日光温室油桃光合特性的观察研究

Observation on the Photosynthesis Characteristics of Prunus persick var. nectarina Maxim in Greenhouse

观察结果表明,日光温室内油桃的净光合速率以晴天10:00和14:00时较高,12:00时稍低,表面为“双峰”曲线。而阴天时表现为“单峰”曲线,12:00时净光合速率最高。晴天时,日光温室内油桃的净光合速率在12:00时降低的主要原因是由日光温室内空气中CO2浓度不足引起的,适宜日光温室内主要环境因子CO2 的浓度不得低于310．1μL·L 1．适宜的温度为21．0-32．5℃,空气相对湿度不得低于45．3％。

Prunus persick var. nectarina Maxim cultivated in heliogreenhouse has a higher net photosynthetic rate at 10:00 am and 14:00 pm in a clear day, while a lower rate at 12:00, and demonstrated as bimodal distribution curve. In a overcast day, a monomodal distribution curve, which shows maximum net photosynthetic rate at 12:00 pm, is obtained. And the reason why Prunus persick cultivated in heliogreenhouse gives lower net photosynthetic rate in a fine day at 12:00 pm is the shortage of CO2. The major environmental factors are favorable when the concentration of CO2 is no less than 310. 1μL· L-1, the temperature is 21. 0-32. 5C and the relative humidity is no lower than 45.3%.