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Global environmental changes impact soil hydraulic functions through biophysical feedbacks.

David A Robinson1, Jan W Hopmans2, Vilim Filipovic3

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|March 23, 2019
PubMed
Summary

Soil moisture is crucial for life, but current models ignore biological impacts on soil structure. Including these feedbacks is vital for predicting ecosystem changes and potential irreversible shifts in soil water dynamics.

Keywords:
biophysical feedbacksenvironmental changehydraulicinfiltrationsoil physicssoil water contentstate shiftwater repellency

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Area of Science:

  • Environmental Science
  • Soil Science
  • Hydrology

Background:

  • Soil water, though scarce, is essential for terrestrial life.
  • Current soil hydrological models use static hydraulic parameters, neglecting biological influences.
  • Understanding soil moisture dynamics is critical for predicting environmental changes and impacts.

Purpose of the Study:

  • To highlight the importance of biological feedbacks in influencing soil structure and hydraulic properties.
  • To advocate for the integration of these dynamic feedbacks into soil hydrological models.
  • To explore the potential for irreversible changes in soil hydraulic function and alternative stable states.

Main Methods:

  • Conceptual argument emphasizing biological feedbacks (plants, fauna, microbiome) on soil structure.
  • Critique of existing soil hydrological models for their static parameterization.
  • Proposal for new modeling approaches incorporating dynamic soil structure and hydraulic evolution.

Main Results:

  • Biological feedbacks significantly influence soil structure, hydraulic parameters, and observed soil water content.
  • Environmental change is expected to accelerate and alter soil hydraulic function.
  • Changes driven by biological feedbacks may lead to irreversible shifts and alternative stable states in soil moisture.

Conclusions:

  • Integrating dynamic biological feedbacks into soil-plant-atmosphere models is essential for accurate ecosystem modeling.
  • Future models must account for feedbacks between soil properties and various biological and atmospheric processes.
  • This new direction is crucial for understanding and predicting ecosystem responses to climate and land-use change.