C, N and P Stoichiometry of Young Trees in Montane Moist Evergreen Broad-Leaved Forest of Ailao Mountains
Total C, N and P Stoichiometry of different organs in young tree of four dominant species in montane moist evergreen broad-leaved forest of Ailao Mountains was measured to investigate the ecological adaptability and ecological significance.The results show: C contents of young leaf in the canopy species of Castanopsis wattii and Lithocarpus xylocarpus, and subcanopy species of Hartia sinensis and Manglietia insignis are relatively high, 493.0,489.3,467.3 and 487.7 mg · g-1, respectively.C contents of leaf are higher in canopy species than those in sub-canopy species.N and P contents in leaf for four young trees are higher than those in branch, trunk and root, and total N and P contents of leaf in canopy species are higher than those of sub-canopy species.The content ratios of m(C) ∶ m(N) and m(C) ∶ m(P) of leaf for four young trees are 28.9, 30.4, 39.9, 22.4 and 374.3,473.1, 792.1,517.7, respectively, and the ratio of sub-canopy species is obviously higher than that of canopy species.m(N) ∶ m(P) of leaf for four young tree are highest compared with other three organs, and m(N) ∶ m(P) of sub-canopy species is higher than that of canopy species.In conclusion, young tree of two sub-canopy species are influenced more by P, and more for canopy species by N.The canopy species can be in a dominant position in the competitiveness of resources, and sub-canopy species have more advantages in the utilization efficiency of resources.
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