Abstract
For the recovery of a degraded area to occur in a satisfactory way, it is essential to elucidate the ecology of native tree species. This study aimed to evaluate the morpho-anatomical response of P. lambertii after 18 months of deployment in different conditions of light, considering as a factor of change areas with different degrees of succession on margins of the Iraí Reservoir, at the time of establishment of the experiment. For this, aspects of morphology (leaf area, dry weight, specific leaf area, stomatal density), anatomy (thickness of cuticle, adaxial epidermis, palisade parenchyma, transfusion parenchyma, spongy parenchyma, abaxial epidermis and total thickness) and development (height, diameter and survival) were evaluated. The results showed that P. lambertii made a significant difference to the leaf area, being higher for individuals of regenerating forestry. For the stomatal density, cuticle thickness, palisade and spongy parenchyma, total thickness, height and diameter were significantly higher for individuals in the open field. The rate of survival was similar for both areas. Thus, P. lambertii under the conditions of this study has proved itself able to adapt to conditions that have either greater or lesser availability of irradiance. However, it presents a more satisfactory development in conditions of intermediate light.
Highlights
É fato que as atividades antrópicas promoveram a destruição dos recursos naturais
The results showed that P. lambertii made a significant difference to the leaf area, being higher for individuals of regenerating forestry
P. lambertii under the conditions of this study has proved itself able to adapt to conditions that have either greater or lesser availability of irradiance
Summary
As amostras foliares foram obtidas num plantio realizado nas margens do Reservatório do Iraí, situado entre os municípios de Pinhais, Piraquara e Quatro Barras, no Estado do Paraná. Foi de 576, 288, 144, 144 e 48, respectivamente para M. scabrella, S. terebinthifolius, P. lambertii, L. divaricata e E. montevidensis, totalizando 1.200 indivíduos para a área total avaliada. Em agosto de 2007 (mudas com 18 meses de campo), foi realizada a coleta das folhas de P. lambertii para a análise da morfologia foliar. Para a contagem dos estômatos, a superfície da região mediana de três folhas de cada indivíduo (90 amostras) por estádio sucessional foi modelada com esmalte de unha incolor. No momento da coleta das folhas foi feita a caracterização lumínica das áreas com o auxílio de um analisador portátil de fotossíntese (Portable Photosynthesis System, modelo LC pró+, Dynamax, USA), utilizando dados da taxa fotossinteticamente ativa (PAR), caracterizando a área aberta com 1387,53mmol/ m2/s e a área de capoeira com 935,27mmol/m2/s. Para a análise dos tratamentos foi utilizado Teste t para comparar as médias das características morfológicas ao nível de 5% de probabilidade com o auxílio do programa STATISTICA versão 6.0
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