Marjorie S Schulz

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  December 4, 2018

  Biogeochemistry of the Critical Zone: Origin and Fate of Organic Matter

  Changing temperature, precipitation, and land use intensification has resulted in global soil degradation. The accompanying loss of soil organic matter (SOM) decreases important soil health services. Soil organic matter is a major global pool of carbon; if SOM can be increased, soils can mitigate elevated atmospheric CO2. However, there are major knowledge gaps in SOM persistence. This project...

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  Climate Research and Development Program, Earth Systems Biogeochemistry Laboratory

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  December 4, 2018

  Biogeochemistry of the Critical Zone: Origin and Fate of Organic Matter

  Changing temperature, precipitation, and land use intensification has resulted in global soil degradation. The accompanying loss of soil organic matter (SOM) decreases important soil health services. Soil organic matter is a major global pool of carbon; if SOM can be increased, soils can mitigate elevated atmospheric CO2. However, there are major knowledge gaps in SOM persistence. This project...

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  September 27, 2022

  The influence of soil development on the depth distribution and structure of soil microbial communities.

  Although it has been shown that the interaction of climate and time shape the dynamics of soil organic matter (SOM) storage and preservation in soil, the role of soil microbial communities in this dynamic remains unclear. Microbial communities are present throughout soil profiles and likely play critical roles in SOM and nutrient cycling, however the influence of other factors such as soil develop

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  Mary-Catherine Leewis, Corey Lawrence, Marjorie S. Schulz, Malak M. Tfaily, Christian Orlando Ayala-Ortiz, Gilberto E. Flores, Rachel Mackelprang, Jack McFarland

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  Climate Research and Development Program, Geosciences and Environmental Change Science Center

  June 28, 2022

  Biofilms in the Critical Zone: Distribution and mediation of processes

  Microbial biofilms occur in all levels of the Critical Zone (CZ); they are on and in the vegetation, throughout the soil-saprolite zone, and along fractures in deep subsurface. Here we discuss biofilms in each level of the CZ with a focus in the soil-saprolite continuum. We show how scanning electron microscope (SEM) images provide an appropriate scale to explore microbe mineral interactions in th

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  Marjorie S. Schulz, Kristen L. Manies

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  Climate Research and Development Program, Geology, Minerals, Energy, and Geophysics Science Center

  March 12, 2022

  Mechanisms for retention of low molecular weight organic carbon varies with soil depth at a coastal prairie ecosystem

  Though primary sources of carbon (C) to soil are plant inputs (e.g., rhizodeposits), the role of microorganisms as mediators of soil organic carbon (SOC) retention is increasingly recognized. Yet, insufficient knowledge of sub-soil processes complicates attempts to describe microbial-driven C cycling at depth as most studies of microbial-mineral-C interactions focus on surface horizons. We leverag

  Authors

  Jack McFarland, Corey Lawrence, Courtney Creamer, Marjorie S. Schulz, Christopher H. Conaway, Sara Peek, Mark Waldrop, Sabrina N. Sevilgen, Monica Haw

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  Volcano Hazards Program, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, Volcano Science Center

  August 13, 2021

  The trajectory of soil development and its relationship to soil carbon dynamics

  It has been postulated that the amount of soil organic carbon (SOC) associated with soil minerals exhibits a threshold relationship in response to effective soil moisture (estimated as precipitation less evapotranspiration). To better characterize the role of moisture in influencing mechanisms of SOC storage during pedogenesis, we compare soils from two different chronosequence sites: the Santa Cr

  Authors

  Corey Lawrence, Marjorie S. Schulz, Caroline Masiello, Oliver A. Chadwick, Jennifer W. Harden

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  Volcano Hazards Program, Volcano Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center

  March 4, 2021

  Response to ‘Stochastic and deterministic interpretation of pool models’

  We concur with Azizi‐Rad et al. (2021) that it is vital to critically evaluate and compare different soil carbon models, and we welcome the opportunity to further describe the unique contribution of the PROMISE model (Waring et al. 2020) to this literature. The PROMISE framework does share many features with established biogeochemical models, as our original manuscript highlighted in Table 1, and

  Authors

  Bonnie G. Waring, Benjamin N. Sulman, Sasha C. Reed, A. Peyton Smith, Colin Averill, Courtney Creamer, Daniela F. Cusack, Steven J. Hall, Julie D. Jastrow, Andrea Jilling, Kenneth M. Kemner, Markus Kleber, Xiao-Jun Allen Liu, Jennifer Pett-Ridge, Marjorie S. Schulz

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  Ecosystems Mission Area, Climate Research and Development Program, Land Change Science Program, Southwest Biological Science Center

  October 16, 2020

  From pools to flow: The PROMISE framework for new insights on soil carbon cycling in a changing world

