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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Using phenological cameras to track the green up in a cerrado savanna and its on-the-ground validation

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Autor(es):
Alberton, Bruna [1] ; Almeida, Jurandy [2] ; Helm, Raimund [3] ; Torres, Ricardo da S. [4] ; Menzel, Annette [3, 5] ; Cerdeira Morellato, Leonor Patricia [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] UNESP Univ Estadual Paulista, Dept Bot, Phenol Lab, Inst Biociencias, BR-13506900 Rio Claro, SP - Brazil
[2] Fed Univ Sao Paulo UNIFESP, Inst Sci & Technol, BR-12231280 Sao Jose Dos Campos, SP - Brazil
[3] Tech Univ Munich, Ctr Life & Food Sci, D-85354 Freising Weihenstephan - Germany
[4] Univ Campinas UNICAMP, Inst Comp, RECOD Lab, BR-13083852 Campinas, SP - Brazil
[5] Tech Univ Munich, Inst Adv Study, D-85748 Garching - Germany
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: ECOLOGICAL INFORMATICS; v. 19, p. 62-70, JAN 2014.
Citações Web of Science: 35
Resumo

Plant phenology has gained new importance in the context of global change research, stimulating the development of novel technologies for phenological observations. Regular digital cameras have been effectively used as three-channel imaging sensors, providing measures of leaf color change or phenological shifts in plants. We monitored a species rich Brazilian cerrado savanna to assess the reliability of digital images to detect leaf-changing patterns. Analysis was conducted by extracting color information from selected parts of the image named regions of interest (ROIs). We aimed to answer the following questions: (i) Do digital cameras capture leaf changes in cerrado savanna vegetation? (ii) Can we detect differences in phenological changes among species crowns and the cerrado community? (iii) Is the greening pattern detected for each species by digital camera validated by our on-the-ground leafing phenology (direct observation of tree leaf changes)? We analyzed daily sequences of five images per hour, taken from 6:00 to 18:00 h, recorded during the cerrado main leaf flushing season. We defined 24 ROIs in the original digital image, including total or partial regions and crowns of six plant species. Our results indicated that: (i) for the studied period, single plant species ROIs were more sensitive to changes in relative green values than the community ROIs, (ii) three leaf strategies could be depicted from the species' ROI patterns of green color change, and (iii) the greening patterns and leaf functional groups were validated by our on-the-ground phenology. We concluded that digital cameras are reliable tools to monitor high diverse tropical seasonal vegetation and it is sensitive to inter-species differences of leafing patterns. (C) 2014 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 10/52113-5 - E-fenologia: aplicação de novas tecnologias para monitorar a fenologia e mudanças climáticas nos trópicos
Beneficiário:Leonor Patricia Cerdeira Morellato
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
Processo FAPESP: 07/59779-6 - Estudo comparativo da diversidade e da fenologia reprodutiva e vegetativa entre borda e interior num fragmento de Cerrado em Itirapina, São Paulo
Beneficiário:Leonor Patricia Cerdeira Morellato
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 10/51307-0 - Diversidade florística e padrões sazonais dos campos rupestres e cerrado
Beneficiário:Leonor Patricia Cerdeira Morellato
Linha de fomento: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE