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| Titel |
Desert shrub stemflow and its significance in soil moisture replenishment |
| VerfasserIn |
X.-P. Wang, Z.-N. Wang, R. Berndtsson, Y.-F. Zhang, Y.-X. Pan |
| 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 ; 15, no. 2 ; Nr. 15, no. 2 (2011-02-11), S.561-567 |
| Datensatznummer |
250012644
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| Publikation (Nr.) |
 copernicus.org/hess-15-561-2011.pdf |
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| Zusammenfassung |
| Stemflow of xerophytic shrubs represents a significant
component of water replenishment to the soil-root system influencing water
utilization of plant roots at the stand scale, especially in water scarce
desert ecosystems. In this study, stemflow of Caragana korshinskii was quantified by an aluminum
foil collar collection method on re-vegetated sand dunes of the Shapotou
restored desert ecosystem in northwestern China. Time domain reflectometry
probes were inserted horizontally at 20 different soil profile depths under
the C. korshinskii shrub to monitor soil moisture variation at hourly intervals. Results
indicated that 2.2 mm precipitation was necessary for the generation of
stemflow for C. korshinskii. Stemflow averaged 8% of the gross precipitation and the
average funnelling ratio was as high as 90. The soil moisture in the
uppermost soil profile was strongly correlated with individual rainfall and
the stemflow strengthened this relationship. Therefore, it is favourable for
the infiltrated water redistribution in the deeper soil profile of the root
zone. Consequently, stemflow contributes significantly to a positive soil
moisture balance in the root zone and the replenishment of soil moisture at
deeper soil layers. This plays an important role in plant survival and the
general ecology of arid desert environments. |
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