Stomatal Limitation Is Able to Modulate Leaf Coloration Onset of Temperate Deciduous Tree

Autumn phenology, determined mainly by temperature and photoperiod, is essential for ecosystem carbon sequestration. Usually, the variations in maximum rate of Rubisco (Vcmax) ribulose-bisphosphate regeneration (Jmax) are taken as mechanism regulating seasonal pattern photosynthetic rates autumn phenology. In this study, we used Quercus mongolicus seedlings an example to examine photosynthetically physiological leaf coloration onset (LCO) responding different warming photoperiod treatments based on experimental data acquired from large artificial climate simulation chambers. The results indicated that: (1) LCO net CO2 assimilation (Pn), transpiration (Tr), stomatal conductance (Gs), Vcmax, Jmax were significantly affected changes photoperiod. (2) was correlated only with Pn approach, supporting view that senescence result a trade-off between nutrient resorption reserves. (3) major variation (Gs) which regulates rates, implying both limitations photosynthetical capacity (Vcmax Jmax, non-stomatal limitation) able modulate LCO. Our study riches knowledge phenology provides reference phenological modelling estimation.