title: [Characteristics of leaf carbon, nitrogen and phosphorus stoichiometry in relation to plant size of Machilus pauhoi].
abstract: To explore the effects of stand age on variation patterns of leaf C, N, P stoichiometric characteristics of Machilus pauhoi, two stands, i.e., 9 and 13 years old, were selected. The relationships between leaf nutrient contents (C, N and P) and diameters at breast height (DBH) of individual plants were analyzed. The data revealed that the individual variations of seedlings in M. pauhoi stands were strengthened with the stand development. The stand age had significant effects on leaf C, N, P contents and C:N ratio but not on C:P and N: P ratios. Specifically, the mean values of leaf C, N, P contents and N:P ratio in the 9-year-old stand were lower than those in the 13-year-old stand, whereas, inverse pattern of C:N and C:P ratios were found in the two stands. Furthermore, leaf N and P stoichiometry varied significantly within the stand. Specifically, leaf N and P contents, as well as their stoichiometric ratios, linearly correlated with DBH in the 9-year-old stand. On the contrary, leaf N and P stoichiometry showed quadratic correlation in 13-year-old stand (except leaf C:N which linearly correlated with DBH). Lastly, nutrient transfer rates of leaf N and P in the 9-year-old stand were higher than that in 13-year-old stand, and the discrepancies of leaf nutrient transfer strategy between growing and non-growing seasons were caused by the different growth phases and environmental conditions.
authors.forename: Lei-lei
authors.initials: LL
authors.lastname: Zhang
authors.forename: Quan-lin
authors.initials: QL
authors.lastname: Zhong
authors.forename: Dong-liang
authors.initials: DL
authors.lastname: Cheng
authors.forename: Zhong-rui
authors.initials: ZR
authors.lastname: Zhang
authors.forename: Ling
authors.initials: L
authors.lastname: Fei
authors.forename: Chao-bin
authors.initials: CB
authors.lastname: Xu
authors.forename: Li-zhong
authors.initials: LZ
authors.lastname: He
authors.forename: Wei-jun
authors.initials: WJ
authors.lastname: Wang
mesh_terms: D002244:Carbon / Q000737:chemistry*; D017753:Ecosystem; D019770:Lauraceae / Q000737:chemistry / Q000254:growth & development*; D009584:Nitrogen / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D013997:Time Factors
chemical_list: D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen