Measuring the dielectric permittivity of a plant canopy and its response to changes in plant water status: An application of Impulse Time Domain Transmission

Impulse Time Domain Transmission (ITDT) has been used to measure the complex dielectric permittivity of media such as ethanol, water and variably saturated sand. This paper applies ITDT to measurements of the complex dielectric permittivity of a vegetation canopy. The dielectric permittivity of a ve...

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Bibliographic Details
Published in:Plant and soil 2005, Vol.268 (1-2), p.123-133
Main Authors: Burke, E.J, Harlow, R.C, Ferre, T.P.A
Format: Article
Language:English
Subjects:
Agricultural and forest climatology and meteorology. Irrigation. Drainage
Agricultural and forest meteorology
Agronomy. Soil science and plant productions
Animal and plant ecology
Animal, plant and microbial ecology
Autoecology
Biological and medical sciences
Canopies
canopy
Dielectric materials
dielectric properties
Drought
Economic plant physiology
Ecophysiology
Ethanol
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
impulse time domain transmission
Irrigation scheduling
Moisture content
Permittivity
Physiological ecology
plant-water relations
Plants
Plants and fungi
Remote sensing
Rosemary
Tangents
Transmission lines
Vegetation
Vegetation canopies
Water balance and requirements. Evapotranspiration
water content
Water relations, transpiration, stomata
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Summary:Impulse Time Domain Transmission (ITDT) has been used to measure the complex dielectric permittivity of media such as ethanol, water and variably saturated sand. This paper applies ITDT to measurements of the complex dielectric permittivity of a vegetation canopy. The dielectric permittivity of a vegetation canopy is very close to that of air and only very small changes in its value will occur with changes in plant water status. This paper presents preliminary results demonstrating that ITDT can make repeatable measurements of the complex components of the dielectric permittivity of a plant canopy. Furthermore, ITDT is shown to be highly sensitive to the very small changes in dielectric that occur as a result of changes in plant water status. Based on these preliminary results, there are potential applications foreseen for ITDT in microwave remote sensing, irrigation scheduling, plant physiological ecology, and fire susceptibility.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-004-0303-7