|Phase II (2019-'21)|
II P1: FIRE Induced Element Cycling
II P6: Bio-Geomorphology
II P7: Biota, fracture, thresholds
II P11: DeepES - Weathering Geochemistry
II P13: DeepES - Geophysical Imaging
II P14: DeepES - Microbial activity
II P15: DeepES - Geomicrobiology
II A2: Bioweath
|Phase I (2016-'18)|
I P2: Coupled Modelling
I P3: Biofilms & Weathering
I P5: Crustweathering
I P6: Root Carbon
I P7: Paleoclimate
I P9: Sediment Transport
I P10: Phosphorus solubilization
I P11: Green & Grey world
I P12: Biogenic Weathering
I A3: Carbon & Nutrient Fluxes
Investigator Names and Contact Info:
Chilean Collaborators Involved:
66% Co-Supervisor: PD Dr. Thomas Hoffmann, 33% Co-supervisor: Prof. Lothar Schrott
supervisor: PD Dr. Thomas Hoffmann / Prof. Lothar Schrott, co-supervisor: Dr. Sebastian Schmidtlein
supervisor: Dr. Sebastian Schmidtlein
BioScapes IV is part of a series of independent EARTHSHAPE proposals that quantifies biotic, surface process, and paleoclimate interactions at the catchment scale and larger. In This contribution, we analyse the evolution of the earth surface, which is governed by i) physical and chemical weathering, ii) hillslope and channel erosion, and iii) transport and deposition of sediment. Biota, and most prominent vegetation, plays a crucial role in all three processes. Depending on the timescale, biota can increase or decrease the rates of earth surface processes. In the context of plants as ecosystem engineers, sediment deposition is of special importance since it generates high productivity habitats and thus facilitates the establishment of new vegetation, which in turn modifies earth surface processes. Understanding the response of the earth surface to environmental changes at various time scales thus requires a detailed knowledge on the interaction between earth surface processes and vegetation dynamics.
This project aims at understanding temporal and spatial effects of vegetation and other biotic processes on sediment dynamics in the three focus catchments of EarthShape. Along the flow path of water, sediment delivery and storage will be assessed on different spatiotemporal scales including individual hillslopes and entire river catchments, from ~20 ka BP to the present.
The study combines data from geomorphological and stratigraphical mapping, geophysical soundings and OSL and radiocarbon dating. This information will be used to compile a long-term sediment storage inventory and to calculate sediment budgets and residence times, as a proxy of sediment connectivity. To differentiate the direct (short-term) effects of the vegetation patterns on recent sediment storage and connectivity from long-term topographic effects of vegetation mediated weathering and transport, we will use a straightforward connectivity algorithm and evaluate the results based on the geomorphic mapping and the results of the long-term sediment budget.
In summary, the proposed project will deepen our understanding of non-linear responses to external drivers in ecogeomorphological systems through a combination of geomorphological and biogeographical techniques. The major focus lies on sediment storage and residence time, which are central measures of catchment connectivity and thus of the sensitivity of sediment cascades in response to external environmental changes.