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Relationships between the net ecosystem CO2 exchange at a photon flux density (PFD) of 2000 μmol m−2 s−1 (NEE2000), the gross primary productivity at a PFD of 2000 μmol m−2 s−1 (GPP2000), the ecosystem respiration at a reference temperature of 10 °C (R10) and the light use efficiency (LUE) in response to leaf area index (LAI) at the study sites. Regressions are based on all available data during the growing seasons from 2002 to 2008. For regression statistics see Table 2.
