| Registro completo |
| Provedor de dados: |
NWISRL
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| País: |
United Kingdom
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| Título: |
Management of irrigated agriculture to increase carbon storage
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| Autores: |
Sojka, R.E.
Entry, J.A.
Shewmaker, G.E.
Fuhrmann, J.J.
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| Data: |
2007
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| Ano: |
2007
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| Palavras-chave: |
Mass Import - unclassified
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| Resumo: |
Fossil fuel burning at the present rate, will double atmospheric carbon dioxide (CO 2 ) in this century, raising air temperature 1.5 to 5 °C. Sequestering carbon (C) in soil can reduce atmospheric CO2 concentration. We measured inorganic and organic C in southern Idaho soils having long term land use histories of native sagebrush vegetation (NSB), irrigated moldboard plowed crops (IMP), irrigated conservation- (chisel) tilled crops (ICT) and irrigated pasture systems (IP). Soil Organic C (SOC) decreased in the order IP>ICT>NSB>IMP. We used our findings to estimate potential amounts of organic C sequestered if irrigated agriculture expanded. If irrigated agricultural land was expanded by10°/0 worldwide and NSB was converted to ICT, 2.5 x 10 9 Mg organic C (4.38 °A of the total C emitted in the next 30 yr) could potentially be sequestered in soil. If irrigated agricultural land were expanded by 10% worldwide and NSB were converted to IP, a possible 9.3 x 109 Mg organic C (16.32 % of the total C emitted in the next 30 yr) could be sequestered in soil. Irrigated agriculture produces twice the yield compared to non-irrigated land. Irrigation increases soil C relative to native semi arid or arid sites. Since irrigated agriculture produces higher yields, less land area needs to be put into production compared to rainfed agriculture. Altering land use to produce crops on high output irrigated agriculture, while returning less-productive rainfed agricultural land to temperate forest or native grassland, could further reduce atmospheric CO2 . Inorganic carbon increases with irrigation were less consistent and much smaller than SOC. Irrigating these soils also increased microbial biomass and changed microbial diversity.
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| Tipo: |
Conference or Workshop Item
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| Idioma: |
Inglês
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| Identificador: |
http://eprints.nwisrl.ars.usda.gov/857/1/1225.pdf
Sojka, R.E. and Entry, J.A. and Shewmaker, G.E. and Fuhrmann, J.J. (2007) Management of irrigated agriculture to increase carbon storage. pp. 189-202. In: Currie, L.D. and Yates, L.J. (eds.) Proceedings of the Fertilizer & Lime Research Centre Workshop. Designing Sustainable Farms: Critical Aspects of Soil and Water Management. New Zealand-Palmerston North, 2007/02/08-09.
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| Relação: |
http://eprints.nwisrl.ars.usda.gov/857/
1225
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| Formato: |
application/pdf
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