Latitude gradient changes on herbaceous biomass and leaf N and P stoichiometry characteristics in Loess Plateau Seasonal variations of leaf nitrogen and phosphorus stoichiometry of three herbaceous species in Hangzhou Bay coastal wetlands, China Leaf N and P Stoichiometry of common species in successional stages of the evergreen broad-leaved forest in Tiantong National Forest Park, Zhejiang Province, China Short-term effects of warming on growth and stoichiometrical characteristics of Abies fabiri (Mast.) Craib seedling in Gongga mountain Seasonal variations in leaf C, N, and P stoichiometry of typical plants in the Yangou watershed in the loess hilly gully region