Study and evaluation of plant electrical signal processing method

Plant electrical signal is a kind of weak signal which is generated when the resting potential of plant cells or tissues changes under outside stimuli and can be transmitted among plant cells and tissues. Important physiological information of plant can be obtained through processing and analysis of the signal. Based on characteristics of plant electrical signal, this paper analyses electrical signals of plant in time domain, frequency domain and time-frequency domain and discusses advantages and existing problems of each processing method. Result shows that time-frequency analysis reflects substantive characteristics of plants signals more deeply and effectively than another two methods. This study provides certain theoretical references and analytic bases for future studies in this area.