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| Titel |
Three-dimensional monitoring of soil water content in a maize field using Electrical Resistivity Tomography |
| VerfasserIn |
L. Beff, T. Günther, B. Vandoorne, V. Couvreur, M. Javaux |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 2 ; Nr. 17, no. 2 (2013-02-11), S.595-609 |
| Datensatznummer |
250017711
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| Publikation (Nr.) |
 copernicus.org/hess-17-595-2013.pdf |
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| Zusammenfassung |
| A good understanding of the soil water content (SWC) distribution at the
field scale is essential to improve the management of water, soil and crops.
Recent studies proved that Electrical Resistivity Tomography (ERT) opens
interesting perspectives in the determination of the SWC distribution in 3
dimensions (3-D). This study was conducted (i) to check and validate how ERT
is able to monitor SWC distribution in a maize field during the late growing
season; and (ii) to investigate how maize plants and rainfall affect the
dynamics of SWC distribution. Time Domain Reflectometry (TDR) measurements
were used to validate ERT-inverted SWC values. Evolution of water mass
balance was also calculated to check whether ERT was capable of giving a
reliable estimate of soil water stock evolution. It is observed that ERT was
able to give the same average SWC as TDR (R2 = 0.98). In addition, ERT
gives better estimates of the water stock than TDR thanks to its higher spatial
resolution. The high resolution of ERT measurements also allows for the
discrimination of SWC heterogeneities. The SWC distribution showed that
alternation of maize rows and inter-rows was the main influencing factor of
the SWC distribution. The drying patterns were linked to the root profiles,
with drier zones under the maize rows. During short periods, with negligible
rainfall, the SWC decrease took place mainly in the two upper soil horizons
and in the inter-row area. In contrast, rainfall increased the SWC mostly
under the maize rows and in the upper soil layer. Nevertheless, the total
amount of rainfall during the growing season was not sufficient to modify
the SWC patterns induced by the maize rows. During the experimental time,
there was hardly any SWC redistribution from maize rows to inter-rows. Yet,
lateral redistribution from inter-rows to maize rows induced by potential
gradient generates SWC decrease in the inter-row area and in the deeper soil
horizons. |
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