Figure 5

Relationship between the naked oat yield and photosynthetic rate (a), intercellular CO2 concentration (b), stomatal conductance (c), transpiration rate (d), initial fluorescence value (Fo) (e), maximum fluorescence value (Fm) (f), variable fluorescence of PSII (g), Fv/Fm (h) and Fv/Fo (i) in the Bashang area, Hebei Province, China. The solid line represents the linear trend for each variable. *P < 0.05. **P < 0.01.