Biomass Allocation Pattern of Modules in Ramet Population of Epimedium brevicornum

FENG Tu,LI Yun-xiang,QIAN Bao-ying,YANG Zi-song(Sichuan Provincial Key Laboratory of Environmental Science and Biodiversity Conservation,China West Normal University,Nanchong 637002 China)  

Epimedium.brevicornum has many pharmacological activities proved by clinical application,thus it is a vital species of medicinal plant.It is an herbaceous plant with perennial rhizome and a eurytopic plant in Sichuan,China.The ramet populations of E.brevicornum at vegetative phase(VP) and reproductive phase(RP) have been sampled to study the patterns and dynamics of biomass allocation in the different module populations.The results show that the difference of ramet population biomass between VP and RP is not significant.However,the ratios of biomass allocated to different modules are significantly different.The RMR,SBR and R/C at VP are more than at RP,the LMR and LMF at VP are less than at RP on the contrary.Concerning the reproductive phase,the ratio of biomass allocated to vegetative ramet(VR)(83.93%) is more than that to reproductive ramet(RR)(16.07%).As a crucial organ of sexual reproduction,flower accounts for only 1.45% of the total mass in ramet population and approximately 10.44% in reproductive ramet.The proportions of biomass allocated to different modules decreased in the following order: LMR(50.68%),RMR(32.03%),SBR(15.84%) and FR(1.45%).The larger value of LMR can be helpful for producing of dry matters(such as carbohydrate) by physiological process in leaf organ.The dry matters stored in rhizome are crucial at the vegetative phase.Such a function of rhizome is very useful for plant to overcome the difficulty in growth due to temporal heterogeneity of the environmental resources and ensure the survivability and propagation of ramet population.The results imply that there are strong ability and integration of clonal growth of E.brevicornum,the asexual propagation of clonal growth is the main means of reproduction,and the sexual reproduction plays a secondary role in formation and dispersion of ramet population.

【Key Words】： Epimedium brevicornum module biomass allocation ramet population
【Fund】： 四川省杰出青年学科带头人培养计划项目(04ZQ026-047);; 四川省科技厅应用基础项目(03JY029-021-22)~~
【CateGory Index】： S567.239

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