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以不同浓度NaCl(0、200、400和600mmol·L-1)处理后的银水牛果盆栽幼苗为试验材料,利用Li-6400便携式光合测定系统对其光合生理特性的光响应进行研究。结果表明:不同的光合有效辐射(PAR)强度及土壤盐分浓度会对银水牛果的的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间CO2浓度(Ci)及水分利用效率(WUE)产生不同的影响。(1)随着盐浓度的增加和胁迫时间的延长,银水牛果幼苗叶片Gs、Pn、Tr均有下降趋势,但只有在600mmol·L-1NaCl处理下银水牛果的光合能力、Tr和Ci才显著降低;(2)当PAR为400～2000μmol·m-2·s-1、NaCl浓度低于600mmol·L-1时,银水牛果叶片具有较高的Pn和光能利用能力,且能维持较高的WUE。综上所述,银水牛果具有较强的耐盐性,对光辐射适应范围较广,适合在我国盐碱地和高原地区进行大面积的种植。
The potted seedlings of silver buffalo treated with different concentrations of NaCl (0, 200, 400 and 600 mmol·L-1) were used as experimental materials, and the photosynthetic physiological response of the plant was studied by Li-6400 portable photosynthesis system. The results showed that the net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and intercellular CO2 concentration (Ci) of silver buffalo were affected by different PAR and soil salinity, And water use efficiency (WUE) have different effects. (1) With the increase of salt concentration and prolonging of stress time, the Gs, Pn and Tr of silver buffalo seedling leaves showed a downward trend, but only under the treatment of 600mmol·L-1NaCl, photosynthetic capacity, Tr and Ci (2) When the concentration of PAR was 400 ~ 2000μmol · m-2 · s-1 and NaCl concentration was lower than 600mmol·L-1, the leaves of silver buffalo had higher Pn and light energy utilization ability, and could maintain Higher WUE. In summary, silver buffalo fruit has a strong salt tolerance, a wide range of light radiation to adapt to a large area suitable for planting in China’s saline-alkali land and plateau.