CK, SI and CI stand for ambient
[CO2], stepwise increase of
[CO2] by ~40 μmol
mol-1 in each season, and constant increase of
[CO2] by ~200 μmol
mol-1 for all seasons, respectively.T mean, T max andT min are daily mean air temperature, daily
maximum air temperature and daily minimum air temperature. Data is
mean±SD.
Table 2 Effects of different treatments of [CO2]
elevation, observation time, and their interactions on
Fv/Fm(maximum photochemical efficiency
of PSII),
ψo(the probability that trapped exciton moves an electron further than
QA), φEo (electron transport quantum
yield) and PIABS (performance index) during different
growth stages.