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| Titel |
Soil water storage and groundwater behaviour in a catenary sequence beneath forest in central Amazonia: I. Comparisons between plateau, slope and valley floor |
| VerfasserIn |
M. G. Hodnett, I. Vendrame, A. De O. Marques Filho, M. D. Oyama, J. Tomasella |
| 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 ; 1, no. 2 ; Nr. 1, no. 2, S.265-277 |
| Datensatznummer |
250000146
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| Publikation (Nr.) |
 copernicus.org/hess-1-265-1997.pdf |
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| Zusammenfassung |
| Soil water storage was monitored in three landscape
elements in the forest (plateau, slope and valley floor) over a 3 year
period to identify differences in sub-surface hydrological response. Under
the plateau and slope, the changes of storage were very similar and there
was no indication of surface runoff on the slope. The mean maximum seasonal
storage change was 156 mm in the 2 m profile but it was clear that, in
the dry season, the forest was able to take up water from below 3.6 m.
Soil water availability was low. Soil water storage changes in the valley
were dominated by the behaviour of a shallow water table which, in normal
years, varied between 0.1 m below the surface at the end of the wet season
and 0.8 m at the end of the dry season. Soil water storage changes were
small because root uptake was largely replenished by groundwater flow towards
the stream. The groundwater behaviour is controlled mainly by the deep
drainage from beneath the plateau and slope areas. The groundwater gradient
beneath the slope indicated that recharge beneath the plateau and slope
commences only after the soil water deficits from the previous dry season
have been replenished. Following a wet season with little recharge, the
water table fell, ceasing to influence the valley soil water storage, and
the stream dried up. The plateau and slope, a zone of very high porosity
between 0.4 and 1.1 m, underlain by a less conductive layer, is a probable
route for interflow during, and for a few hours after, heavy and prolonged
rainfall. |
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