期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 62, 期 1, 页码 351-358出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erq276
关键词
Absorbing root surface; impedance analysis; lumped electrical model; non-destructive; root; willow
资金
- China Scholarship Council (CSC, China)
- Faculty of Forest Sciences, University of Joensuu, Niemi-Saatio (Finland)
- Finnish Forest Research Institute
Information on plant roots is increasingly needed for understanding and managing plants under various environmental conditions, including climate change. Several methods have been developed to study fine roots but they are either destructive or cumbersome, or may not be suitable for studies of fine root functionality. Electrical impedance, resistance, and capacitance have been proposed as possible non-destructive measures for studying roots. Their use is limited by a lack of knowledge concerning the electrical circuit of the system. Electrical impedance spectroscopy (EIS) was used for hydroponically raised willows (Salix schwerinii) to estimate the root system size. The impedance spectra were investigated in three experimental set-ups and the corresponding appropriate lumped models were formulated. The fit of the proposed lumped models with the measured impedance spectra data was good. The model parameters were correlated with the contact area of the roots and/or stems raised in the hydroponic solution. The EIS method proved a useful non-destructive method for assessing root surface area. This work may be considered to be a new methodological contribution to understanding root systems and their functions in a non-destructive manner.
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