Journal
FORESTS
Volume 13, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/f13081198
Keywords
plant vitality; inner fringing impedance; sensor; stem water content; external environmental stress
Categories
Funding
- Beijing Natural Science Foundation [6214034]
- National Key Research and Development Program of China [2017YFD0600901]
- National Natural Science Foundation of China [62006008, 62173007]
- Research Foundation for Youth Scholars of Beijing Technology and Business University [QNJJ2022-37]
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Plant vitality is an important indicator of plant health, and stem water content (StWC) can be used as a new parameter to assess plant vitality. By using a novel fringing impedance sensor, StWC can be measured online, in real-time, and nondestructively, showing strong correlations with physiological parameters related to plant vitality.
Plant vitality is an important indicator of plant health. Previous studies have often assessed plant vitality using related physiological parameters, but few studies have examined the effects of changes in plant vitality on stem water content (StWC), which can be measured online, in real time, and nondestructively using a novel fringing impedance sensor. In the present study, the sensor calibration results showed a linear fitting relationship between the sensor output voltage and StWC, with coefficients reaching 0.96. The coefficients of correlations between StWC and four plant physiological parameters related to plant vitality (net photosynthetic rate, transpiration rate, stomatal conductance, and intercellular carbon dioxide concentration) were more than 0.8, indicating that StWC can be used to characterize plant vitality to a certain extent. A comparison between plants with normal vitality and weakened vitality showed that the self-regulation ability of plants gradually weakened as the plant vitality decreased, the diurnal mean of StWC lowered, and the diurnal range of StWC increased. In conclusion, StWC can be used as a new parameter to assess plant vitality.
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