The response of ecosystem carbon fluxes to LAI and environmental drivers in a maize crop grown in two contrasting seasons
2016
Vitale, Luca | Di Tommasi, Paul | D’Urso, Guido | Magliulo, Vincenzo
The eddy correlation technique was used to investigate the influence of biophysical variables and crop phenological phases on the behaviour of ecosystem carbon fluxes of a maize crop, in two contrasting growing seasons. In 2009, the reduced water supply during the early growing stage limited leaf area expansion, thus negatively affecting canopy photosynthesis. The variability of gross primary production (GPP) and ecosystem respiration (R ₑcₒ) was mainly explained by seasonal variation of leaf area index (LAI). The seasonal variation of R ₑcₒ was positively influenced by soil temperatures (T ₛₒᵢₗ) in 2008 but not in 2009. In 2008, a contribution of both autotrophic and heterotrophic components to total R ₑcₒ could be hypothesized, while during 2009, autotrophic respiration is supposed to be the most important component. Crop phenological phases affected the response of ecosystem fluxes to biophysical drivers.
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