Minimum temperature and evapotranspiration in Central Amazonian floodplains limit tree growth of Nectandra amazonum (Lauraceae)

Autor(es)

Goncalves, Janaina Quixabeira ^{[1, 2]} ; Durgante, Flavia Machado ^{[1, 3]} ; Wittmann, Florian ^{[1, 2, 3]} ; Piedade, Maria Teresa Fernandez ^{[1, 2]} ; Ortega Rodriguez, Daigard Ricardo ^[4] ; Tomazello-Filho, Mario ^[4] ; Parolin, Pia ^[5] ; Schongart, Jochen ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Natl Inst Amazon Res, Ecol Monitoring & Sustainable Use Wetlands MAUA R, Av Andre Araujo 2936, BR-69067375 Manaus, Amazonas - Brazil

^[2] Natl Inst Amazon Res, Grad Program Ecol, Manaus, Amazonas - Brazil

^[3] Karlsruhe Inst Technol, Inst Geog & Geoecol, Dept Wetland Ecol, Josefstr 1, D-76437 Karlsruhe - Germany

^[4] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Forest Sci, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[5] Univ Hamburg, Dept Biodivers Evolut & Ecol Plants, Bioctr Klein Flottbek, Ohnhorststr 18, D-22609 Hamburg - Germany

• Tipo de documento: Artigo Científico
• Fonte: TREES-STRUCTURE AND FUNCTION; v. 35, n. 4, p. 1367-1384, AUG 2021.
• Citações Web of Science: 0

Resumo

Key message Tree growth of Nectandra amazonum (Lauraceae) in the Central Amazonian floodplains does not respond to the annual long-term flooding but responds to variation of minimum temperature and potential evapotranspiration. During the last two decades, the Central Amazon region has been impacted by increasingly frequent and more severe floods and droughts and increasing temperature. Little is known about the effects of these climate trends on tree growth in floodplain forests. In this study, we analysed Nectandra amazonum (Lauraceae), an evergreen and flood-adapted tree species, dominant not only in the nutrient-rich Amazonian floodplains (varzea), but also occurring in other environments within and outside the Amazon basin. For the period from 2001 to 2017, intra- and interannual climate-growth relationships of N. amazonum were analysed applying a combination of conventional dendrochronological (cross-dating) and densiometric techniques to construct a robust tree-ring chronology. Six wood parameters were derived from the chronology (ring width, width of earlywood and latewood and corresponding wood density values) and correlated with local climate and hydrologic data. The analysed 32 trees did not show correlation between wood parameters and variation of the hydrological regime. Climate-growth relationships indicated that potential evapotranspiration and minimum temperature play an important role in tree growth mainly during the period of transition between the dry and the wet seasons, and during the aquatic phase affecting physiological processes such as photosynthesis and respiration, respectively. We discuss these results in the background of changing hydroclimatic conditions induced by climate and land-use change in the Amazon basin. Based on our findings, we emphasize the need for more dendroclimatic studies in the tropics applying a multiproxy approach. This will deepen our understanding of tree growth responses, helping to elucidate the dynamic processes of tropical forests that grow under global change impacts. (AU)

• Processo FAPESP: 18/22914-8 - Mudanças climáticas globais na floresta tropical amazônica avaliadas por multi-indicadores dendrocronológicos
• Beneficiário: Daigard Ricardo Ortega Rodriguez
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/50085-3 - PIRE: educação e pesquisa em clima das Américas usando os exemplos de anéis de árvores e espeleotemas (PIRE-CREATE)
• Beneficiário: Francisco William da Cruz Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/53951-7 - EMU: implantação de laboratório multiusuário especializado em métodos de espectroscopia de infravermelho próximo (NIR) e de densitometria de raios X em aplicações agro-florestais
• Beneficiário: Mario Tommasiello Filho
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários