大棚嫁接黄瓜净光合速率与生理生态因子的关系

试验以大棚嫁接黄瓜为材料,采用美国LI-COR公司生产的LI-6400型便携式光合仪测定其结瓜期净光合速率并分其与生理生态因子的相关性,从而为大棚黄瓜的栽培管理提供科学依据和指导性建议.结果表明,大棚嫁接黄瓜的净光合速率、光合有效辐射、气孔导度和蒸腾速率均呈单峰型变化,胞间CO2浓度和空气CO2浓度均呈"U"形变化,叶温和空气温度均呈倒"U"型变化.大棚嫁接黄瓜Pn最优化方程:y=-11.28+0.0393x1+0.005 3x2+0.3587x3+8.8122x6,偏相关分通径分析的结果得出,生理生态因子对Pn影响的顺序为气孔导度>光合有效辐射>空气温度(z6>z1>z3),表明对Pn起直接主要作用的是气孔导度和光合有效辐射.

Correlation between Net Photosynthetic Rate and Eco-physiological Factors of Grafting Cucumber in a Greenhouse

The correlation between net photosynthetic rate and eco-physiological factors of grafting cucumber planted in a greenhouse was determined by LI-6400 portable photosyntometer to provide the scientific basis and guiding suggestion for cucumber cultivation management in a greenhouse. The results showed that the net photosynthetic rate, photosynthesis effective radiation, stomatal conductance and transpiration rate of grafting cucumber in a greenhouse all were single-peak curves, the concentration of intercellular CO_2 and air CO_2 were "U" curves, and the leaf and air temperature were inverted "U" curves. The optimum equation of net photosynthetic rate was y=-11.28+0.039 3x_1+0.005 3x_2+0.3587x_3+8.812 2x_6. The partial correlation path analysis showed that the eco-physiological factors affecting net photosynthetic rate were stomatal conductance> photosynthesis effective radiation>air temperature, which indicates that stomatal conductance and photosynthesis effective radiation have the significant effect on net photosynthetic rate of grafting cucumber planted in a greenhouse.