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C, N and P stoichiometric characteristics of different root orders for three dominant tree species in subalpine forests of western Sichuan, China.

TANG Shi-shan1, YANG Wan-qin1, XIONG Li1, YIN Rui1, WANG Hai-peng2, ZHANG Yan1, XU Zhen-feng1   

  1. (1Sichuan Key Laboratory of Ecological Forestry Engineering, Institute of Ecology & Forestry, Sichuan Agricultural University, Chengdu 611130, China; 2Rice Institute, Sichuan Agricultural University, Chengdu 611130, China)
  • Online:2015-02-18 Published:2015-02-18

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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.