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Koncepcja krajobrazu miejskiego przyjaznego srodowisku naturalnemu

100%

Bohl H.

Ekologia i Technika

1993

nr 1

15-19

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Temperature effects in soil water content determined with time domain reflectometry

51%

Halbertsma J., van den Elsen E., Bohl H., Skierucha W.

Zeszyty Problemowe Postępów Nauk Rolniczych

1996

tom 436

The relative permittivity of water decreases with increasing temperature. Therefore, it is likely that the soil water content determined with time domain reflectometry (TDR) is influenced by temperature. We derived a correction based on a refractive mixing model. Our field experiment on a peat soil and laboratory experiments on disturbed sand and loam samples showed that there exist significant temperature effects. The magnitude of these effects is a function of water content and temperature. Both the refractive mixing model-based correction and Ledieu’s correction compensated temperature effects reasonable well. We recommend Ledieu’s correction for its simplicity: only information of the soil temperature is needed to correct the measured water content. The model-based correction needs additional information of the TDR calibration function. Our laboratory experiments on disturbed clay samples however, did not show a temperature effect. We suggest that the electrical conductivity counteracts the temperature effects in clay.

Ograniczanie wyników

1 Ekologia i Technika

1 Zeszyty Problemowe Postępów Nauk Rolniczych

2 Bohl H.

1 Halbertsma J.

1 Skierucha W.

1 van den Elsen E.

1 1996

1 1993

Wyniki wyszukiwania

Koncepcja krajobrazu miejskiego przyjaznego srodowisku naturalnemu

Temperature effects in soil water content determined with time domain reflectometry