Publication: Relaciones agua-suelo-vegetación.-Evaluation of two methods for measuring saturated hydraulic conductivity of soils under two vegetation covers
Authors
Rubio, C.M. ; Josa, R. ; Poyatos, R. ; Llorens, P. ; Gallart, F. ; Latron, J. ; Ferrer, F.
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info:eu-repo/semantics/other
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Abstract
ABSTRACT
The main goal of this work is to determine and to evaluate the saturated hydraulic
conductivity for a silt loam soil in field and laboratory conditions. The experimental area was
located in the Vallcebre research catchments, in headwaters of the Llobregat River (NE
Spain). Hydraulic conductivity was measured in the field using the Guelph permeameter and
field saturated hydraulic conductivity (Kfs) based on Elrick equation was calculated. The
Guelph permeameter measures were made in two conditions (dry and wet) and in profiles
below two vegetation covers (meadows and forest). To determine the saturated hydraulic
conductivity at the laboratory (Ks) the constant head permeameter was used. The average Kfs
values for the wet period was about 2 cm·h-1. During the dry period, both soil profiles
presented higher values, about 7.5 cm·h-1. Under laboratory conditions, mean observed Ks
values were between 12 and 25 cm·h-1. The relationship Kfs/Ks was of 0.1 cm·h-1 in wet
conditions and about 0.4 cm·h-1 in dry conditions. The results indicated significant differences
between both methods and between both seasons. Differences can be explained by the
anisotropy of soils as a consequence of vegetation root system that promotes preferential
flows paths.
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