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对具有观花、观果特点的苹果矮化砧B9和N29的光合速率日变化规律、光合补偿点等生理指标测定表明:B9、N29的光合速率高峰出现在上午的10时左右。但是B9表现为明显的一降不起的单峰趋势,N29呈现不明显的第二峰特点。峰值时N29的光合速率较新疆野苹果之光合速率高出21.78%,B9的光合速率值较新疆野苹果的光合速率只高出6.32%。B9、N29的Pn-PAR响应规律较为相似。在弱光和暗光下,N29的呼吸速率(Respeiration rate)为0.8651 CO2μmol/m.s,小于B9的呼吸速率(1.3697CO2μmol/m.s)。N29、B9的光补偿点(LCP)分别为64μmol/m.s和127μmol/m.s,说明N29的弱光利用能力高于B9。B9、N29的光饱和点(LSP)分别为1 412μmol/m.s和1 380μmol/m.s,表明B9的高光适应能力较强。在果树矮化栽培和园林景观配置栽培时应考虑B9、N29光合营养需求特点,以便达到果树增产和景观中的观花、观果、观叶效果。
The diurnal variation of photosynthetic rate and photosynthetic compensation point of apple dwarfing anvils B9 and N29 with ornamental flowers and ornamental fruits showed that the photosynthetic rate of B9 and N29 peaked at about 10 o’clock in the morning. However, B9 showed a significant unattainable single-peak trend, N29 showed an obvious second-peak characteristics. The peak photosynthetic rate of N29 was 21.78% higher than that of wild apple and the photosynthetic rate of B9 was only 6.32% higher than the photosynthetic rate of wild apple. The Pn-PAR responses of B9 and N29 were similar. Under low light and dark light, N29 had a respiratory rate of 0.8651 CO2μmol / m.s, which was lower than that of B9 (1.3697CO2μmol / m.s). The light compensation points (LCP) of N29 and B9 were 64μmol / m.s and 127μmol / m.s, respectively, which indicated that N29 had weaker light utilization ability than B9. The light saturation points (LSPs) of B9 and N29 were 1 412μmol / m.s and 1 380μmol / m.s, respectively, indicating that B9 had a high light adaptability. In the dwarf cultivation of fruit trees and landscape configuration cultivation should consider the B9, N29 photosynthetic nutrient demand characteristics, in order to achieve the fruit yield and landscape ornamental flowers, fruit, foliage effect.