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| Titel |
Spatial variations of shallow and deep soil moisture in the semi-arid Loess Plateau, China |
| VerfasserIn |
L. Yang, W. Wei, L. Chen, F. Jia, B. Mo |
| 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 ; 16, no. 9 ; Nr. 16, no. 9 (2012-09-10), S.3199-3217 |
| Datensatznummer |
250013463
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| Publikation (Nr.) |
 copernicus.org/hess-16-3199-2012.pdf |
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| Zusammenfassung |
| Soil moisture in deep soil layers is an important relatively
stable water resource for vegetation growth in the semi-arid Loess Plateau
of China. Characterizing the spatial variations of deep soil moisture with
respect to the topographic conditions has significant importance for
vegetation restoration. In this study, we focused on analyzing the spatial
variations and factors influencing soil moisture content (SMC) in shallow
(0–2 m) and deep (2–8 m) soil layers, based on soil moisture observations
in the Longtan watershed, Dingxi, Gansu province. The vegetation type of
each sampling site for each comparison is same and varies by different
positions, gradients, or aspects. The following discoveries were captured:
(1) in comparison with shallow SMC, slope position and slope aspect may
affect shallow soil moisture more than deep layers, while slope gradient
affects both shallow and deep soil moisture significantly. This indicates
that a great difference in deep soil hydrological processes between shallow
and deep soil moisture remains that can be attributed to the introduced
vegetation and topography. (2) A clear negative relationship exists between
vegetation growth condition and deep soil moisture, which indicates that
plants under different growing conditions may differ in consuming soil
moisture, thus causing higher spatial variations in deep soil moisture. (3)
The dynamic role of slope position and slope aspect on deep soil moisture
has been changed due to large-scale plantation in semi-arid environment.
Consequently, vegetation growth conditions and slope gradients may become
the key factors dominating the spatial variations in deep soil
moisture. |
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