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The aim of this work was to analyze the concentration of N, P, K, Ca and Mg in mature and litter leaves and nutrient mobilization in leaves of different tree species from secondary forests of the Atlantic Forest. At the study site, located in Floresta do Palmito (Paranaguá, PR), three different forest typologies namely Initial, Intermediary and Advanced were selected. The predominant sequence of nutrients in litter leaves was: N > Ca > Mg > K > P. This sequence was very similar to that found for mature leaves, the difference being only the change in order between Mg and K. Nutrients mobilized in leaves were higher in the typology Advanced compared to the typology Initial, mainly N, P and K. The majority of the species studied did not mobilize Ca to other parts of the plant, except Clusia criuva (typology Intermediary) and Ocotea pulchella (typology Advanced). O objetivo do presente trabalho foi analisar a concentração de N, P, K, Ca e Mg nas folhas maduras e folhas de serapilheira e mobilização destes elementos nas folhas de diferentes espécies arbóreas de florestas secundárias da Mata Atlântica. A área de estudo localiza-se na Floresta do Palmito (Paranaguá, PR), onde foram selecionadas três tipologias florestais, com diferentes idades e estruturas, denominadas tipologia Inicial, tipologia Intermediária e tipologia Avançada. A seqüência predominante de nutrientes nas folhas de serapilheira foi: N > Ca > Mg > K > P. Esta seqüência foi muito similar nas folhas maduras, sendo a única diferença a mudança de ordem entre o Mg e o K. Os nutrientes mobilizados foram maiores na tipologia Avançada em relação à tipologia Inicial, principalmente no caso do N, P e K. A maioria das espécies estudadas não mobilizou Ca para outras partes da planta, exceto no caso das espécies Clusia criuva (tipologia Intermediária) e Ocotea pulchella (tipologia Avançada)

Nutrient composition of mature and litter leaves and nutrient mobilization in leaves of tree species from secondary rainforests in the South of Brazil