Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2
Increasing global atmospheric carbon dioxide (CO2) concentration has led to concerns regarding its potential effects on terrestrial ecosystems and the long-term storage of carbon (C) and nitrogen (N) in soil. This study examined responses to elevated CO2 in a grass ecosystem invaded with a leguminou...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Agronomy |
| Online Access: | http://dx.doi.org/10.1155/2012/817343 |
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| author | H. A. Torbert H. W. Polley H. B. Johnson |
| author_facet | H. A. Torbert H. W. Polley H. B. Johnson |
| author_sort | H. A. Torbert |
| collection | DOAJ |
| description | Increasing global atmospheric carbon dioxide (CO2) concentration has led to concerns regarding its potential effects on terrestrial ecosystems and the long-term storage of carbon (C) and nitrogen (N) in soil. This study examined responses to elevated CO2 in a grass ecosystem invaded with a leguminous shrub Acacia farnesiana (L.) Willd (Huisache). Seedlings of Acacia along with grass species were grown for 13 months at CO2 concentrations of 385 (ambient), 690, and 980 μmol mol−1. Elevated CO2 increased both C and N inputs from plant growth which would result in higher soil C from litter fall, root turnover, and excretions. Results from the incubation indicated an initial (20 days) decrease in N mineralization which resulted in no change in C mineralization. However, after 40 and 60 days, an increase in both C and N mineralization was observed. These increases would indicate that increases in soil C storage may not occur in grass ecosystems that are invaded with Acacia over the long term. |
| format | Article |
| id | doaj-art-64aa6777bc254ed691c535ba71b3d8a7 |
| institution | Kabale University |
| issn | 1687-8159 1687-8167 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Agronomy |
| spelling | doaj-art-64aa6777bc254ed691c535ba71b3d8a72025-08-20T03:34:25ZengWileyInternational Journal of Agronomy1687-81591687-81672012-01-01201210.1155/2012/817343817343Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2H. A. Torbert0H. W. Polley1H. B. Johnson2National Soil Dynamics Laboratory, USDA Agricultural Research Service, 411 S. Donahue, Auburn, AL 36832, USAGrassland Soil and Water Research Laboratory, USDA Agricultural Research Service, 808 E Blackland Road, Temple, TX 76502, USAGrassland Soil and Water Research Laboratory, USDA Agricultural Research Service, 808 E Blackland Road, Temple, TX 76502, USAIncreasing global atmospheric carbon dioxide (CO2) concentration has led to concerns regarding its potential effects on terrestrial ecosystems and the long-term storage of carbon (C) and nitrogen (N) in soil. This study examined responses to elevated CO2 in a grass ecosystem invaded with a leguminous shrub Acacia farnesiana (L.) Willd (Huisache). Seedlings of Acacia along with grass species were grown for 13 months at CO2 concentrations of 385 (ambient), 690, and 980 μmol mol−1. Elevated CO2 increased both C and N inputs from plant growth which would result in higher soil C from litter fall, root turnover, and excretions. Results from the incubation indicated an initial (20 days) decrease in N mineralization which resulted in no change in C mineralization. However, after 40 and 60 days, an increase in both C and N mineralization was observed. These increases would indicate that increases in soil C storage may not occur in grass ecosystems that are invaded with Acacia over the long term.http://dx.doi.org/10.1155/2012/817343 |
| spellingShingle | H. A. Torbert H. W. Polley H. B. Johnson Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2 International Journal of Agronomy |
| title | Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2 |
| title_full | Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2 |
| title_fullStr | Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2 |
| title_full_unstemmed | Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2 |
| title_short | Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO2 |
| title_sort | nitrogen and carbon cycling in a grassland community ecosystem as affected by elevated atmospheric co2 |
| url | http://dx.doi.org/10.1155/2012/817343 |
| work_keys_str_mv | AT hatorbert nitrogenandcarboncyclinginagrasslandcommunityecosystemasaffectedbyelevatedatmosphericco2 AT hwpolley nitrogenandcarboncyclinginagrasslandcommunityecosystemasaffectedbyelevatedatmosphericco2 AT hbjohnson nitrogenandcarboncyclinginagrasslandcommunityecosystemasaffectedbyelevatedatmosphericco2 |