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Library Management effects on European cropland respiration

Management effects on European cropland respiration

Management effects on European cropland respiration

Resource information

Date of publication
december 2010
Resource Language
ISBN / Resource ID
AGRIS:US201301912712
Pages
346-362

Increases in respiration rates following management activities in croplands are considered a relevant anthropogenic source of CO₂. In this paper, we quantify the impact of management events on cropland respiration fluxes of CO₂ as they occur under current climate and management conditions. Our findings are based on all available CarboEurope IP eddy covariance flux measurements during a 4-year period (2004-2007). Detailed management information was available for 15 out of the 22 sites that contributed flux data, from which we compiled 30 types of management for European-scale comparison. This allowed us to address the question of how management activities influence ecosystem respiration. This was done by comparing respiration fluxes during 7, 14, and 28 days after the management with those observed during the matching time period before management. Median increases in respiration ranged from +83% (early season tillage) to −50% (rice paddy flooding and burning of rice residues) on the 28 days time scale, when only management types with a minimum of 7 replications are considered. Most management types showed a large variation among events and between sites, indicating that additional factors other than management alone are also important at a given site. Temperature is the climatic factor that showed best correlation with site-specific respiration fluxes. Therefore, the effect of temperature changes between the time periods before and after management were taken into account for a subset of 13 management types with adequate statistical coverage of at least 5 events during the years 2004-2007. In this comparison, late-season moldboard ploughing (30-45cm) led to highest median increase in respiration on the 7 days timescale (+43%), which was still +15% in the 28 days comparison. On average, however, management-induced increases in respiration losses from croplands were quite moderate (typically

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Authors and Publishers

Author(s), editor(s), contributor(s)

Eugster, Werner
Moffat, Antje M.
Ceschia, Eric
Aubinet, Marc
Ammann, Christof
Osborne, Bruce
Davis, Phillip A.
Smith, Pete
Jacobs, Cor
Moors, Eddy
Le Dantec, Valérie
Béziat, Pierre
Saunders, Matthew
Jans, Wilma
Grünwald, Thomas
Rebmann, Corinna
Kutsch, Werner L.
Czerný, Radek
Janouš, Dalibor
Moureaux, Christine
Dufranne, Delphine
Carrara, Arnaud
Magliulo, Vincenzo
Di Tommasi, Paul
Olesen, Jørgen E.
Schelde, Kirsten
Olioso, Albert
Bernhofer, Christian
Cellier, Pierre
Larmanou, Eric
Loubet, Benjamin
Wattenbach, Martin
Marloie, Olivier
Sanz, Maria-José
Søgaard, Henrik
Buchmann, Nina

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