Growth Assessment of Native Tree Species from the Southwestern Brazilian Amazonia by Post-AD 1950 C-14 Analysis: Implications for Tropical Dendroclimatology Studies and Atmospheric C-14 Reconstructions

Author(s)

Santos, Guaciara M. ^[1] ; Ortega Rodriguez, Daigard Ricardo ^[2] ; Barreto, Nathan de Oliveira ^[2] ; Assis-Pereira, Gabriel ^[2] ; Barbosa, Ana Carolina ^[3] ; Roig, Fidel A. ^{[4, 5]} ; Tomazello-Filho, Mario ^[2]

Affiliation

^[1] Univ Calif Irvine, Earth Syst Sci Dept, B321 Croul Hall, Irvine, CA 92697 - USA

^[2] Univ Sao Paulo, Dept Ciencias Florestais, Escola Super Agr Luiz de Queiroz, BR-13418900 Piracicaba - Brazil

^[3] Univ Fed Lavras, Dept Ciencias Florestais, CP 3037, BR-37200900 Lavras - Brazil

^[4] Univ Nacl Cuyo, Argentine Inst Nivol Glaciol & Environm Sci IANIG, CONICET, RA-5500 Mendoza - Argentina

^[5] Univ Mayor, Fac Ciencias, Hemera Ctr Observac Tierra, Escuela Ingn Forestal, Santiago 8580745 - Chile

• Document type: Journal article
• Source: FORESTS; v. 12, n. 9 SEP 2021.
• Web of Science Citations: 0

Abstract

Tree-ring width chronologies of cedro (Cedrela fissilis Vell.) (1875 to 2018), jatoba (Hymenaea courbaril L.) (1840 to 2018) and roxinho Peltogyne paniculata Benth.) (1910 to 2018) were developed by dendrochronological techniques in the southern Amazon Basin. Acceptable statistics for the tree-ring chronologies were obtained, and annual calendar dates were assigned. Due to the lack of long-term chronologies for use in paleoclimate reconstructions in degraded forest areas, dendrochronological dating was validated by C-14 analysis. Tree-rings selected for analysis corresponded to 1957, 1958, 1962, 1963, 1965, 1971, and 1972. Those are critical calendar years in which atmospheric C-14 changes were the highest, and therefore their tree-ring cellulose extracts C-14 signatures when in alignment with existing post-AD 1950 atmospheric C-14 atmospheric curves would indicate annual periodicity. Throughout our correlated calendar years and post-AD 1950 C-14 signatures, we indicate that H. courbaril shows an erratic sequence of wood ages. The other two tree species, C. fissilis and P. paniculata, are annual in nature and can be used successfully as paleoclimate proxies. Moreover, due to the sampling site's strategic location in relation to the Tropical Low-Pressure Belt over South America, these trees can be used to enhance the limited amount of observational data in Southern Hemisphere atmospheric C-14 calibration curves. (AU)

• FAPESP's process: 18/22914-8 - Global climate change in the Amazon tropical forest assessed by dendrocronological multi-proxy
• Grantee: Daigard Ricardo Ortega Rodriguez
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/26350-4 - Dendrochronology applied to tree management of Peltogyne paniculata Benth. (Roxinho) occurring in Flona Jamari
• Grantee: Nathan de Oliveira Barreto
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 09/53951-7 - Set up of a Multi-User Laboratory specializing in the use of near-infrared spectroscopy and X-ray densitometry in agroforestry applications
• Grantee: Mario Tommasiello Filho
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 17/50085-3 - PIRE: climate research education in the Americas using tree-ring speleothem examples (PIRE-CREATE)
• Grantee: Francisco William da Cruz Junior
• Support Opportunities: Research Projects - Thematic Grants