C:N ratio data for ecotone forest soils in the eastern of Maracá Island, northern Brazilian Amazonia
Description
The dataset provides information on the soil C:N ratio of ecotone forests occurring in Maracá Ecological Station, a federal protected area formed by Maracá Island and small islets on the Uraricoera River, state of Roraima, northern Brazilian Amazonia. Sampling was carried out in the PPBio (Biodiversity Research Program) research grid located in the eastern of Maracá Island. 129 permanent plots (10 x 50 m each) were established along the six East-West grid trail (see grid details at https://ppbio.inpa.gov.br). Soil samples were taken (20 cm in depth) in 30 plots. A fraction of 20 g of each sample was sent to the Laboratório de Espectroscopia de Absorção Atômica da Universidade Federal de Viçosa (Minas Gerais, Brazil) for determination of H (hydrogen), C (carbon) and N (nitrogen) content (%) by the Perkin Elmer Serie II 2400 Elemental Analyzer (ignition method). The dataset is available in a file (data_base_HCN.xlxs) showing the identification of sample units (plotID), location (lat / long WGS84), altitude (m a.s.l.), slope (%), canopy opening (%), HCN contents (%) and carbon-to-nitrogen (C:N) ratio values. This dataset was supported by project “Crescimento e mortalidade de árvores em florestas ecotonais de Roraima: efeito das condicionantes ambientais e da variabilidade climática” (Proc. CNPq n. 403591/2016-3). W. R. Silva was supported by postgraduate fellowship from PELD Program (CNPq/CAPES/FAPs/BC-Fundo Newton; Proc. n. 441575/2016-1), the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq - Brazil) provided a fellowship for R. I. Barbosa (Proc. CNPq 304204/2015-3), and C. D. A. Villacorta was supported by postgraduate fellowship from the Organization of American States (OAS).