不同遮荫条件下牡丹的补偿性生长特性研究

Compensatory Growth Characteristics of the Peony under Different Shading Conditions

对牡丹品种洛阳红（Paeonia suffruticosa Andr.CV.Luoyanghong）进行不同强度的遮荫和枝叶去除处理，研究牡丹在遮荫条件下的补偿性生长特性。结果表明：在适度的遮光条件（如50％）和轻中度的枝叶去除强度（20％-50％）下，与对照及其它处理相比，牡丹的累积生物量增加，茎叶比减小，更新芽增多，剩余叶片叶绿素浓度提高，表现出明显的补偿性效应，趋向有利于牡丹生长的方向变化。在强度遮荫（80％）与强度枝叶去除（80％）条件下，除茎叶比外，牡丹其它各项指标均小于对照或与对照无显著差异，不适宜作为牡丹的优先生长条件。

The compensatory growth characteristics were studied in peony （Paeonia suffruticosa Andr. cv. Luoyang-hong） under different shading conditions. The results showed that under moderate shading （50%） and defoliation inten-sities（20%-50%） conditions, the compensatory effects were found as a result of a significant increase in the accumulated biomass, regenerated bud amount and chlorophyll concentration of remnant leaves but a significant decrease in the stem/leave ratio of peony when compared with those of CK and other treatments. All these changes were advantageous to the growth of peony. Under intense shading （80%） and defoliation intensities （80%） conditions, however, it was less than or no significant difference in each measured index in comparison with that of CK except the stem/leave ratio. So, such treatment was not a priority selection for peony as a favorable growth condition.