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| Titel |
Spatial distribution of soil properties on a landslide in Taiwan: effects of
movement types and vegetation |
| VerfasserIn |
Pei-Chen Lee, Chih-Hsin Cheng |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250138188
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| Publikation (Nr.) |
 EGU/EGU2017-1130.pdf |
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| Zusammenfassung |
| Landslides are critical natural disturbances in tropical and temperate areas and exert immense
impacts on forest ecosystems and soil properties. The impacts of landslides on soil properties
not only vary with their movement type, scale, or location but also have great spatial variation
inside landslide. In this study, the effects of movement type (erosion and deposition) and
succeeding vegetation on soil properties inside a landslide scar were evaluated. The study site
was located in Chiufenernshan, central Taiwan. The landslide was triggered by the
Chi-Chi Earthquake (Ritch magnitude 7.3) in 1999. A huge amount of waste debris
(30 million m3) was moved along the sliding slope (with a tipping degree at 26o)
and deposited in the lower parts. Total area size of landslide scar was 200 ha and
about 30 - 50 m depth waste material was eroded/deposited in the upper/lower
scar areas. After 17 years, the succeeding vegetation varied inside landslide scar.
The erosion areas were covered with grass (Miscanthus floridulus) or left barren
in some slopes. In contrast, a secondary forest, dominated with Trema orientalis,
Lithocarpus konishii, Mallotus paniculatus, and Smilax bracteata, developed in the
deposition areas. We collected soil samples in different landscape areas including
(i) erosion areas without vegetation, (ii) erosion areas with grass vegetation, (iii)
deposition areas, and (iv) adjacent undisturbed areas. Our results indicated that the
erosion areas had higher bulk density, rock fragment and pH value, but less soil
organic carbon, total nitrogen, total phosphorus and N-mineralization rate than both
deposition and adjacent undisturbed areas. The soil properties without vegetation even
showed the extreme end compared to the soils with grass vegetation. Soils at the
deposition zone had similar rock fragment, bulk density, soil pH, soil organic carbon and
N-mineralization rate values to the undisturbed site (p > 0.05). We speculate that
movement types could determine the initial establishment of vegetation types and then
influence soil properties under vegetation succession. Therefore, both waste movement
types and vegetation and their interactions play important roles on soil properties. |
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