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| Titel |
Analysing net CO2 exchanges over an arable crop across multiple scales |
| VerfasserIn |
Emanuel Blei, Sylvia Toet, Andrew Revill, Jose Solis Parejo, Ben Keane, Harry Vallack, James Stockdale, Phil Ineson, Pete Levy, Ute Skiba, Julia Drewer, Daniela Famulari, Mathew Williams |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250112933
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| Publikation (Nr.) |
 EGU/EGU2015-13121.pdf |
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| Zusammenfassung |
| There is a critical need to better understand and up-scale greenhouse gas fluxes from
agricultural activities to support adaptation and mitigation activities at national scales.
A major unknown is the intrinsic scale of variability in fluxes from chamber to
field scales. This variation is linked to heterogeneity in management, soils and
microclimate. We made greenhouse gas fluxes measurements on a commercially
operated rapeseed-oil field in the east of England for a month from the start of the
growing season until the second fertiliser application (18th March to 16th April
2014). Our methods included using (1) sporadic box chamber measurements of
light response curves of CO2 exchanges; (2) a novel automated cable-operated
chamber system (SkyLine) developed by the University of York to measure CO2 fluxes
continuously from 18 chambers in the field; (3) an Eddy covariance system measuring
CO2 fluxes from a larger area on another part of the same field. For each data set
a simple model resolving gross primary production and ecosystem respiration,
and using LAI, photosynthetically active radiation (PAR) and air temperature as
drivers, was tuned to estimate net ecosystem exchange (NEE) for rapeseed oil. We
assess the model performance and parameter estimates across the three methods
and discuss the implications for scaling fluxes and correcting biases in upscaling. |
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