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Influence of slope gradient and aspect on soil hydraulic conductivity measured with tension infiltrometer

field study in the central zone of Chile

Casanova, Manuel P. (1998). Influence of slope gradient and aspect on soil hydraulic conductivity measured with tension infiltrometer. ["eprint_fieldopt_monograph_type_und_thesis" not defined]. Uppsala: (NL, NJ) > Dept. of Soil Sciences > Div. of Hydrotechnics, Sveriges lantbruksuniversitet. Avdelningsmeddelande / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avdelningen för lantbrukets hydroteknik ; 98:3
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Abstract

The tension infiltrometer is a device for measuring unsaturated hydraulic conductivity [KC'!')] in the larger soil pores. By regulating the supply pressure head during infiltration with the help of a bubble tower, it is possible to control the size range of soil pores that transmit water. This technique was used in the characterization of infiltration in two rainfed hillsides (north and south exposure) of the central zone of Chile. The results showed smaller K(Ψ) values for the north exposure, with accentuated differences close to saturation (zero pressure head). These differences may have been attributed to differences in texture and organic matter contents observed for the two exposures. Furthermore, K(Ψ) presented a tendency to increase with increasing slope. This tendency, observed also in complementary laboratory works was to a part explained by the deviation from requirements of measurements on level ground. A way of adjusting for slope influence is proposed. In the field study, after adjustment, the differences in K(Ψ) were attributed to the differences in the vertical and lateral hydraulic conductivity and to the development of surface sealing occurring in low slope plots. Finally, a stepwise regression analysis showed that K(Ψ) parameters were explained by the slope of the hillside and the proportion of textural separates in the soil surface.

Authors/Creators:Casanova, Manuel P.
Title:Influence of slope gradient and aspect on soil hydraulic conductivity measured with tension infiltrometer
Subtitle:field study in the central zone of Chile
Series/Journal:Avdelningsmeddelande / Sveriges lantbruksuniversitet, Institutionen för markvetenskap, Avdelningen för lantbrukets hydroteknik (0282-6569)
Year of publishing :1998
Number:98:3
Number of Pages:50
Place of Publication:Uppsala
Publisher:Institutionen för markvetenskap, avdelningen för lantbrukets hydroteknik
ISSN:0282-6569
Language:English
Publication Type:Report
Refereed:No
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science
Keywords:tension infiltrometer, rainfed hillsides, slopes, saturated hydraulic conductivity, Chile
URN:NBN:urn:nbn:se:slu:epsilon-8-545
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-545
ID Code:4886
Department:(NL, NJ) > Dept. of Soil Sciences > Div. of Hydrotechnics
Deposited By: Elisabeth Bölenius
Deposited On:15 Jul 2010 00:00
Metadata Last Modified:02 Dec 2014 10:34

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