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    Leaf nutrient concentrations associated with phylogeny, leaf habit and soil chemistry in tropical karst seasonal rainforest tree species

     

    论文题目

    Leaf nutrient concentrations associated with phylogeny, leaf habit and soil chemistry in tropical karst seasonal rainforest tree species

    作    者

    KundongBai & ShihongLv& ShijiangNing & Danjuan Zeng & YiliGuo& BinWang

    发表期刊

    plant and soil

    //

    2018

    摘    要

    Background and aims Leaf nutrient concentrations are predictors of plant growth variation and crucial for biogeochemical cycling.We aimed to explore thee ffects of phylogeny, leaf habit and soil chemistry on leaf nutrient concentrations in tropical karst environments. Methods We sampled top-soils and leaves of co-existing evergreen and deciduous tree species along the continuum of mountain valley, slope and peak in a tropical karst seasonal rainforest. We used phylogenetic comparative methods to determine how leaf nutrient concentrations varied in response to phylogeny, leaf habit and soil chemistry and interacted with each other. Results Tree species had large inter-and intra-nutrient variability and were characterized by the combination of P limitation and Ca hyperaccumulation in leaves. The phylogenetic signals in leaf nutrient concentrations were not significant but increased with decreasing evolution¬ary rates asa result of the best fitted evolutionary pro-cess,i.e.,stabilizing selection towards an optimum value. Compared with deciduous species, evergreen species had lower nutrient concentration requirements to fulfill

     


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