removed reflectance spectra of fresh rice leaves were calculated, including the continuum-removed reflectance value, the minimum of the continuum-removed absorption features, symmetry, total area of absorption peak and left area of the absorption peak. High correlations were found between the spectral properties of the continuum-removed reflectance and leaf nitrogen concentrations. Stepwise multiple linear regression was used to select parameters that were most highly correlated with the nitrogen concentration of the leaf samples. Results of this research showed that total area of absorption peak was the best predictor of nitrogen levels in the third fully expanded leaves throughout their different growth stages (tiller, booting and heading stage). However, for the most upper fully expanded leaves, the significant model parameters included in the model were not always consistent. The basis for this method for diagnosing rice nitrogen nutrition on fresh leaves is not very clearly understood, but this research has demonstrated that continuum-removed reflectance is a feasible method.

Key words: Spectral reflectance, Continuum-removed, Nitrogen nutrition, Rice