title: [C, N and P stoichiometric characteristics of different root orders for three dominant tree species in subalpine forests of western Sichuan, China].
abstract: Fine root order was classified according to Pregitzer's method. This study measured carbon (C), nitrogen (N) and phosphorus (P) concentrations of the 1-5 root orders (diameter < 2 mm) in three dominant subalpine tree species (Betula albosinensis, Abies faxoniana and Picea asperata) of western Sichuan. Their stoichiometric ratios of different root orders were also calculated. The results showed that C concentration, C/N and C/P increased, but N and P concentrations decreased from the first to fifth order of fine root for all tree species. No significant changes in N/P among root orders were detected in each species. There were significant differences in C, N, P concentrations and their stoichiometric ratios among the tree species. The species-associated differences were dependent on root order. There were significant correlations between C, N, P concentrations and their stoichiometric ratios in the three tree species.
authors.forename: Shi-shan
authors.initials: SS
authors.lastname: Tang
authors.forename: Wan-qin
authors.initials: WQ
authors.lastname: Yang
authors.forename: Li
authors.initials: L
authors.lastname: Xiong
authors.forename: Rui
authors.initials: R
authors.lastname: Yin
authors.forename: Hai-peng
authors.initials: HP
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhen-feng
authors.initials: ZF
authors.lastname: Xu
mesh_terms: D028202:Abies; D029662:Betula; D002244:Carbon / Q000032:analysis*; D002681:China; D065928:Forests; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D028222:Picea; D018517:Plant Roots / Q000737:chemistry*; D014197:Trees
chemical_list: D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen