EGU2020-10817
https://doi.org/10.5194/egusphere-egu2020-10817
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Soil erosion controlled by biota along a climate gradient in Chile

Nicolás Riveras1, Kristina Witzgall2, Victoria Rodríguez3, Peter Kühn1, Carsten W. Mueller2, Rómulo Oses4, Oscar Seguel5, Steffen Seitz1, Yasna Tapia5, Osvaldo Salazar5, Dirk Wagner2,6, and Thomas Scholten1
Nicolás Riveras et al.
  • 1University of Tübingen, Department of Geosciences, Soil Science and Geomorphology, Rümelinstr. 19–23, D-72070 Tübingen, Germany (nicolas-andres.riveras-munoz@uni-tuebingen.de)
  • 2Technical University of Munich, Chair of Soil Science, Emil-Ramann-Str. 2, D-85354 Freising, Germany
  • 3GFZ German Research Centre for Geosciences, Section 5.3 Geomicrobiology, Telegrafenberg, D-14473 Potsdam, Germany
  • 4Universidad de Atacama, Centro Regional de Investigación y Desarrollo Sustentable de Atacama (CRIDESAT), Copayapu 485, Copiapó, Chile
  • 5Universidad de Chile, Facultad de Ciencias Agronómicas, Av. Santa Rosa #11315, La Pintana, 8820808 Santiago, Chile
  • 6University of Potsdam, Institute of Geosciences, Karl-Liebknecht-Str. 24-25, D-14476 Potsdam, Germany

Soil erosion is one of the main problems in soil degradation nowadays and is widely distributed in many landscapes worldwide. Particularly water erosion is widespread and determined by rain erosivity, soil erodibility, topographic factors and the management carried out to mitigate this phenomenon. Although this process is mostly known as a consequence of human management such as agriculture or forestry, it is a process that also occurs naturally, being one of the factors that regulate the shape of the landscape.

One of the main agents that stabilize the soil surface is biota and its activity, either in the form of plants, microorganisms or as an assemblage in the form of a biological soil crust (biocrusts). However, there are limited studies about how and what extent biota drives soil-stabilizing processes. With particular view on the impact of biocrusts on soil erosion, most studies have been carried out in arid and semi-arid regions, so its influence under other climates is largely unknown.

This study focuses on the influence of biota on soil erosion in a temperature and rainfall gradient, covering four climate zones (arid, semi-arid, mediterranean and humid) with very limited human intervention. Other variables such as the origin of the geological formation, geographical longitude and glacial influence were kept constant for all study sites. The effect of vegetation (biocrusts) and its abundance, microbiology and terrain parameters are investigated using rainfall simulation experiments under controlled conditions and by a physico-chemical evaluation of the soil, surface runoff, percolation and sediment discharge, in order to determine the different environmental filtering effects that the soil develops under different climatic conditions.

It is expected that as vegetation vigor and cover increase, soil erodibility will decrease. The biocrust is the protagonist of this stabilization in conditions of low pedological development and will become secondary as edaphoclimatic conditions favor the colonization of plants.

The results of this study will help to achieve a better understanding of the role of biota in soil erosion control and will clarify its influence on soil losses under different climate and slope conditions. Analyses are currently ongoing and first results of our work will be presented at the EGU 2020.

How to cite: Riveras, N., Witzgall, K., Rodríguez, V., Kühn, P., Mueller, C. W., Oses, R., Seguel, O., Seitz, S., Tapia, Y., Salazar, O., Wagner, D., and Scholten, T.: Soil erosion controlled by biota along a climate gradient in Chile, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10817, https://doi.org/10.5194/egusphere-egu2020-10817, 2020

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Display material version 1 – uploaded on 07 May 2020
  • CC1: Comment on EGU2020-10817, Todd A. Ehlers, 08 May 2020

    Nice movie / presentation style.  I look forward to seeing the results when you can finish data collection. 

    • AC1: Reply to CC1, Nicolás Riveras Muñoz, 08 May 2020

      Thank you very much Prof. Ehlers! I look forward to it too, we found some interesting things on my perspective