Session: Soils through Time: Critical Zone Studies of Processes and Their Effects

56 J20. Soils through Time: Critical Zone Studies of Processes and Their Effects
(GSA Quaternary Geology and Geomorphology Division; Geochemical Society; S05 Pedology)

Monday, 6 October 2008: 8:00 AM

George R. Brown Convention Center, General Assembly Theater Hall B

Presiding:

Marjorie S. Schulz , David Stonestrom and Daniel D. Richter Jr

8:00 AM

Rock to Regolith Conversion: Producing "User-Friendly" Material for Terrestrial Ecosystems
Robert C. Graham

8:15 AM

Distinguishing Between Biogenic and Lithogenic Processes Controlling Mineral Nutrients In Soils
Art White, U. S. Geological Survey; Marjorie Schulz, US Geological Survey; Davison Vivit, U.S. Geological Survey

8:30 AM

The Importance of Chemical Equilibrium in Controlling Chemical Weathering Rates: Insights from Reactive Transport Modeling of Soil Chronosequences
Kate Maher, Stanford University; Carl Steefel, Lawrence Berkeley National Laboratory; Art White, U. S. Geological Survey; David Stonestrom, US Geological Survey

8:45 AM

Response of Root Depth to Climate - a Hydrologist's View of the Critical Zone
Andrew J. Guswa, Smith College

9:00 AM

Rhizogenic Fe Redox Cycling: A Biogeochemical Process Linking Uplands and Wetlands
Ryan L. Fimmen, Battelle - Environmental Restoration; Daniel deB. Richter, Duke University

9:15 AM

Iron Mass Balance in a Chronosequence of Upland Soils: Surficial Accumulation Due to Biological Lifting of Mineral Iron
Marjorie S. Schulz, US Geological Survey; Art F. White, US Geological Survey; John Fitzpatrick, US Geological Survey; Tom Bullen, US Geological Survey

9:30 AM

The Imprint of Soil Biota Over Annual to Millennial Timescales
Marshall Wilkinson, University of Kentucky; Tim Pietsch, CSIRO

9:45 AM

Break

10:00 AM

Controls on ⁸⁷Sr/⁸⁶Sr of Plant- Available Ions and Soil Minerals across the Hawaiian Archipelago
Oliver A. Chadwick, Univ California - Santa Barbara; Louis A. Derry, Cornell University

10:15 AM

Quantitative Feedback Between the Rates of Soil Chemical Weathering and Colluvial Sediment Transport along a Hillslope Transect
Kyungsoo Yoo, University of Delaware; Simon, Marius Mudd, University of Edinburgh; Jonathan Sanderman, UC Santa Cruz; Ronald Amundson, U.C. Berkeley; Alex Blum, USGS

10:30 AM

Sedimentological, geochemical, and biological aspects of bisequal spodosols formed on Trail Ridge, south Georgia, USA
Donald M. Thieme, Valdosta State University

10:45 AM

Opposing Effects of Rainfall and Aerosol Washout on Soil Silicon Isotope Ratios
Carleton R. Bern, UC Santa Barbara; Mark Brzezinski, UC Santa Barbara; Charlotte Beucher, UC Santa Barbara; Oliver A. Chadwick, Univ California - Santa Barbara

11:00 AM

Organic Matter Composition and Soil Mineral Interactions across a Substrate Age Gradient in Hawai'i
Marc Gerald Kramer, UC Santa Cruz; Oliver Chadwick, Univ of California

11:15 AM

Using Rare Earth Element Signatures to Probe Cumulative Effects of Short-Term Biogeochemical Processes Over Long (0.3 – 4100 ky) Time Scales
Aaron Thompson, Univeristy of Georgia; Richard R.R. Rushforth, University of Arizona; Oliver Chadwick, Univ of California; Jon Chorover, University of Arizona

11:30 AM

Albite Dissolution Kinetics Under near-Equilbrium Conditions
Alexis Offner, Rice University; Rolf S. Arvidson, Rice Univ; Andreas Luttge, Rice Univ

11:45 AM

The Relationship Between Reactivity and Topography of Crystal Surfaces
Cornelius Fischer, Rice University; Rolf S. Arvidson, Rice Univ; Li Zhang, University of Southern California; Andreas Luttge, Rice Univ

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