高浓度CO_2对蝴蝶兰CO_2吸收速率和生长的影响

Effects of Elevated CO_2 Concentration on Growth and Carbon Fixation of Phalaenopsis‘sogo Benz sogo’

研究了CO2(700±50)μmol·mol-1、(1000±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30d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(1000±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60d,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150d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 CO2 fixation of Phalaenopsis were studied under 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 （ long-term experiment） after exposure to the corresponding CO2 concentrations. The results showed that the net CO2 absorption rate 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. Elevated CO2 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 （ soluble sugar 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 dry mass 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 effects on the growth of Phalaenopsis.