设施栽培对杨梅光合特性的影响

为了研究设施栽培对杨梅光合作用特性的影响，以‘丁岙’杨梅（cv. ‘Dingao’）为试材，于2011年5月（杨梅果实发育期）用Li-6400光合作用仪测定大棚内外杨梅叶片的净光合速率（Pn）、胞间CO2浓度（Ci）、光合有效辐射（PAR）、叶片温度（Tleaf）、空气相对湿度（RH）等生理生态因子的日变化，同时对大棚内外‘丁岙’杨梅的叶片光响应、CO2响应曲线进行测定。结果表明，大棚内外杨梅Pn日变化都为双峰型曲线，大棚杨梅的CO2补偿点、饱和点以及净光合速率要大于大棚外杨梅；Pn与PAR、CO2浓度呈双曲线关系，与RH呈二次曲线关系，与Tleaf呈三次曲线关系。杨梅光合特性与环境因子有密切关系，研究结果可为设施杨梅环境调控提供理论支持。

Effect of Facility Cultivation on Photosynthetic Characteristics of Myrica rubra

In order to study the effect of facility cultivation on photosynthetic characteristics of Myrica rubra leaves. Experiment was carried out in May 2011 with ＇ Dingao ＇ as test materials （cultivar at development stage）. The daily variation of eco-physiological factors of Myrica rubra on the internal and external greenhouse were measured using Li-6400 portable photosynthesis system in May, 2011： net photosynthetic rate （Pn）, intercellular CO 2 concentration （Ci）, photosynthetic available radiation （PAR）, leaf temperature （T leaf ）, air relative humidity （RH） and so on. Also light response, CO 2 response curve of ＇ Dingao ＇ leaves on the internal and external greenhouse was measured to study the effects of facility cultivation on photosynthetic characteristics of Myrica rubra. The results showed that： Pn curves of Myrica rubra were both double-peak, the CO 2 compensatory point, CO 2 saturation point and net photosynthetic rate on the internal greenhouse were higher than that on the external greenhouse; there existed a hyperbolic relationship between Pn and PAR. A conic-curve relationship was found between CO 2 concentration and RH, a cubic-curve relationship between Pn and T leaf . The photosynthetic characteristics of Myrica rubra and environmental factors had a close relationship. The results could provide theoretical support for environment control of facility Myrica rubra.