Photosynthetic characteristics of Sarcandra glabra
Objective: To learn about the photosynthetic characteristics of Sarcandra glabra and provide the theoretic references for its better planting. Method: The photosynthetic parameters of twenty different provenances of Sarcandra glabra were determined by Li-6400 portable photosynthesis system, and the data was analyzed by Excel and SAS software. Result: The results showed that the light saturation point of different Provenances of S. glabra were almost about 800 (μmol·m~(-2)·s~(-1) , while the light compensation point of them were from 14. 70 μmol·m~(-2)·s~(-1) to 48. 68 μmol·m~(-2)·s~(-1), The curve of net photosynthetic rate had two peaks on sunny day, the first one was in the morning and the other one was in the afternoon. The photosynthetic " noon- break" of S. glabra appeared between 11 :00-13:00, when the net photosynthetic rate goes down sharply. Intercellular CO_2 concentration (C_i) , CO_2 concentration (CO_2S) and transpiration rate (T_r) all have effect on the diurnal change of net photosynthetic rate (P_n) of S. glabra, and the average correlation coefficient between P_n and the parameters above were orderly as -0. 89 (P <0. 01) , -0.75 (P<0. 05) and 0. 69(P <0. 05) ; Conclusion; 5. glabra was a plant with characteristics of shade-tolerance, and through the way of covering, sprinkling for decreasing the surrounding temperature would be effective to reduce its " noon-break" time and increas its efficiency of photosynthesis.
NETL
NSTL
万方数据
维普
