FotossÃntese e caracterÃsticas foliares de Ipà e Jatobà associadas à disponibilidade de recursos / Photosynthesis and leaf traits of ipà and jatobà related to resources availability

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

To understand and to relate plant functioning related to contrasts in resources availability it is necessary to perform studies of leaf traits, which have been proposed as indicators of the ecosystems functioning. Within such perspective, we study adult and young individuals of two representative species of biomes of the Brazilian southeast, in different environmental conditions, selected by the deciduousness of the leaves: Tabebuia impetiginosa (ipÃ-roxo) and Hymeneia coubaril (jatobÃ). We performed evaluations of photosynthetic capacity, nitrogen and phosphorus content, specific leaf area, leaf mass per area and leaf dry matter content. The young plants were submitted to different conditions of radiation (full sun and natural shade). The results pointed that leaf traits varied among species according to the functional group.The temporal patterns of resource availability did not significantly interfered in the leaf responses across functional groups; however spatial patterns of resources availability were more expressive in defining leaf traits. It should be emphasized that this study refers to a preliminary search for information about the complex relationships among leaf traits, functional groups and resource availability and that more efforts should be applied to ameliorate methodologies that are established with species of Brazilian biomes

ASSUNTO(S)

leaf dry matter content nitrogen nitrogÃnio Ãrea foliar especÃfica sazonalidade seasonality matÃria seca foliar investimento de recursos sombreamento shade resources investments ecofisiologia vegetal specific leaf area

ACESSO AO ARTIGO

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