关键词: 草莓, 光合特性, 光能利用效率, 电能利用效率

Abstract: Using strawberry as material and laser plant growth lamp (light quality composition red: blue=7:1) as light source, this paper studied the effects of different light supplement positions (top light supplement C1, horizontal light supplement C2 and no light supplement CK) on photosynthetic characteristics, light use efficiency (LUE) and electric use efficiency (EUE) in solar greenhouse. The results showed that: ①Compared with CK, C1, C2 significantly increased plant growth, and root development was better under C1. ② Through the observation of the photosynthetic characteristics of plants from north to south (I~V) in the greenhouse on cloudy days, it was found that the difference of net photosynthetic rate (Pn), stomatal conductance (Gs) and intercellular CO2 concentration (Ci) between north and south was the largest in CK and the smallest in C2. ③The chlorophyll fluorescence parameters of leaves at 10:00 and 14:00 were measured under cloudy sky. It was found that the highest value of Fv/Fm and Fv/Fo was C2, and CK was the lowest; the highest value of NPQ was CK, and C2 was the lowest. ④ During the ripening process, the LUE in each treatment of strawberry fruit declined first, then increased and then decreased, and reached the maximum at 21 d after flowering. The variation trend of the EUE in each treatment was the same as that of light energy, reaching the maximum 14 d after the flowering. The quantum of light required to produce strawberry fruit per unit mass was the maximum CK (4905) and the minimum C1 (3171). The energy consumption per unit mass produced by C1 and C2 was 8207 and 8507 kJ·g-1, respectively. ⑤ The single fruit weight, yield, sugar, acid and VC of strawberry fruits treated with C1 and C2 were better than CK.

Key words: strawberry, photosynthetic characteristics, light use efficiency, electric use efficiency