Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1002/esp.3320
Title (Primary) Biotic controls on shallow translational landslides
Author Vorpahl, P.; Dislich, C.; Elsenbeer, H.; Märker, M.; Schröder, B.
Source Titel Earth Surface Processes and Landforms
Year 2013
Department OESA
Volume 38
Issue 2
Page From 198
Page To 212
Language englisch
Keywords shallow translational landslides; tropical montane forest; biomass; organic layer
UFZ wide themes ru5
Abstract In undisturbed tropical montane rainforests massive organic layers accommodate the majority of roots and only a small fraction of roots penetrate the mineral soil. We investigated the contribution of vegetation to slope stability in such environments by modifying a standard model for slope stability to include an organic layer with distinct mechanical properties. The importance of individual model parameters was evaluated using detailed measurements of soil and vegetation properties to reproduce the observed depth of 11 shallow landslides in the Andes of southern Ecuador. By distinguishing mineral soil, organic layer and above-ground biomass, it is shown that in this environment vegetation provides a destabilizing effect mainly due to its contribution to the mass of the organic layer (up to 973 t ha− 1 under wet conditions). Sensitivity analysis shows that the destabilizing effect of the mass of soil and vegetation can only be effective on slopes steeper than 37.9°. This situation applies to 36% of the study area. Thus, on the steep slopes of this megadiverse ecosystem, the mass of the growing forest promotes landsliding, which in turn promotes a new cycle of succession. This feedback mechanism is worth consideration in further investigations of the impact of landslides on plant diversity in similar environments.
Persistent UFZ Identifier
Vorpahl, P., Dislich, C., Elsenbeer, H., Märker, M., Schröder, B. (2013):
Biotic controls on shallow translational landslides
Earth Surf. Process. Landf. 38 (2), 198 - 212 10.1002/esp.3320