Bündchen Márcia, Boeger Maria Regina T, Reissmann Carlos B, Geronazzo Kelly M
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul (IFRS), Rua Coronel Vicente, 281, Centro, 90030-040 Porto Alegre, RS, Brasil , Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Porto Alegre RS , Brazil.
Programa de Pós-Graduação em Ecologia e Conservação, Setor de Ciências Biológicas, Universidade Federal do Paraná, Caixa Postal 19031, 81531-990 Curitiba, PR, Brasil , Universidade Federal do Paraná, Programa de Pós-Graduação em Ecologia e Conservação, Setor de Ciências Biológicas, Universidade Federal do Paraná, Curitiba PR , Brazil.
An Acad Bras Cienc. 2016;88 Suppl 1:467-77. doi: 10.1590/0001-3765201620140605.
The purpose of this study was to analyze the seasonal variation in the nutrient and pigment content of leaves from five tree species - of which three are perennial (Cupania vernalis, Matayba elaeagnoides and Nectandra lanceolata) and two are deciduous (Cedrela fissilis and Jacaranda micrantha) - in an ecotone between a Deciduous Seasonal Forest and a Mixed Ombrophilous Forest in the state of Santa Catarina, Brazil. Leaf samples were collected in the four seasons of the year to determine the content of macronutrients (N, K, P, Mg, Ca, S) and photosynthetic pigments (Chla, Chlb, Chltot, Cartot, Chla:Chlb and Cartot:Chltot). The principal component analysis showed that leaf pigments contributed to the formation of the first axis, which explains most of the data variance for all species, while leaf nutrient contribution showed strong interspecific variation. These results demonstrate that the studied species have different strategies for acquisition and use of mineral resources and acclimation to light, which are determinant for them to coexist in the forest environment.
本研究的目的是分析巴西南大河州落叶季节性森林和混合雨林交错带中五种树木叶片养分和色素含量的季节变化，其中三种是多年生植物（春季番荔枝、油榄仁叶马塔依巴和披针叶楠），两种是落叶植物（裂叶香椿和蓝花楹）。在一年的四个季节采集叶片样本，以测定大量营养素（氮、钾、磷、镁、钙、硫）和光合色素（叶绿素a、叶绿素b、总叶绿素、类胡萝卜素总量、叶绿素a:叶绿素b和类胡萝卜素总量:总叶绿素）的含量。主成分分析表明，叶片色素对第一轴的形成有贡献，该轴解释了所有物种的大部分数据方差，而叶片养分的贡献则表现出强烈的种间差异。这些结果表明，所研究的物种在获取和利用矿物质资源以及适应光照方面有不同的策略，这些策略是它们在森林环境中共存的决定性因素。
