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


Autoria(s): Alberton, Bruna; Almeida, Jurandy; Helm, Raimund; Torres, Ricardo da S.; Menzel, Annette; Cerdeira Morellato, Leonor Patricia
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

03/12/2014

03/12/2014

01/01/2014

Resumo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Processo FAPESP: 10/52113-5

Processo FAPESP: 10/51307-0

Processo FAPESP: 07/59779-6

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.

Formato

62-70

Identificador

http://dx.doi.org/10.1016/j.ecoinf.2013.12.011

Ecological Informatics. Amsterdam: Elsevier Science Bv, v. 19, p. 62-70, 2014.

1574-9541

http://hdl.handle.net/11449/112772

10.1016/j.ecoinf.2013.12.011

WOS:000332441100008

Idioma(s)

eng

Publicador

Elsevier B.V.

Relação

Ecological Informatics

Direitos

closedAccess

Palavras-Chave #Leafing #Leaf traits #Cerrado #Data validation #Digital camera #Phenology
Tipo

info:eu-repo/semantics/article