Effect Of Light Regime On Hierarchical Biomass Allocation And Allometry In Hosta Ventricosa

Exploring the plant biomass allocation at different hierarchical level and allometric relationship is of great importance to understand the dynamic change of plant's reproductive process and life-history strategy response to future environmental changes.Field potted plant experiment in this paper,in the control of light intensity conditions(full illumination,85.67% light regime and 45.27% light regime),elucidating the mechanisms that responsible for biomass allocation at different hierarchical level and disentangling the size-dependent and size-independent effect on RA variation by analysis the reproductive threshold ?biomass allocation and size-dependent reproductive allocationat ramet and genet level of Hosta ventricosa in different light regime,the main results were as follows:(1)There is no thresholds at ramet and genet level in full illumination of Hosta ventricosa because of the non-significant difference between fructificative and non-fructificative individuals(P=0.231 at ramet level,P=0.64 at genet level).In the other two treatments,the differences were significant(P<0.01),which means that there is a thresholds.(2)light regimes had significant influence on the biomass allocation of Hosta ventricosa,biomass of ramet and genet in 85.67% regimes were significant bigger than the 45.27% regimes one(P<0.01).Meanwhile,the leaf mass ratio(LMR)was smallest in full illumination treatment while the 45.27% light regime share the biggest one.And a opposite result was found for fruit mass ratio(FMR).(3)Reproductive allocation at ramet and genet level were significant higher in full illumination and 85.67% regimes than the 45.27% regimes one(P<0.05).(4)Under the full illumination and 45.27% light regime treatments in 2017 at genet level,there were no size-dependent relationship between variation of reproductive biomass and individual size which means there are no size-dependent reproductive allocation(2017,full illumination:P=0.054;45.27% light regime:P=0.06);Under the other treatments in 2016 and 2017 at ramet and genet level,size-dependent relationship exist between variation of reproductive biomass andindividual size which means there are size-dependent reproductive allocation(P<0.05).