日光温室环境因子对冬茬黄瓜光合速率日变化的影响

The Environmental Factors of Solar Greenhouse in Winter and Its Influence on the Diurnal Variation of Photosynthetic Rate of Cucumber

对冬茬日光温室黄瓜不同生育期的温、光、水、气和光合速率日变化进行了测定和分析。结果表明：在黄瓜不同生育期，光合速率日变化均存在两种类型，以双峰型曲线变化的叶片占多数。冬茬黄瓜光合日变化总的趋势与光照强度变化一致，光合速率以深冬最低，秋末最高，早春介于前两者之间。采用投影寻踪回归分析初步表明：深冬和早春晴天条件下均以温度和ＣＯ２浓度对光合速率影响较大，秋末以光强影响较大。各生育期光合速率午间降低与水分利用效率的下降有关。

The temperature,light,water,gas and the daily variation of photosynthetic rate of winter cucumber in different growth stages were studied and analysed,the results showed:In different growth stages,there are two types of daily variation of photosynthetic rate,and the leaves of the bi pinnacle curved variation prevail.The dominant tendency of the daily variation of photosynthesis jibes with that of the photon flux density,the photosynthetic rate is the lowest during late winter,but highest in late autumn.The PP regressive analysis showed that the influence of temperature and CO 2 concentration of late winter and early spring was greater than other factors;Light density greatly affected the photosynthetic rate the decrease of noon photosynthetic rate was related to the decrease of water utilization efficency.