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Título:
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Soil carbon dioxide flux and organic carbon content: effects of tillage and nitrogen fertilization
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Autor/a:
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Morell Soler, Francisco Joaquín; Cantero-Martínez, Carlos; Lampurlanés Castel, Jorge; Plaza Bonilla, Daniel; Álvaro-Fuentes, Jorge
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Notas:
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Th e response of soil CO2 fl ux to long-term tillage practices (no-tillage, NT; minimum tillage, MT; conventional
tillage, CT) and N fertilization level (zero; medium, 60 kg N ha–1; high, 120 kg N ha–1) was studied during three
growing season in a rainfed Mediterranean agroecosystem. Soil CO2 fl ux was related to the crop growth, with the
highest fl ux during spring (i.e., March–May). Tillage and N fertilization eff ects on soil CO2 fl ux during growing
seasons depended on weather conditions: greater soil CO2 fl ux under MT and NT on dry years, greater under
CT and MT on a wet year. Nitrogen fertilization aff ected soil CO2 fl ux during this wet growing season: fl ux
with N fertilizer additions was higher than fl ux on the unfertilized plots. Th irteen years aft er establishment of the
experiment, the soil organic carbon (SOC) stock under long-term NT was 3.9 Mg C ha–1 greater than under CT
and 4.3 Mg C ha–1 greater than under MT. Th e SOC stocks with N fertilizer additions were 4 Mg C ha–1 greater
than the stock on unfertilized plots. Th e increase of C inputs with N fertilization was more pronounced under NT
than under MT or CT. For this reason the increased response of SOC stock to N fertilization is expected under
NT in a longer period of time. Th e product between soil water content and soil temperature explained between 75
and 94% of the seasonal variability of soil CO2 fl ux. However, soil CO2 fl ux and SOC stock were hardly related.
This work was supported by the Comision Interministerial de Ciencia y Tecnologia of Spain (Grants AGL 2004-07763-C02-02 and AGL2007- 66320-CO2-02/AGR). |
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Materia(s):
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-Conventional Tillage
-Nitrogen level factor
-Growing season |
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Derechos:
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(c) Soil Science Society of America, 2011
info:eu-repo/semantics/restrictedAccess |
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Tipo de documento:
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article
publishedVersion |
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Editor:
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Soil Science Society of America
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