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Titre :
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A two-probe method for measuring water content of thin forest floor litter layers using time domain reflectometry
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Auteurs :
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T. Borner ;
M. Johnson ;
P. Rygiewicz ;
AL Et
|
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Type de document :
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article/chapitre/communication
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Année de publication :
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1996
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Format :
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p. 199-207
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Langues :
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= Anglais
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Catégories :
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EAU
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Mots-clés :
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HUMIDITE DU SOL
;
SOL DE FORET
;
MESURE
;
REFLECTOMETRIE TEMPORELLE
;
SONDE DE MESURE
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Résumé :
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Few methods exist that allow non-destructive in situ measurement of the water content of forest floor litter layers (Oa, Oe, and Oi horizons). Continuous non-destructive measurement is needed in studies of ecosystem processes because of the relationship between physical structure of the litter and the biological and chemical processes that take place therein. We developed a method using time domain reflectometry (TDR) to monitor water content in a coniferous forest floor litter layer. Litter and mineral soil horizons were reconstructed in test beds in which TDR probes were placed and measurements taken using a range of litter and mineral soil water contents. Two probes are necessary when litter thickness is less than the spatial sensitivity (6 to 8 cm) of the TDR probes ; one probe placed in the mineral soil and another one at the interface of the Litter and mineral soil. Using this arrangement of TDR probes and simple mathematical relationships, the volumetric water content of forest litter can be estimated continuously.
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Source :
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Soil technology, vol.9
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