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Extramural Research

Grantee Research Project Results

Grantee Research Project Results

The Effect of Elevated Carbon Dioxide (CO2) Concentrations and Vegetation Mortality on Mineral Weathering in Soils

EPA Grant Number: U915625
Title: The Effect of Elevated Carbon Dioxide (CO2) Concentrations and Vegetation Mortality on Mineral Weathering in Soils
Investigators: Stephens, Jennie C.
Institution: California Institute of Technology
EPA Project Officer: Boddie, Georgette
Project Period: September 1, 1999 through September 1, 2002
Project Amount: $99,167
RFA: STAR Graduate Fellowships (1999)
Research Category: Academic Fellowships , Ecological Indicators/Assessment/Restoration , Fellowship - Earth Sciences



The primary objective of this research project is to determine the response of mineral weathering to both elevated soil carbon dioxide (CO2) concentrations and varying organic acid concentrations in soils from Mammoth Mountain, CA.


This research involves field sampling and analysis that compares the mineralogical and organic acid characteristics of soil samples from a high CO2 site on Mammoth Mountain to control soil samples collected from the same area that have not been exposed to elevated CO2 concentrations. This field work will be complemented with laboratory studies that assess weathering rates of soil minerals under controlled partial pressures of CO2 and varied organic acid concentrations.

Expected Results:

Research of the Mammoth Mountain high CO2 site will provide data about the response of mineral weathering in soils to high CO2 concentrations, in conjunction with changes in organic acid concentrations caused by vegetation mortality.

Supplemental Keywords:

mineral weathering, carbon dioxide, organic acids, soil chemistry, mineral dissolution, Sierra Nevada, Mammoth Mountain, soil science., RFA, Scientific Discipline, Ecosystem Protection/Environmental Exposure & Risk, Ecology, Environmental Chemistry, Monitoring/Modeling, Environmental Monitoring, Ecology and Ecosystems, monitoring, environmental measurement, vegetation, analytical chemistry, soil chemistry, ecosystem health, elevated CO2

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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