1
artículo
Publicado 2010
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O presente trabalho trata do estudo da dendrologia, distribuição geográfica e status de conservação de plantas de U. guianensis (Aubl.) J.F. Gmel. e U. tomentosa (Willd. ex Roem. & Schult.) DC. de interesse medicinal, com ocorrência no Estado do Acre, Brasil. A pesquisa consistiu na coleta de material botânico, levantamento e estudo das exsicatas de herbários do Brasil e outros países da América do Sul, complementada pela revisão bibliográfica das espécies na literatura e nos sítios especializados. São apresentadas as descrições morfológicas, ilustrações, mapeamento dos espécimes e a determinação da situação populacional das duas espécies.
2
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Publicado 2019
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In Brazil, most Eucalyptus plantations are located in regions experiencing periods of water shortage where fertilizers are intensively used to achieve high productivity. Fertilization can affect water use. However, the effects of fertilization on tree growth patterns during extreme droughts periods remain unknown. A throughfall exclusion experiment was set up in Sao Paulo State-Brazil to study the effects of potassium (K) and sodium (Na) fertilization and their interaction with water supply in the growth of Eucalyptus grandis trees over an abnormal season of 6 months of extreme drought in comparison with that in normal seasons, as well as the differences in responsiveness to intra-annual meteorological variability. Arranged in a split-plot design, the factors were water supply (37% throughfall exclusion vs. no throughfall exclusion) and fertilization regime (K, Na, and control). Basal ar...
3
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Publicado 2023
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Wood is a heterogenous material whose properties vary over time, making it difficult to predict the wood properties at a given age of trees in the future. The site and climate are also factors affecting wood heterogeneity. To improve the accuracy of early selection of trees in drier sites, it is thus important to study inter-annual variations in wood density in conditions of contrasting water availability. We tested the use of near-infrared hyperspectral imaging (NIR-HSI) to assess inter-annual wood density and predict wood density at a future age to evaluate the accuracy of early selection of Eucalyptus grandis trees for wood density and to see if a drier site influences early selection. We sampled 38 six-year-old trees growing under two different water regimes: (i) 37% throughfall reduction (–W), to simulate a dry site, and (ii) undisturbed throughfall (+ W). NIR-HSI images were us...
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Publicado 2022
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We gratefully acknowledge Rildo M. Moreira and staff of the Itatinga Research Station (ESALQ/USP) for authorization to conduct the experiment and Eder Araujo da Silva (http://www.floragroapoio.com.br) for technical support in the installation of the throughfall exclusion device and growth monitoring. We also thank Dr. Juan Sinforiano Delgado Rojas for support in installing, maintaining, and reading the automatic dendrometers. This research was funded by the Agropolis Foundation under reference ID1203-003 through the ?Investissements d'avenir? program (LabexAgro/ANR-10-LABX-0001-01), Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) (444793/2014-3), and Fondo Nacional de Desarrollo Cient?fico, Tecnol?gico y de Innovaci?n Tecnologica (FONDECYT-CONCYTEC, Per?) (Award Number 239-2018). Roger Chambi- Legoas was supported by a scholarship from FONDECYT-CONCYTEC (Award Number...
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Publicado 2021
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This research was supported by the Project Concytec – Banco Mundial, through its executing unit is the Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica (FONDECYT) (Project No. 043-2019-FONDECYT- BMINC.INV). A special thanks to the entire team of the research project “MaderApp: Un aplicativo móvil para el reconocimiento automático y en tiempo real de especies maderables comerciales para combatir la tala ilegal en Selva Central, Perú”.
6
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Publicado 2025
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1. Woody biomass in tropical trees contributes significantly to global carbon stocks; however, these stocks are increasingly affected by climate and land-use changes. Understanding the growth mechanisms driving woody biomass production is essential for assessing the short- and long-term contributions to carbon stocks and dynamics in tropical forests. 2. Trees accumulate biomass by increasing their size (wood volume) and/or tissue density (wood density). However, estimates of tree biomass production are often based solely on size increment through measurements of stem diameter growth, overlooking the potential spatial and temporal variation in wood density within trees. Tree-ring analysis can be applied to reconstruct past tree volume-growth and wood-density variations, allowing the quantification of their relative contributions when reconstructing past woody biomass production. 3. Here, ...
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We acknowledge financial support to the co-authors Peru ‘s CONCYTEC and World Bank (043-2019-FONDECYT-BM-INC.INV.) to J.G.I, among others.
