Biogeochemistry

, Volume 102, Issue 1–3, pp 15–29 | Cite as

An open system framework for integrating critical zone structure and function

  • Craig Rasmussen
  • Peter A. Troch
  • Jon Chorover
  • Paul Brooks
  • Jon Pelletier
  • Travis E. Huxman
Synthesis & Emerging Ideas

Abstract

The “critical zone” includes the coupled earth surface systems of vegetation, regolith and groundwater that are essential to sustaining life on the planet. The function of this zone is the result of complex interactions among physical, chemical and biological processes and understanding these interactions remains a major challenge to earth system sciences. Here we develop an integrated framework based on thermodynamic theory to characterize the critical zone as a system open to energy and mass fluxes that are forced by radiant, geochemical, and elevational gradients. We derive a statement that demonstrates the relative importance of solar radiation, water, carbon, and physical/chemical denudation mass fluxes to the critical zone energy balance. Within this framework we use rates of effective energy and mass transfer [EEMT; W m−2] to quantify the relevant flux-gradient relations. Synthesis of existing data demonstrates that variation in energetics associated with primary production and effective precipitation explains substantial variance in critical zone structure and function. Furthermore, we observe threshold behavior in systems that transition to primary production predominance of the energy flux term. The proposed framework provides a first order approximation of non-linearity in critical zone processes that may be coupled with physical and numerical models to constrain landscape evolution.

Keywords

Critical zone Open system thermodynamics Energy and matter transfer Pedogenesis Biogeochemistry Landscape evolution Ecohydrology Hydrologic partitioning 

Supplementary material

10533_2010_9476_MOESM1_ESM.pdf (522 kb)
Supplementary material (PDF 522 kb)

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Craig Rasmussen
    • 1
  • Peter A. Troch
    • 2
  • Jon Chorover
    • 1
  • Paul Brooks
    • 2
  • Jon Pelletier
    • 3
  • Travis E. Huxman
    • 4
    • 5
  1. 1.Deparment of Soil, Water and Environmental ScienceThe University of ArizonaTucsonUSA
  2. 2.Department of Hydrology and Water ResourcesThe University of ArizonaTucsonUSA
  3. 3.Department of GeosciencesThe University of ArizonaTucsonUSA
  4. 4.Department of Ecology and Evolutionary BiologyThe University of ArizonaTucsonUSA
  5. 5.B2 EarthscienceThe University of ArizonaTucsonUSA

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