Leafing Patterns and Drivers across Seasonally Dry Tropical Communities

Autor(es)

Alberton, Bruna ^[1] ; Torres, Ricardo da Silva ^[2] ; Sanna Freire Silva, Thiago ^[3] ; da Rocha, Humberto R. ^[4] ; Moura, Magna S. B. ^[5] ; Morellato, Leonor Patricia Cerdeira ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Unesp, Inst Biociencias, Lab Fenol, BR-13506900 Rio Claro, SP - Brazil

^[2] Univ Estadual Campinas, Inst Comp, BR-13083852 Campinas, SP - Brazil

^[3] Univ Stirling, Biol & Environm Sci, Stirling FK9 4LA - Scotland

^[4] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508090 Sao Paulo - Brazil

^[5] Embrapa Semiarido, Empresa Brasileira Pesquisa Agr, BR-56302970 Petrolina, PE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: REMOTE SENSING; v. 11, n. 19 OCT 2019.
• Citações Web of Science: 0

Resumo

Investigating the timing of key phenological events across environments with variable seasonality is crucial to understand the drivers of ecosystem dynamics. Leaf production in the tropics is mainly constrained by water and light availability. Identifying the factors regulating leaf phenology patterns allows efficiently forecasting of climate change impacts. We conducted a novel phenological monitoring study across four Neotropical vegetation sites using leaf phenology time series obtained from digital repeated photographs (phenocameras). Seasonality differed among sites, from very seasonally dry climate in the caatinga dry scrubland with an eight-month long dry season to the less restrictive Cerrado vegetation with a six-month dry season. To unravel the main drivers of leaf phenology and understand how they influence seasonal dynamics (represented by the green color channel (Gcc) vegetation index), we applied Generalized Additive Mixed Models (GAMMs) to estimate the growing seasons, using water deficit and day length as covariates. Our results indicated that plant-water relationships are more important in the caatinga, while light (measured as day-length) was more relevant in explaining leafing patterns in Cerrado communities. Leafing behaviors and predictor-response relationships (distinct smooth functions) were more variable at the less seasonal Cerrado sites, suggesting that different life-forms (grasses, herbs, shrubs, and trees) are capable of overcoming drought through specific phenological strategies and associated functional traits, such as deep root systems in trees. (AU)

• Processo FAPESP: 14/00215-0 - Fenologia remota e os padrões de trocas foliares ao longo de um gradiente de sazonalidade
• Beneficiário: Bruna de Costa Alberton
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 09/54208-6 - EMU: Laboratório Multiusuário Centralizado do Núcleo de Estudos em Biodiversidade da UNESP
• Beneficiário: Célio Fernando Baptista Haddad
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 15/50682-6 - Investimentos pró-climáticos inteligentes em bacias de montanhas tropicais da América do Sul (ClimateWise)
• Beneficiário: Humberto Ribeiro da Rocha
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 13/50155-0 - Combining new technologies to monitor phenology from leaves to ecosystems
• Beneficiário: Leonor Patricia Cerdeira Morellato
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - PITE
• 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
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular
• Processo FAPESP: 16/01413-5 - Utilizando a fenologia vegetativa para investigar os controladores de fluxo de energia dos ecossistemas em vegetações tropicais
• Beneficiário: Bruna de Costa Alberton
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado