牡丹对不同强度和频度去叶的补偿性生长响应

Compensory Growth Responses to Defoliation of Peony under Different Intensity and Frequency Conditions

[目的]找出有利于牡丹补偿性生长的最佳条件。[方法]对牡丹进行不同强度和频度去叶处理,观察幼苗去叶后的地上干物质积累量、更新芽数、茎叶比及剩余叶片叶绿素浓度的变化。[结果]20 d/次的去叶频度、40%-60%去叶强度时,牡丹的累积生物量最大;10d/次的去叶频度、60%-80%去叶强度时,更新芽数目最多;轻中度去叶（20%-60%）,茎叶比显著低于对照;20 d/次去叶频度、40%-60%去叶强度时,剩余叶片的叶绿素浓度显著高于对照。[结论]适当的去叶强度（60%）和较低的去叶频度（20 d/次）最有利于牡丹的生长和再生,表现为超补偿性生长。

[Objective]It was aimed to find optimum condition for compensatory growth of peony.[Method]The different defoliation intensity and frequencies of penoy were conducted to observe accumulative aboveground dry matter,regeneration bud number,stem-leaf ration and chlorophyll concentration change in residual leaves.[Result]When the defoliation was conducted every 20 d once and defoliaton frequency was from 40%-60%,the accumulative biomass was biggest while when When the defoliation was conducted every 10d once and defoliation frequency was from 60%-80% the regeneration bud number was most.The stem-leaf ratio of mild and moderate defoliation（20%-60%） was lower than that of control group.When the defoliation was conducted every 20 d once and defoliation frequency was from 40%-60%,the chlorophyll concentration in residual leaves was obviously higher than that of control group.[Conclusion]The proper defoliation intensity（60%） and lower defoliation frequency（defoliation was conducted every 20 d） were most favorable for growth and regeneration of peony which was compensatory growth.