Late Holocene Landscape Collapse of a Trans-Himalayan Dryland: Human Impact and Aridification - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2019

Late Holocene Landscape Collapse of a Trans-Himalayan Dryland: Human Impact and Aridification

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Johanna Menges
Niels Hovius
  • Function : Author
Christoff Andermann
Michael Dietze
Charlie Swoboda
  • Function : Author
Kristen L. Cook
  • Function : Author
Basanta R. Adhikari
  • Function : Author
Andrea Vieth-Hillebrand
  • Function : Author
Tony Reimann
  • Function : Author
Andreas Koutsodendris
  • Function : Author
Dirk Sachse
  • Function : Author

Abstract

Soil degradation is a severe and growing threat to ecosystem services globally. Soil loss is often nonlinear, involving a rapid deterioration from a stable eco-geomorphic state once a tipping point is reached. Soil loss thresholds have been studied at plot scale, but for landscapes, quantitative constraints on the necessary and sufficient conditions for tipping points are rare. Here, we document a landscape-wide eco-geomorphic tipping point at the edge of the Tibetan Plateau and quantify its drivers and erosional consequences. We show that in the upper Kali Gandaki valley, Nepal, soil formation prevailed under wetter conditions during much of the Holocene. Our data suggest that after a period of human pressure and declining vegetation cover, a 20% reduction of relative humidity and precipitation below 200 mm/year halted soil formation after 1.6 ka and promoted widespread gullying and rapid soil loss, with irreversible consequences for ecosystem services.
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Dates and versions

insu-03661409 , version 1 (07-05-2022)

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Attribution - CC BY 4.0

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Johanna Menges, Niels Hovius, Christoff Andermann, Michael Dietze, Charlie Swoboda, et al.. Late Holocene Landscape Collapse of a Trans-Himalayan Dryland: Human Impact and Aridification. Geophysical Research Letters, 2019, 46, pp.13,814-13,824. ⟨10.1029/2019GL084192⟩. ⟨insu-03661409⟩
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