环境因子对植物电信号的影响研究

发布时间：2018-05-27 00:03

本文选题：植物电 + 环境因子控制　；参考：《天津职业技术师范大学》2017年硕士论文

【摘要】：植物电信号是植物对外界刺激所反映的一种重要物理信号,随着计算机和检测技术的发展,植物电信号也在此基础上得到了迅速的发展,未来有可能产生一门新的学科—植物电子学。但我国对植物电信号的研究起步较晚,研究成果不是很多,本文在前人已有研究的基础上,对几种植物及其电信号做了比较系统的研究。本研究的主要内容如下:1.对环境因子及采集系统进行设计与研究,环境因子控制由植物生长柜完成,本文主要介绍了控制光照和浓度,而采集系统主要包括电极、采集装置(包括硬件与软件LabVIEW)、屏蔽措施、计算机及其处理软件,选用小波消噪,现场对噪声和电信号进行采集,取得良好效果。2.研究方法采用对植物电信号的时域分析、频域分析以及时频域分析,时域分析方法包括对采集到的植物电信号计算其均值、峰峰值、方差以及均方差等特征值,频域分析方法采用AR功率谱法进行分析研究,由功率谱图对植物电信号频域特性进行直观的研究,为了更好地说明频域特性,分别计算了谱重心频率、谱边缘频率和功率谱熵三个特征值,时频域分析方法采用小波变换、短时傅里叶变换以及小波分解对植物电信号进行了较为系统的分析。3.研究不同环境因子对植物电信号的影响,由于环境因子众多,本文分别选用光照因子和浓度作为可控因子,研究三种单子叶植物在不同光照条件、浓度下的植物电信号变化以及结合时域、频域、时频域分析,以此找到各种植物最适宜的环境条件(最适宜光照条件和最适宜浓度),芦荟的最佳光照区间为50%-80%光照度(24025-29459Lux),红掌的最佳光照区间是35%-65%光照度(19240-27919Lux),白掌的最佳光照区间大致也为35%-65%光照度(19240-27919Lux)。而三种植物的最佳浓度均在1000ppm以上。4.将光照与浓度联合控制作为可控因子,观察两种因子协同作用对植物电信号的影响,在红掌最佳浓度下再次增加光照度,对植物电信号做特性分析,结果表明,高浓度下植物所需最佳光照度会继续加强,在1000ppm浓度下,红掌最佳光照度区间上升为80%-100%光照度,在这一区间光合作用最强。为温室调控下和光照度联合控制奠定基础。
[Abstract]:Plant electrical signal is an important physical signal reflected by plant stimulation to the outside world. With the development of computer and detection technology, plant electrical signal has also been developed rapidly on this basis. A new discipline, plant electronics, is likely to emerge in the future. However, the research on plant electrical signals in China started relatively late, and the research results are not many. Based on the previous studies, this paper makes a systematic study on several plants and their electrical signals. The main contents of this study are as follows: 1. The design and research of environmental factors and collecting system are carried out. The control of environmental factors is accomplished by the plant growth cabinet. This paper mainly introduces the control of light and concentration, and the collection system mainly includes electrodes. The acquisition device (including hardware and software LabVIEW, shielding measures, computer and its processing software, wavelet de-noising, scene acquisition of noise and electrical signals) has achieved good results. Methods the time domain analysis and frequency domain analysis were used to analyze the plant electrical signals in time domain. The time domain analysis methods included calculating the mean value, peak value, variance and mean square deviation of the collected plant electrical signals. The frequency domain analysis method is based on AR power spectrum method. The frequency domain characteristics of plant electrical signals are studied intuitively by power spectrum map. In order to better explain the frequency domain characteristics, the frequency of the center of gravity of the spectrum is calculated separately. There are three eigenvalues of spectral edge frequency and power spectral entropy. Wavelet transform, short time Fourier transform and wavelet decomposition are used to analyze plant electrical signals systematically. The effects of different environmental factors on plant electrical signals were studied. Because of many environmental factors, illumination factor and concentration were selected as controllable factors respectively, and three monocotyledonous plants were studied under different illumination conditions. The changes of plant electrical signals at concentration and their combination with time-domain, frequency-domain, time-frequency domain analysis, In order to find the most suitable environmental conditions (optimum light condition and optimum concentration) for all kinds of plants, the optimum illumination range of aloe is 50-80% light intensity 24025-29459LuxA, the best illumination interval of red palm is 35-65% light intensity 19240-27919Luxo, the best light interval of white palm is the best light interval. Roughly 35-65% illumination 19240-27919 LuxA. The optimum concentration of the three plants was above. 4. 1000ppm. With the combination control of illumination and concentration as controllable factor, the effect of synergistic effect of two factors on plant electrical signal was observed, and the illuminance was increased again at the best concentration of clam, and the characteristic of plant electrical signal was analyzed. At high concentration, the optimum light intensity of plant will continue to strengthen. At the concentration of 1000ppm, the optimum light intensity range of red paw rose to 80-100%, and the photosynthesis was the strongest in this region. It lays a foundation for the joint control of light intensity and greenhouse control.
【学位授予单位】：天津职业技术师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q945;TP274.2

【参考文献】