Seasonal Changes of Carbon,Nitrogen,Phosphorus and Soluble Sugar Concentrations in Plant of 'Fengdan'(Paeonia ostii) Chronosequence

【Objective】 'Fengdan'(Paeonia ostii) is a new woody oil crop. It is not clear about the carbon,nitrogen,and phosphorus stoichiometry and source-sink structure in this plant species. This study compared the seasonal variations of C,N,P,and soluble sugar concentrations and allocations,as well as the ratios of C ∶N,C ∶P and N ∶P in different organs of 'Fengdan'in an annual cycle at different stages of development,in order to lay a foundation for the analysis of its yield composition and provide a guidance for the cultivation and management of oil peony. 【Method】A destructive strategy was applied to sample roots,stems,leaves,flowers and fruits of 4-,6-,and 8-year-old plants from Tongling peony garden in Anhui Province at the stage of bud dormancy,flowering,fruit mature,and defoliation. The dynamic changes of C,N,P and soluble sugar concentrations in those samples were measured,and then the allocation and stoichiometry dynamics were analyzed.【Result】The results showed that: 1) all organs had a similar seasonal dyn