摘要： 为探明催花牡丹复壮栽培后植株生长状况,采用Li-6400光合作用分析仪对盆栽的4个常见春节催花牡丹品种催花复壮后的光合特性进行比较研究。结果表明:在春季自然花期,4个牡丹品种净光合速率(Pn)日变化呈单峰曲线,峰值出现在11:00左右,峰值最高的银红巧对比峰值最低的紫二乔高出44.39%;4个品种引起Pn降低的原因不完全相同,乌龙捧盛和百园红霞Pn降低的主要原因是气孔因素,紫二乔和银红巧对Pn降低则是气孔因素和非气孔因素共同作用的结果;4个品种的光饱和点(LSP)、光补偿点(LCP)、表观量子效率(AQY)品种间差异显著,紫二乔表观量子效率(AQY)为0.0203,显著低于其他3个品种,能更好地利用弱光。

关键词: 牡丹, 复壮栽培, 光合特性

Abstract: Photosynthetic characteristics of four rejuvenation}rown tree peony were studied comparatived with the LI-6400 portable photosynthetic analysis system before flower blossom. The result were as follows:Diurnal variation of net photosynthetic rate (Pn) in leaves of the four cultivars appeared a single-peak curve which occurring at about 11:00,and Paeonia suffruticosa Zierqiao has a lower Pn than Paeonia suffrutacosa Yinhongqiaodui,which Pn was 10. 52 umol/( m².s ).There were different reasons for the decrease of four cultivars ,Pn:the main reason for Paeonia suffrutacosa Wulongpengsheng and Paeonia suffrutacosa Baiyuanhongxia was stomatal factor while a combination of stomatal and non-tomatal factors caused the decrease of Pn in Paeonia suffrutacosa Zierqiao and tree peony Paeonia suffrutacosa Yinhongqiaodui. There was a significant difference in light saturation point(LSP),light compensation point (LCP) and appaent quantum yield (AQY) of the four cultivars. With the highest LSP and LCP tree peony Zierqiao was 0. 020 3 mol/mol in AQY which was significantly lower than others showing a better adaptation to the weak light.

Key words: Paeouia suffruticosa Andr., Rejuvenation growth, Photosynthetic characteristics

中图分类号: 

• S685.01