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Testing the soil carbon saturation theory: Maximal carbon stabilization and soil organic matter stability as a function of organic carbon inputs.
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View online- Format:
- Book
- Thesis/Dissertation
- Author/Creator:
- Feng, Wenting.
- Language:
- English
- Subjects (All):
- Environmental sciences.
- Chemistry, Organic.
- Soil science.
- Ecology.
- Biology, Ecology.
- Agriculture, Soil Science.
- Environmental Sciences.
- 0329.
- 0481.
- 0490.
- 0768.
- Penn dissertations--Earth and environmental science .
- Earth and environmental science--Penn dissertations.
- Local Subjects:
- Biology, Ecology.
- Agriculture, Soil Science.
- Chemistry, Organic.
- Environmental Sciences.
- Penn dissertations--Earth and environmental science .
- Earth and environmental science--Penn dissertations.
- 0329.
- 0481.
- 0490.
- 0768.
- Physical Description:
- 185 pages
- Contained In:
- Dissertation Abstracts International 74-03B(E).
- System Details:
- Mode of access: World Wide Web.
- text file
- Summary:
- Soil carbon (C) stocks and fluxes represent significant components of the global C cycle. Application of the soil C saturation theory can help identify soils with large C storage potentials and estimate rates and durations needed to reach maximal soil C storage. The goal of my dissertation was to test the soil C saturation theory by estimating C saturation levels of fine soil particles and quantifying changes in soil organic matter (SOM) stability as fine soil particles approach C saturation. Current model using least-squares linear regression generally underestimates C the maximal amount of soil C stabilization in fine soil particles. Using an analysis of published data, I proposed two alternative methods (boundary line analysis and the organic C loading method) to improve estimates, and found that while the organic C loading method is better since it incorporated mineral specific surface areas which would influence C saturation, it requires information about soil mineralogy and further tests to determine whether the monolayer-equivalent C loading indeed represents a maximal C stabilization potential. Laboratory batch sorption experiment of dissolved organic matter onto soil minerals generated organo-mineral complexes with a range of organic C loadings. These organo-mineral complexes, as well as silt+clay fractions physically isolated from soil samples from three long-term agroecosystem field experiments with differing fertilizer and manure addition treatments, were used to test for differences in SOM stability as a function of organic C loading. Biological, chemical, and thermal test of SOM stability showed little change or the increase trend of SOM stability with increasing organic C inputs, which do not support the notion of the soil C saturation theory that SOM stability decreases as organic C inputs increase. This observation of SOM stability is likely due to the fact that most samples did not exhibit C saturation behavior. The results show that most soils are likely well below C saturation, and further studies of the driving factors (e.g., chemical composition of organic C inputs, mineralogy, and organo-mineral binding types and strength) is needed to determine maximal C loadings and estimate the maximal soil C storage potentials.
- Notes:
- Thesis (Ph.D. in Earth and Environmental Science ) -- University of Pennsylvania, 2012.
- Source: Dissertation Abstracts International, Volume: 74-03(E), Section: B.
- Advisers: Alain F. Plante; Arthur H. Johnson.
- Local Notes:
- School code: 0175.
- ISBN:
- 9781267712738
- Access Restriction:
- Restricted for use by site license.
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