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Hydraulic conductivity as influenced by stoniness in degraded drylands of Chile

Koen Verbist (UGent) , Jan Baetens (UGent) , Wim Cornelis (UGent) , Donald Gabriëls (UGent) , Claudia Torres and Guido Soto
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Abstract
Infiltration measurements in and, stony soils are notoriously variable in visually homogeneous areas, and have been reported to be influenced by embedded stone fragments. This Study aimed to identify the influence of rock fragment contents, orientation, and position within a small and watershed on hydraulic conductivity in northern Chile. Two different measurement techniques were used, a single-ring infiltrometer with constant ponding head and a tension infiltrometer, which were applied at both an undisturbed field site (44 locations along three transects) and on the disturbed < 2-mm soil fraction from the same locations. Variations in saturated and unsaturated hydraulic conductivities were observed when using different calculation methods, adding to the observed variability For saturated conditions, only small differences in conductivities were observed between two calculation methods, whereas unsaturated hydraulic conductivities calculated by five different methods showed more important variations. Stone fragment content correlated significantly with both saturated and unsaturated conductivities, probably due to a positive correlation between stone content and coarse lacunar pore space. Slope orientations with higher amounts of stone fragments gave higher infiltration rates, as well as transects with steeper slopes and more, but smaller, rock fragments. When evaluating differences in infiltration rates observed along three transects in the watershed, variability could be mainly attributed to stone fragment content influences.
Keywords
DISC INFILTROMETER, SINGLE-RING INFILTROMETERS, TENSION INFILTROMETER, 3-DIMENSIONAL ANALYSIS, GENERALIZED SOLUTION, NUMERICAL INVERSION, WATER-RETENTION, TRANSIENT FLOW, POROUS-MEDIA, SOIL

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Chicago
Verbist, Koen, Jan Baetens, Wim Cornelis, Donald Gabriëls, Claudia Torres, and Guido Soto. 2009. “Hydraulic Conductivity as Influenced by Stoniness in Degraded Drylands of Chile.” Soil Science Society of America Journal 73 (2): 471–484.
APA
Verbist, K., Baetens, J., Cornelis, W., Gabriëls, D., Torres, C., & Soto, G. (2009). Hydraulic conductivity as influenced by stoniness in degraded drylands of Chile. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 73(2), 471–484.
Vancouver
1.
Verbist K, Baetens J, Cornelis W, Gabriëls D, Torres C, Soto G. Hydraulic conductivity as influenced by stoniness in degraded drylands of Chile. SOIL SCIENCE SOCIETY OF AMERICA JOURNAL. 2009;73(2):471–84.
MLA
Verbist, Koen, Jan Baetens, Wim Cornelis, et al. “Hydraulic Conductivity as Influenced by Stoniness in Degraded Drylands of Chile.” SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 73.2 (2009): 471–484. Print.
@article{525205,
  abstract     = {Infiltration measurements in and, stony soils are notoriously variable in visually homogeneous areas, and have been reported to be influenced by embedded stone fragments. This Study aimed to identify the influence of rock fragment contents, orientation, and position within a small and watershed on hydraulic conductivity in northern Chile. Two different measurement techniques were used, a single-ring infiltrometer with constant ponding head and a tension infiltrometer, which were applied at both an undisturbed field site (44 locations along three transects) and on the disturbed < 2-mm soil fraction from the same locations. Variations in saturated and unsaturated hydraulic conductivities were observed when using different calculation methods, adding to the observed variability For saturated conditions, only small differences in conductivities were observed between two calculation methods, whereas unsaturated hydraulic conductivities calculated by five different methods showed more important variations. Stone fragment content correlated significantly with both saturated and unsaturated conductivities, probably due to a positive correlation between stone content and coarse lacunar pore space. Slope orientations with higher amounts of stone fragments gave higher infiltration rates, as well as transects with steeper slopes and more, but smaller, rock fragments. When evaluating differences in infiltration rates observed along three transects in the watershed, variability could be mainly attributed to stone fragment content influences.},
  author       = {Verbist, Koen and Baetens, Jan and Cornelis, Wim and Gabriëls, Donald and Torres, Claudia and Soto, Guido},
  issn         = {0361-5995},
  journal      = {SOIL SCIENCE SOCIETY OF AMERICA JOURNAL},
  keywords     = {DISC INFILTROMETER,SINGLE-RING INFILTROMETERS,TENSION INFILTROMETER,3-DIMENSIONAL ANALYSIS,GENERALIZED SOLUTION,NUMERICAL INVERSION,WATER-RETENTION,TRANSIENT FLOW,POROUS-MEDIA,SOIL},
  language     = {eng},
  number       = {2},
  pages        = {471--484},
  title        = {Hydraulic conductivity as influenced by stoniness in degraded drylands of Chile},
  url          = {http://dx.doi.org/10.2136/sssaj2008.0066},
  volume       = {73},
  year         = {2009},
}

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