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Planted peony the six varieties 'proud yang', 'powder in the crown', 'Sapphire', 'Stars', 'Yeongil red' and 'Zhu ink Run' as experimental material, the first time under different light intensity (100 %, 65%, 45% and 15% of natural light intensity, respectively referred to as the control, mild shade, moderate shade and severe shading) Peony photosynthetic characteristics (photosynthesis - light response curve, photosynthetic gas exchange parameters, photosynthetic pigments content, soluble protein content, leaf area, stomatal density) and flower quality (the number of flowering, flower diameter, weight, and number of petals, flowers length, color) were measured and comprehensive quantitative evaluation results show that: 1, under full sunlight Peony higher light saturation point and light compensation point of all varieties, the shade treatment under light saturation point and light compensation point reduced to varying degrees. Mild shading treatments, 'powder in the crown', 'Sapphire' and 'Zhu ink Run' three varieties of net photosynthetic rate than the control significantly improved, there was no significant difference in net photosynthetic rate with the control of the other varieties; moderate shading treatments under 'proud yang' and 'Zhu ink Run' two varieties of net photosynthetic rate than the control significantly improved, and the remaining varieties of net photosynthetic rate and the control did not significantly with differences; severe shade handle all the tested varieties of net photosynthetic rate than the control significantly reduced. With the reduction of light intensity, peony varieties chlorophyll a, chlorophyll b, total chlorophyll and carotenoid content gradually increased, but inconsistent trend of chlorophyll a / chlorophyll b ratio of all varieties, with the control and there was no significant difference. 2, mild shade powder in the crown 'under treatment', 'Sapphire' and 'Yeongil red' soluble protein content has increased compared with the control, the other three species decreased; moderate shading 'powder in the crown 'soluble protein content significantly increase, reduce other varieties; severe shading' powder in the crown 'soluble protein content, there was no difference with the control, the remaining five species soluble protein content than the control significantly reduced. 3, mild, moderate shading tree peony varieties of leaf area increased significantly compared with the control; severe shading 'proud yang' and 'Zhu ink Run' leaf area has been reduced compared with the control, the remaining species than the control significantly increases, but more moderate shading treatments reduced; significant reduction in the shading treatments peony variety stomatal density compared with the control. 4, light, moderate shade under the 'star' flowering reduce the number of flowers diameter decreases, reduce the weight of the remaining five species of flowering increase in the number of groups of flowering extended flower diameter increased, the the ornamental quality has improved; severe cover under the shadow of all cultivars tested, the number of flowering petals decrease in the number of flower diameter decreases, weight, squid shorter length reduces the ornamental quality; severe shade 'Pink in the crown' petal color is significantly lighter, each shading treatments under other color peony petals color did not change significantly compared with the control, but under each shade treatment 'Sapphire', 'star' and 'Yeongil red' three varieties petal base stain color than the control significantly lighter. Comprehensive evaluation mild shade 'Yeongil red' and 'Zhu Ink Run' composite score for A 'star' is D, the remaining three species B; moderate shading, Zhu ink Run ' The composite score for A 'powder in the crown' and 'star' comprehensive score of C, the remaining varieties for B; severe shading, 'Sapphire' and 'Yeongil red' composite score for E, other varieties F. The results, showed that Peony heliophilous, but light wide ecological amplitude, shade tolerance, most varieties grow well in the light of the 65% of the light to 45%, ornamental quality improve. 15% of the light inhibits photosynthesis of peony all cultivars tested, reduced flower quality.
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