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以引进的3个葡萄柚品种“哈路比”、“火焰”和“瑞路比”为研究对象,用Li-6400便携式光合仪测定光合特性并对比其光合特性的差异。结果表明:“哈路比”的净光合速率(Pn)、气孔导度(Gs)和水分利用率(WUE)最高,“火焰”次之,“瑞路比”最低;“瑞路比”的蒸腾速率(Tr)最高,“哈路比”最低;“火焰”的胞间CO2浓度(Ci)最高,“哈路比”次之,“瑞路比”最低;不同品种葡萄柚的净光合速率日变化为“双峰”曲线,具有明显的“午休”现象;蒸腾速率日变化总体趋势是先升后降。
The photosynthetic characteristics of three grapefruit cultivars, “Ha Lu Bi”, “Flame” and “Ruilu Bi”, were studied with Li-6400 portable photosynthesis system and compared with their photosynthetic characteristics . The results showed that the net photosynthetic rate (Pn), stomatal conductance (Gs) and water use efficiency (WUE) of “Haobby” were the highest, followed by “Flame” and “Ruiluobi” The highest transpiration rate (Tr), the lowest “Ha Lu Bi”, the highest “Intercellular CO2 concentration” (Ci), the “Ha Lu Bi” The daily change of net photosynthetic rate of different cultivars grapefruit was “double peak” curve, with obvious phenomenon of “lunch break”. The overall trend of diurnal variation of transpiration rate was firstly and then decreased.