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以温室嫁接黄瓜为试材,设亚高温、CO_2加富+亚高温、CO_2加富+常温3个处理,以常温管理为对照(CK),研究了CO_2加富和短期昼间亚高温对植株长势、产量和光合作用的影响,以期为温室黄瓜生产中合理施用CO_2、调控温度提供理论依据。结果表明:各处理对嫁接黄瓜的株高、茎粗、单瓜生长速度和产量均有显著影响,处理25d后CO_2加富+亚高温处理在株高、茎粗、瓜长和瓜粗生长速度及产量上,分别显著高于对照37%、19%、15%、21%和38%,CO_2加富+常温处理除瓜长、瓜粗生长速度与亚高温+CO_2处理差异不显著外,其余均显著低于亚高温+CO_2处理,各指标均显著高于亚高温处理和对照。CO_2加富+亚高温处理、CO_2加富+常温处理和CK对黄瓜叶片净光合速率日变化影响均呈双峰曲线,高峰值分别在10:00和14:00时,其中在10:00时,各处理的净光合速率为CO_2加富+亚高温>CO_2加富+常温>CK>亚高温,亚高温处理的黄瓜叶片净光合速率日变化影响均呈单峰曲线;各处理对黄瓜叶片蒸腾速率日变化影响呈现先升高后降低的趋势,在12:00左右达到最高值,蒸腾速率分别为CO_2加富+亚高温>常温+CO_2加富>亚高温>CK;黄瓜叶片的胞间CO_2浓度随着时间的变化呈先降低后升高、再降低后升高的“W”趋势。
The greenhouse cucumber (Cucumis sativus L.) was used as the test material, and hypothermia, CO_2 enrichment + sub-high temperature, CO_2 enrichment + normal temperature treatment were used to study the effects of CO_2 enrichment and short- Growth, yield and photosynthesis, with a view to provide a theoretical basis for the rational use of CO_2 in the greenhouse cucumber production, temperature regulation. The results showed that all the treatments had significant effects on plant height, stem diameter, single melon growth rate and yield of grafted cucumber. After 25 days of treatment, CO 2 enrichment + sub-high temperature treatment had significant effects on plant height, stem diameter, And the yield were significantly higher than the control 37%, 19%, 15%, 21% and 38%, CO_2 plus rich + normal temperature in addition to the melon length, melon rough growth rate and sub-high temperature + CO_2 treatment was no significant difference Were significantly lower than the sub-high temperature + CO 2 treatment, the indicators were significantly higher than the sub-high temperature treatment and control. The effects of CO_2 enrichment + sub-high temperature treatment, CO_2 enrichment + normal temperature treatment and CK on the diurnal variation of net photosynthetic rate of cucumber showed double-peaked curves with peak values at 10:00 and 14:00, respectively, at 10:00 , And the net photosynthetic rate of all the treatments was single peak curve. The diurnal variation of net photosynthetic rate of cucumber leaves treated with CO_2 plus rich + hypothermal> CO 2 rich + normal temperature> CK> The diurnal variation of diurnal variation showed the trend of increasing firstly and then decreasing, and reached the highest value at about 12:00. The transpiration rates were CO 2 enrichment + sub-high temperature> room temperature + CO 2 enrichment> sub-high temperature> CK, Concentration decreased with time and then increased, then decreased and then increased the “W ” trend.