基于小波消噪的植物电信号频谱特征分析  

The Analysis on Spectrum Characteristic of Plant Electrical Signal Based on Wavelet De-Noising

作　　者：张晓辉[1] 余宁梅[1] 习岗[2] 孟晓丽[2] 

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]西安理工大学理学院,陕西西安710054

出　　处：《西安理工大学学报》2011年第4期411-416,共6页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(50977079);陕西省教育厅专项科研计划基金资助项目(09JK667)

摘　　要：利用小波软阈值消噪法和快速傅里叶变换研究不同温度条件下芦荟叶片电信号的基本特征及变化规律。通过植物电信号谱边缘频率(SEF)、谱重心频率(SGF)和功率谱熵(PSE)研究不同温度下芦荟(Aloe vera L.)叶片电信号功率谱的变化。结果表明,芦荟的电信号是一种强度为mV数量级、频率分布在5 Hz以下的低频信号;随着温度的升高,电信号的SEF和SGF向高频段移动,细胞活动受到激发,PSE急剧增加;在升温过程中SEF、SGF和PSE三者的变化趋势趋于一致,PSE与SGF的变化之间有很强的关联性,因而植物电信号PSE或SGF的变化可以作为叶片细胞响应外界环境变化的灵敏指标,而对植物生长发育的生理生化过程实施科学调控。The paper studies the basic characteristics and the changing laws of aloe electrical signals under different temperatures based on wavelet soft threshold de-noising method and Fast Fourier Transform.The spectral edge frequency（SEF）,spectral gravity frequency（SGF） and power spectral entropy（PSE） of plant electrical signals are used to study the changes of power spectrum of aloe electrical signals under different temperatures.The results show that the magnitude of aloe electrical signal is a strength of mV,and the frequency is below 5 Hz.The SEF and SGF in aloe leaves move to the high frequency as the temperature increases,and the PSE of the electrical signal has a dramatic increase.The study reveals that the SEF,SGF and PSE have the consistent trend to change and there is a significant relevance between PSE and SGF during the process of raising temperature.It is considered that the changes of the PSE and SGF in aloe leaves can be used as sensitive index of external environment change in leaf cells,and then implement scientific regulators of physiological and biochemical process of plant growth and development.

关 键 词：植物电信号 小波分析 功率谱 温度 芦荟 

分 类 号：TN911.72[电子电信—通信与信息系统]