  Soils represent the largest terrestrial reservoir of organic carbon, and the balance between soil organic carbon (SOC) formation and loss will drive powerful carbon‐climate feedbacks over the coming century. To date, efforts to predict SOC dynamics have rested on pool‐based models, which assume classes of SOC with internally homogenous physicochemical properties. However, emerging evidence suggest

  Authors

  Bonnie G. Waring, Benjamin N. Sulman, Sasha C. Reed, A. Peyton Smith, Colin Averill, Courtney Creamer, Daniela F. Cusack, Steven J. Hall, Julie Jastrow, Kenneth M. Kemner, Markus Kleber, Xiao-Jun Allen Liu, Jennifer Pett-Ridge, Marjorie S. Schulz

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  Ecosystems Mission Area, Climate Research and Development Program, Land Change Science Program, Southwest Biological Science Center

  July 23, 2019

  Root-driven weathering impacts on mineral-organic associations in deep soils over pedogenic time scales

  Plant roots are critical weathering agents in deep soils, yet the impact of resulting mineral transformations on the vast deep soil carbon (C) reservoir are largely unknown. Root-driven weathering of primary minerals may cause the formation of reactive secondary minerals, which protect mineral-organic associations (MOAs) for centuries or millennia. Conversely, root-driven weathering may also trans

  Authors

  Mariela Garcia Arredondo, Corey Lawrence, Marjorie S. Schulz, Malak M. Tfaily, Ravi K. Kukkadapu, Morris E. Jones, Kristin Boye, Marco Keiluweit

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  Water Resources Mission Area, Climate Research and Development Program, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center

  July 8, 2019

  Mineralogy dictates the initial mechanism of microbial necromass association

  Soil organic matter (SOM) improves soil fertility and mitigates disturbance related to climate and land use change. Microbial necromass (the accumulated cellular residues of microorganisms) comprises the majority of soil C, yet the formation and persistence of necromass in relation to mineralogy is poorly understood. We tested whether soil minerals had different microbial necromass association mec

  Authors

  Courtney Creamer, Andrea L. Foster, Corey Lawrence, Jack McFarland, Marjorie S. Schulz, Mark Waldrop

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  Climate Research and Development Program, Geology, Minerals, Energy, and Geophysics Science Center

  July 24, 2018

  Geochemistry and microbiology of groundwater and solids from extraction and monitoring wells and their relation to well efficiency at a Federally operated confined disposal facility, East Chicago, Indiana

  In cooperation with the U.S. Army Corps of Engineers, Chicago District, the U.S. Geological Survey investigated the processes affecting water quality, geochemistry, and microbiology in representative extraction and monitoring wells at a confined disposal facility (CDF) in East Chicago, Indiana. The CDF is a 140-acre Federally-managed facility that was the former location of an oil refinery and is

  Authors

  Randall E. Bayless, Travis R. Cole, David C. Lampe, Rebecca E. Travis, Marjorie S. Schulz, Paul M. Buszka

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  Ohio-Kentucky-Indiana Water Science Center

  March 8, 2018

  Landscapes from the waves—Marine terraces of California

  Many coastlines around the world have stair-step landforms, known as marine terraces. Marine terraces make up a large part of coastal California’s landscape—from San Diego to Crescent City. Find out how these landscapes form, why marine terraces are of interest to scientists, and where you can explore these landscapes.

  Authors

  Marjorie S. Schulz, Corey Lawrence, Daniel R. Muhs, Carol S. Prentice, Sam Flanagan

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  Water Resources Mission Area

  February 15, 2017

  Lithological influences on contemporary and long-term regolith weathering at the Luquillo Critical Zone Observatory

  Lithologic differences give rise to the differential weatherability of the Earth’s surface and globally variable silicate weathering fluxes, which provide an important negative feedback on climate over geologic timescales. To isolate the influence of lithology on weathering rates and mechanisms, we compare two nearby catchments in the Luquillo Critical Zone Observatory in Puerto Rico, which have s

  Authors

  Heather L. Buss, Maria Chapela Lara, Oliver Moore, Andrew C. Kurtz, Marjorie S. Schulz, Arthur F. White

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  Water Resources Mission Area, Climate Research and Development Program, Land Change Science Program

  January 10, 2017

  Long-term flow-through column experiments and their relevance to natural granitoid weathering rates

  Four pairs of fresh and partly-weathered granitoids, obtained from well-characterized watersheds—Merced River, CA, USA; Panola, GA, USA; Loch Vale, CO, USA, and Rio Icacos, Puerto Rico—were reacted in columns under ambient laboratory conditions for 13.8 yrs, the longest running experimental weathering study to date. Low total column mass losses (<1 wt. %), correlated with the absence of pitting or

  Authors

  Arthur F. White, Marjorie S. Schulz, Corey R. Lawrence, Davison V. Vivit, David A. Stonestrom

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  Water Resources Mission Area, Climate Research and Development Program, Land Change Science Program