Abstract: In this paper, the widely used electrical resistivity tomography in geophysics was successfully applied to monitor the distribution character of electrical resistivity in the sections of tree trunk, and, with the images obtained, the spatial distribution and dynamic change of water in the trunk were analyzed. The results that the water content in tree trunk sections had an increasing trend from the core to the outside along radial direction. The sections at higher position generally had higher water content than those at lower position, but it was not true when plenty of water was supplied. Even under the sufficient supply of water, the water uptake process in tree trunk was not a kind of saturated propulsive movement, but of an axial preferential movement. By using the electrical resistivity variation data, the preferential flow of water movement in tree trunk sections could be reasonably located.

Key words: Argyrosomus argentatus, Growth, Mortality, Northern South China Sea