关键词: 牡丹, 光合特性

Abstract: Variation of Photosynthetic characteristics of Dafengling stage (before blooming period) and leaf-expansion stage (after blooming period) of potted and field Paeonia suffruticosa Andr.cv. 'Luoyanghong' were comparatively studied with LI-6400 portable photosynthetic analysis system, the effects of different cultivated method on photosynthetic physiological characteristics of Paeonia suffruticosa Andr. was illustrated. The results were as follows: the light saturation point(LSP) and light compensation point(LCP) of leaves of potted peony were about 923 and 109 μmol﹒m-2﹒s-1 respectively, and the apparent quantum yield(AQY) was 0.0173 at Dafengling stage, while the LSP and LCP of leaves of field peony were about 1 089 and 45 μmol﹒m-2﹒s-1 respectively, and the AQY was 0.0206 in the same time. Diurnal variation of net photosynthesis rate (Pn) in leaves of potted and field peony appeared "single-peak" curve in the two periods which occurring at about 10:00, and decreased by 32.8﹪ and 39.3﹪compared with those of field peony, respectively. Seasonal variation of Pn showed that potted and field peony had the highest Pn in April which were 7.16 and 10.02 μmol﹒m-2﹒s-1 respectively and the lowest Pn in September.The chlorophyll contents had 15.6﹪ decline in Dafengling stage and 20.4﹪ decline in leaf-expansion stage compared with the peony in field. Lower Pn in potted peony might be one of the main reasons leading to bad growth.

Key words: Paeonia suffruticosa Andr., photosynthetic characteristics