In situ measurements of carbon and nitrogen distribution and composition, photochemical efficiency and stable isotope ratios in Araucaria angustifolia

Araucaria angustifolia (Bertol.) Kuntze is an indigenous conifer restricted to the southern region of South America. In this on-site field study, we provide a detailed description of the nitrogen compounds and sugars allocated to the different plant compartments in tall adult trees, young trees about 2–3 m tall and small seedlings at its northernmost occurrence in the mountains of Itatiaia (20°25′S; 44°50′W; 2,000 m a.s.l.), SE Brazil. We...