Modeling the impact of agricultural land use and management on US carbon budgets
Abstract
Cultivation of the terrestrial land surface can create either a source or sink of atmospheric CO2, depending on land management practices. The Community Land Model (CLM) provides a useful tool for exploring how land use and management impact the soil carbon pool at regional to global scales. CLM was recently updated to include representation of managed lands growing maize, soybean, and spring wheat. In this study, CLM-Crop is used to investigate the impacts of various management practices, including fertilizer use and differential rates of crop residue removal, on the soil organic carbon (SOC) storage of croplands in the continental United States over approximately a 170-year period. Results indicate that total US SOC stocks have already lost over 8 Pg C (10%) due to land cultivation practices (e.g., fertilizer application, cultivar choice, and residue removal), compared to a land surface composed of native vegetation (i.e., grasslands). After long periods of cultivation, individual subgrids (the equivalent of a field plot) growing maize and soybean lost up to 65% of the carbon stored compared to a grassland site. Crop residue management showed the greatest effect on soil carbon storage, with low and medium residue returns resulting in additional losses of 5 and 3.5%,more »
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23), Earth System Modeling; National Energy Research Scientific Computing Center (NERSC)
- OSTI Identifier:
- 1197737
- Alternate Identifier(s):
- OSTI ID: 1201739; OSTI ID: 1396278
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231
- Resource Type:
- Published Article
- Journal Name:
- Biogeosciences (Online)
- Additional Journal Information:
- Journal Name: Biogeosciences (Online) Journal Volume: 12 Journal Issue: 7; Journal ID: ISSN 1726-4189
- Publisher:
- Copernicus Publications, EGU
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Agriculture; Biogeochemistry; Soil Organic Carbon; land surface model
Citation Formats
Drewniak, B. A., Mishra, U., Song, J., Prell, J., and Kotamarthi, V. R. Modeling the impact of agricultural land use and management on US carbon budgets. Germany: N. p., 2015.
Web. doi:10.5194/bg-12-2119-2015.
Drewniak, B. A., Mishra, U., Song, J., Prell, J., & Kotamarthi, V. R. Modeling the impact of agricultural land use and management on US carbon budgets. Germany. https://doi.org/10.5194/bg-12-2119-2015
Drewniak, B. A., Mishra, U., Song, J., Prell, J., and Kotamarthi, V. R. Thu .
"Modeling the impact of agricultural land use and management on US carbon budgets". Germany. https://doi.org/10.5194/bg-12-2119-2015.
@article{osti_1197737,
title = {Modeling the impact of agricultural land use and management on US carbon budgets},
author = {Drewniak, B. A. and Mishra, U. and Song, J. and Prell, J. and Kotamarthi, V. R.},
abstractNote = {Cultivation of the terrestrial land surface can create either a source or sink of atmospheric CO2, depending on land management practices. The Community Land Model (CLM) provides a useful tool for exploring how land use and management impact the soil carbon pool at regional to global scales. CLM was recently updated to include representation of managed lands growing maize, soybean, and spring wheat. In this study, CLM-Crop is used to investigate the impacts of various management practices, including fertilizer use and differential rates of crop residue removal, on the soil organic carbon (SOC) storage of croplands in the continental United States over approximately a 170-year period. Results indicate that total US SOC stocks have already lost over 8 Pg C (10%) due to land cultivation practices (e.g., fertilizer application, cultivar choice, and residue removal), compared to a land surface composed of native vegetation (i.e., grasslands). After long periods of cultivation, individual subgrids (the equivalent of a field plot) growing maize and soybean lost up to 65% of the carbon stored compared to a grassland site. Crop residue management showed the greatest effect on soil carbon storage, with low and medium residue returns resulting in additional losses of 5 and 3.5%, respectively, in US carbon storage, while plots with high residue returns stored 2% more carbon. Nitrogenous fertilizer can alter the amount of soil carbon stocks significantly. Under current levels of crop residue return, not applying fertilizer resulted in a 5% loss of soil carbon. Our simulations indicate that disturbance through cultivation will always result in a loss of soil carbon, and management practices will have a large influence on the magnitude of SOC loss.},
doi = {10.5194/bg-12-2119-2015},
journal = {Biogeosciences (Online)},
number = 7,
volume = 12,
place = {Germany},
year = {Thu Apr 09 00:00:00 EDT 2015},
month = {Thu Apr 09 00:00:00 EDT 2015}
}
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https://doi.org/10.5194/bg-12-2119-2015
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