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Texture and electrical conductivity effects on temperature dependency in time domain reflectometry

Persson, Magnus LU and Berndtsson, Ronny LU (1998) In Soil Science Society of America Journal 62(4). p.887-893
Abstract
If not accounted for, temperature effects on the water content and electrical conductivity measured with time domain reflectometry (TDR) will introduce significant errors. In this study, an automated TDR system was used to quantify the temperature dependence of the apparent dielectric constant and electrical conductivity in wet soils. Sandy, clayey, and organic soils were used to examine the effect of soil texture. The temperature correction factor for water content measurements was predicted, by using different dielectric mixing models, to lie between -0.00253 and -0.00419 theta degrees C-1, the negative value of the temperature correction factor indicating a decrease in the water content measurements with increasing temperature. These... (More)
If not accounted for, temperature effects on the water content and electrical conductivity measured with time domain reflectometry (TDR) will introduce significant errors. In this study, an automated TDR system was used to quantify the temperature dependence of the apparent dielectric constant and electrical conductivity in wet soils. Sandy, clayey, and organic soils were used to examine the effect of soil texture. The temperature correction factor for water content measurements was predicted, by using different dielectric mixing models, to lie between -0.00253 and -0.00419 theta degrees C-1, the negative value of the temperature correction factor indicating a decrease in the water content measurements with increasing temperature. These values agreed wed with the correction factor measured in sandy soils: -0.00269 theta degrees C-1. In soils with large specific surface, i,e,, clayey and organic soils, however, the temperature dependence was significantly lower, Large specific surface combined with high soil solution electrical conductivity resulted in a positive correction factor, i.e,, water content measurements increased with increases in temperature, The temperature dependence of the bulk electrical conductivity was investigated using different soils and soil solutions. The temperature dependence was close to that of the soil solution and was independent of soil texture. (Less)
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organization
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Contribution to journal
publication status
published
subject
in
Soil Science Society of America Journal
volume
62
issue
4
pages
887 - 893
publisher
Soil Science Society of Americ
external identifiers
  • scopus:0032122385
  • wos:000075455900006
ISSN
0361-5995
DOI
language
English
LU publication?
yes
id
7d400e80-3e80-454b-8235-73682d1cdfd3
date added to LUP
2018-05-30 09:29:52
date last changed
2018-06-07 16:00:50
@article{7d400e80-3e80-454b-8235-73682d1cdfd3,
  abstract     = {If not accounted for, temperature effects on the water content and electrical conductivity measured with time domain reflectometry (TDR) will introduce significant errors. In this study, an automated TDR system was used to quantify the temperature dependence of the apparent dielectric constant and electrical conductivity in wet soils. Sandy, clayey, and organic soils were used to examine the effect of soil texture. The temperature correction factor for water content measurements was predicted, by using different dielectric mixing models, to lie between -0.00253 and -0.00419 theta degrees C-1, the negative value of the temperature correction factor indicating a decrease in the water content measurements with increasing temperature. These values agreed wed with the correction factor measured in sandy soils: -0.00269 theta degrees C-1. In soils with large specific surface, i,e,, clayey and organic soils, however, the temperature dependence was significantly lower, Large specific surface combined with high soil solution electrical conductivity resulted in a positive correction factor, i.e,, water content measurements increased with increases in temperature, The temperature dependence of the bulk electrical conductivity was investigated using different soils and soil solutions. The temperature dependence was close to that of the soil solution and was independent of soil texture.},
  author       = {Persson, Magnus and Berndtsson, Ronny},
  issn         = {0361-5995},
  language     = {eng},
  number       = {4},
  pages        = {887--893},
  publisher    = {Soil Science Society of Americ},
  series       = {Soil Science Society of America Journal},
  title        = {Texture and electrical conductivity effects on temperature dependency in time domain reflectometry},
  url          = {http://dx.doi.org/},
  volume       = {62},
  year         = {1998},
}