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Título:
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Soil CO2 fluxes following tillage and rainfall events in a semiarid Mediterranean agroecosystem: Effects of tillage systems and nitrogen fertilization
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Autor/a:
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Morell Soler, Francisco Joaquín; Álvaro-Fuentes, Jorge; Lampurlanés Castel, Jorge; Cantero-Martínez, Carlos
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Notas:
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The response of soil CO2 flux to tillage operations and rainfall events was studied under semiarid
Mediterranean conditions. The study was conducted on a barley monoculture agro-ecosystem during
summer/autumn fallow periods in four consecutive years (2005–2008). The study compared three N
fertilization levels (zero, medium; 60 kgNha−1; high, 120 kgNha−1) under three tillage systems (NT,
no-tillage; MT, minimum tillage; CT, conventional tillage). Tillage operations led to a pulse of soil CO2
flux. This pulse was linearly related to soil CO2 flux on the day before tillage operations under MT
(slope = 4.22) and CT (slope = 16.7), indicating the extent of soil disturbances. However, the associated
soil CO2-C losses during tillage operations were reduced and similar among different tillage systems.
The soil CO2 flux after rainfall was higher under NT, where it was linearly related to soil temperatures
(0.15×soil temperature–1.06). Soil CO2 fluxes decreased on the following days as the soil dried. N fertilization
affected CO2 flux in 5 out of 35 observation days, with higher fluxes with N fertilization under
conservation tillage systems. Emissions after rainfall events led to large soil CO2-C losses, and these were
of higher magnitude under conservation tillage systems (NT and MT).
This work was supported with 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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-Semiarid
-Precipitation
-Long-term experiment |
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Derechos:
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cc-by-nc-nd (c) Elsevier, 2010
http://creativecommons.org/licenses/by-nc-nd/4.0/
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Tipo de documento:
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Artículo
Artículo - Versión aceptada |
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Editor:
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Elsevier
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Compartir:
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