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| Titel |
Analysis of soil water dynamics in an agroforestry system based on detailed soil water records from time-domain reflectometry |
| VerfasserIn |
N. A. Jackson, J. C. Wallace |
| 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 ; 3, no. 4 ; Nr. 3, no. 4, S.517-527 |
| Datensatznummer |
250001188
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| Publikation (Nr.) |
 copernicus.org/hess-3-517-1999.pdf |
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| Zusammenfassung |
Time domain reflectometry [TDR] was used to investigate the
spatial and temporal variation in surface soil water dynamics under a number of
types of vegetation, including both trees and crops grown in isolation, and
grown together as an agroforestry system. The installation and operation of this
technique are presented, and discussed in terms of its suitability to monitor
rapid fluctuations in soil-water content in a spatially heterogeneous system
such as that described in this experiment.
The relatively small sampling volume of each
of the TDR waveguides permitted discrete measurements to be made of soil water
content (θv). In the tree-only and tree+crop treatments, this revealed
considerable variation in θv resulting from spatial redistribution of rainfall
under the tree canopies, with a significant input to soil close to the base of
the trees being made by stemflow, i.e. water intercepted by the tree canopy and
channelled down the stem.
Over the experimental period (one rainy
season) the TDR data suggested that net recharge to the soil profile in the sole
crop system was 53 mm, almost 75% more than occurred in either of the two
treatments containing trees, reflecting greater rainfall interception by the
tree canopies. |
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