Biometric data of arboreal individuals from ecotonal forests in eastern Maracá Island, northern Brazilian Amazonia

The database provides information on stem measurements of arboreal individuals (tree + palm) from ecotonal forests in eastern Maracá Ecological Station, a federal environmental protected area formed by Maracá Island and small islets in the Rio Uraricoera, State of Roraima, northern Brazilian Amazonia. 129 permanent plots (10 x 50 m each) were established along the six East-West grid trails of the Biodiversity Research Program (PPBio). All arboreal individuals with stem diameter ≥ 10 cm present in the plots were marked with numbered aluminum tags which were fixed by galvanized nails. Diameter measurements were performed using a diameter tape (model 283D / 5m). The dataset is available in a file xlsm showing the identification and geographical location of the sampling units (plots), year of each census (date), identification code of each arboreal individuals, point of measured (POM in mm), stem diameter (cm) and taxonomic group (tree or palm). 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.S. and H.L.S.F. were supported by postgraduate fellowships 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.B. (Proc. CNPq 304204/2015-3), while C.D.A.V. was supported by postgraduate fellowship from the Organization of American States (OAS).

本数据库收录了巴西亚马孙北部罗赖马州乌拉里科埃拉河（Rio Uraricoera）流域内，由马拉卡岛及小型岛屿构成的联邦级环保保护区——马拉卡生态站（Maracá Ecological Station）交错带森林的木本个体（乔木+棕榈）茎干测量数据。研究团队沿生物多样性研究计划（Biodiversity Research Program，PPBio）的6条东西向网格步道，共设立129个永久样地，单个样地规格为10×50米。所有样地内茎干直径≥10厘米的木本个体，均通过镀锌钉固定带编号的铝制标签完成标记。茎干直径测量采用型号为283D/5米的直径卷尺开展。本数据集存储于xlsm格式文件中，包含采样单元（样地）的标识与地理位置、每次普查的年份（日期）、每株木本个体的识别码、测量点（POM，单位：毫米）、茎干直径（单位：厘米）以及分类群（乔木或棕榈）。本数据集得到项目"罗赖马州交错带森林树木生长与死亡率：环境制约因子与气候变异性的影响"（Proc. CNPq n. 403591/2016-3）资助。W.R.S.与H.L.S.F.获得了长期生态研究计划（PELD Program）的研究生奖学金资助，该计划由CNPq/CAPES/FAPs/BC-牛顿基金支持，资助编号为441575/2016-1。巴西国家科学技术发展委员会（Conselho Nacional de Desenvolvimento Científico e Tecnológico，CNPq）为R.I.B.提供了研究员资助，资助编号为CNPq 304204/2015-3；C.D.A.V.则获得了美洲国家组织（Organization of American States，OAS）的研究生奖学金支持。