采用完全随机区组设计，研究了留茬高度（15、10和5 cm）及平茬时间（11月和2月）对凤丹（Paeonia ostii T. Hong et J. X. Zhang）3年生实生苗生长、光合生理和结实的影响。结果表明：随留茬高度的降低，凤丹的冠幅、单株新生枝数量、单株叶面积、比叶质量、叶片的光合作用参数〔包括净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）和水分利用效率（WUE）〕和叶绿素含量、果荚直径、单果荚籽粒数以及百粒质量均呈逐渐增加的趋势，且明显高于对照（未平茬处理）组。在同一留茬高度，随着时间的推移，凤丹叶片的Pn、Gs和WUE值以及叶绿素含量呈逐渐降低的趋势，Tr值呈逐渐升高的趋势。11月平茬处理组凤丹植株和叶片的生长指标、叶片光合作用参数以及结实指标总体上高于2月平茬处理组。方差分析结果表明：留茬高度处理组间凤丹的植株生长指标、叶片光合作用参数和叶绿素含量以及结实指标均存在极显著差异，平茬时间处理组间凤丹的植株生长指标和结实指标总体上存在极显著差异，其他指标间均无显著差异。总体上看，留茬高度5 cm和11月平茬处理利于凤丹塑造株型和提高光合效率，能够为优产和高产提供更有利的生长条件。

Effects of stubble height （15， 10， and 5 cm） and stumping time （November and February） on growth， photosynthetic physiology， and fruiting of 3-year-old seedling of Paeonia ostii T. Hong et J. X. Zhang were studied based on randomized complete block design. The results show that with the decrease of stubble height， crown width， new branch number per plant， leaf area per plant， specific leaf mass， photosynthetic parameters 〔including net photosynthetic rate （Pn）， stomatal conductance （Gs）， transpiration rate （Tr）， and water use efficiency （WUE）〕 and chlorophyll content in leaf， pod diameter， grain number per pod， and 100-grain mass of P. ostii all show a tendency to increase gradually， and are evidently higher than those in the control （no stumping treatment） group. At the same stubble height， with prolonging of time， Pn， Gs and WUE values， and chlorophyll content in leaf of P. ostii show a tendency to decrease gradually， while its Tr value shows a tendency to increase gradually. Growth indexes of plant and leaf， leaf photosynthetic parameters， and fruiting indexes of P. ostii in stumping treatment group in November are higher than those in stumping treatment group in February generally. The variance analysis result shows that there are extremely significant differences in plant growth indexes， photosynthetic parameters and chlorophyll content in leaf， and fruiting indexes of P. ostii among stubble height treatment groups， extremely significant differences in plant growth indexes and fruiting indexes of P. ostii among stumping time treatment groups in general， and no significant difference in other indexes. Overall， stubble height of 5 cm and stumping treatment in November are beneficial to shaping plant type and enhancing photosynthetic efficiency of P. ostii， and can provide more favorable growth conditions for superior and high yield.