高浓度CO2 对蝴蝶兰CO2 吸收速率和生长的影响

 研究了CO₂ (700 ±50) μmol·mol^-1、(1 000 ±50) μmol·mol^-1、(360 ±30) μmol·mol^-1(对照) 对蝴蝶兰CO₂吸收速率和生长的影响。研究结果表明: 蝴蝶兰叶片净CO₂吸收速率在02∶00 达到最大, 可滴定酸积累在04∶00 达到最高; CO₂加富显著提高蝴蝶兰夜间的CO₂吸收速率, 在处理30 d时, 所测得的CO₂吸收速率的增幅分别为同期对照的134.11%和435.3% , 可滴定酸积累的分别比对照增加65.05%和119.42% , 随着处理时间的延长, CO₂吸收速率增幅逐渐下降; CO₂加富促进了叶片碳水化合物(可溶性糖和淀粉) 的积累, 在CO₂ (1 000 ±50) μmol·mol^-1处理组中碳水化合物积累的促进尤为明显;总生物量的测定表明, 处理60 d, 鲜样质量比同期对照增加了23%和49% , 干样质量增加了38%和57% ,处理150 d时, 鲜样质量比对照增加了50%和94% , 干样质量增加了19%和64%。以上结果表明CO₂加富能显著促进蝴蝶兰的生长。

Effects of Elevated CO2 Concentration on Growth and Carbon Fixation of Phalaenopsis 'sogo Benz sogo'

Effects of elevated CO₂ concentration on growth and CO₂ fixation of Phalaenopsis were studiedunder elevated CO₂ (700 ±50) μmol·mol^-1 , (1 000 ±50) μmol·mol^-1 ] and ambient CO₂ concentrations (360 ±30) μmol·mol^-1 , control ] at 30 d ( short-term experiment) and 150 d ( long2term experiment) after exposure to the corresponding CO₂ concentrations. The results showed that the net CO₂ absorp tionrate reached a maximum at 2 ∶00 A.M., with 134.11% in ( 700 ±50 ) μmol·mol^-1 and 435.3% in(1 000 ±50) μmol·mol^-1 higher than control at 30 d, while the increase rate decreased with time. ElevatedCO₂ resulted in the increase of the accumulation of titratable acids ( TA ) which increased by 65.05% in(700 ±50) μmol·mol^-1 and 119.42% in (1 000 ±50) μmol·mol^-1 at 30 d compared to control, but decreased slightly thereafter. Elevated CO₂ treatment also resulted in the accumulation of carbohydrates ( solublesugar and starch) in leaves, and the accumulation rate in ( 1 000 ±50 ) μmol·mol^-1 was higher than in(700 ±50) μmol·mol^-1. Compared with control, the fresh mass in (700 ±50) μmol·mol^-1 and (1 000 ±50) μmol·mol^-1 increased by 23% and 49% at 60 d, and 50% and 94% at 150 d, respectively; the drymass in (700 ±50) μmol·mol^-1 and (1 000 ±50) μmol·mol^-1 was increased by 38% and 57% at 60 d,and 19% and 64% at 150 d, respectively. These results demonstrated that elevated CO₂ has significant effect on the growth of Phalaenopsis.