Use of small scale electrical resistivity tomography to identify soil-root interactions during deficit irrigation

摘要: Plant roots activity affect the exchanges of mass and energy between soil atmosphere. However, it is challenging to monitor root-zone because are not visible from surface, root systems undergo spatial temporal variations in response internal external conditions. Therefore, measurements interesting ecohydrologists general, especially important for specific applications, such as irrigation water management. This study demonstrates use small scale three-dimensional (3-D) electrical resistivity tomography (ERT) orange trees irrigated by two different regimes: (i) full rate, which 100% crop evapotranspiration (ETc) provided; (ii) partial drying (PRD), 50% ETc supplied alternate sides tree. We performed time-lapse 3-D ERT on these 5 June 24 September 2015, compared long-term short-term changes before, during, after events. Given temperature pore conductivity, we interpreted data proxies content. The results consistent with transpiration flux temperature. obtained this case indicate that uptake (RWU) processes occur at 0.1 m scale, highlight impact schemes. (C) 2017 Elsevier B.V. All rights reserved.