Abstract:

The production and quality of tea were very close to growing environment, in order to clarify the effects of different canopy closure on photosynthetic diurnal variation of tea in forest-tea compound model, this study by using the LI-6400 portable photosynthesis system, the effects of different canopy closure, 0.3(T1), 0.6(T2) and 0.9(T3), on photosynthetic diurnal variations of tea plants in Koelreuteria paniculata-Camellia sinensis compound systems were studied, with pure tea garden as the control. The results were as follows: with canopy density increased, daily mean value and difference value of radiation (PAR)，leaf temperature (Tl) had a descending trend, diurnal variation showed single peak curve. Net photosynthetic rate (Pn) decreased with canopy closure increased and showed double-peak curve. Contrary to T2 and T3, stomatal conductance (Gs) and transpiration rate (Tr) were inhibited obviously and showed double-peak curve under CK and T1 treatment.