福建漳江口3种红树植物叶与小枝化学计量特征及其影响因素OA

To reveal the stoichiometric characteristics and influencing factors of leaves and twigs of mangrove plants,the contents of carbon(C),nitrogen(N),and phosphorus(P)and the stoichiometric ratios of current-year leaves and twigs of three mangrove species(Kandelia obovata,Avicennia marina,and Aegiceras corniculatum)in Zhangjiang River estuary,Fujian Province,were determined,and their correlations with leaf phenotypic traits and basal diameter were analyzed.The results showed that the mean contents of C,N,and P in leaves of the three mangrove species were 421.91,18.05 and 1.79 g/kg,respectively,and those in twigs were 439.28,9.70 and 1.58 g/kg,respectively.There were significant differences in nutrient contents in organs among different species.The N:P ratio of the mangrove ecosystem in this area was lower than the threshold,indicating that the ecosystem was N-limited.There were significant correlations between the element allocation of organs and leaf phenotypic traits of each tree species,reflecting the nutrient acquisition strategies of mangrove plants.The C:N and C:P of leaves and twigs were significantly negatively correlated with basal diameter,while the N:P of twigs was significantly positively correlated with basal diameter,indicating that the resource allocation of different-sized individuals changed dynamically.There were certain correlations between organs,species,leaf phenotypic traits,basal diameter,and the stoichiometric characteristics of mangrove species.Therefore,it was suggested that the stoichiometric characteristics of the three mangrove species were jointly affected by species,organ type,leaf nutrient acquisition strategy,and individual growth status,and were reflected in the nutrient allocation patterns and phenotypic traits.