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棚内CO2 浓度日变化幅度远大于棚外 ;在天气晴好、光合旺盛、通风受阻时 ,棚内CO2 匮乏可成为光合作用的主要限制因子。在保护地条件下 ,油桃光合速率 (Pn)日变化由露地的双峰曲线变为三峰曲线 ,最大Pn比露地提前 2h ,在 8时左右出现 ;光合“午休”现象不明显 ;晴天棚内日平均Pn为 5 .97(CO2 ) μmol/m2 ·s,比露地降低17.2 5 %。棚内CO2 加富对油桃光合作用和产量、品质有重要影响 ,较大幅度地提高了上午 8时～ 12时之间的Pn和光能利用率 ,日平均Pn 6 .95 (CO2 ) μmol/m2 ·s ,比对照提高 2 5 .90 %。树体生长健壮 ,生物量 (未含果实 )增加 12 .4% ,比叶重增大 ,产量提高 19.80 % ,品质改善
The diurnal variation of CO2 concentration in the greenhouse is much larger than that of the greenhouse. When the weather is sunny, the photosynthesis is exuberant and the ventilation is blocked, the CO2 deficiency in the greenhouse can be the main limiting factor of photosynthesis. The diurnal variation of photosynthetic rate (Pn) of nectarine changed from a bimodal curve to a three-peak curve in open field, and the maximum Pn appeared 2h earlier than open field and appeared at about 8 o’clock. The phenomenon of photosynthesis “lunch break” was not obvious. The average daily average Pn was 5.97 (CO2) μmol / m2 · s, which was 17.2 5% lower than the open field. CO2 enrichment in canopy had a significant impact on photosynthesis, yield and quality of nectarine, greatly improved the Pn and light energy utilization efficiency between 8 am and 12 am, and the average daily average Pn 6 .95 (CO2) μmol / m2 · s, an increase of 25.90% over the control. Tree growth robust, biomass (excluding fruit) increased by 12.4%, specific leaf weight increased, the yield increased by 19.80%, quality improvement