Reconstruction of annual tree-ring growth and chemistry of long-lived tree species as a proxy climate record in the Amazonian forest

• Grant number: 20/04608-7
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Effective date (Start): April 10, 2021
• Effective date (End): April 04, 2022
• Field of knowledge: Agronomical Sciences - Forestry Resources and Forestry Engineering - Forest Management
• Principal Investigator: Mario Tommasiello Filho
• Grantee: Daigard Ricardo Ortega Rodriguez
• Supervisor: Raúl Sánchez Salguero
• Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
• Research place: Universidad Pablo de Olavide (UPO), Spain
• Associated to the scholarship: 18/22914-8 - Global climate change in the Amazon tropical forest assessed by dendrocronological multi-proxy, BP.DR

Abstract

Chemical elements are allocated and translocated during the growth process through cambium activity and ring formation as part of tree metabolism and physiology. This process is also regulated by genetic expression, tree age and environmental conditions. The evaluation of anatomical and chemical parameters of tree-rings are therefore currently considered a crucial source of data in tree functioning and proxy of climate records. In the Tropics, analysis of tree-rings (dendrochronology) and construction of long-term chronologies are often precluded by the difficulty of reaching a significant sampling and identifying the annuity of the rings. Furthermore, analysis of chemical features of annually resolved rings (dendrochemistry) is scarce due to the lack of knowledge of analytical methods, instruments, and functionality and characteristics of elements in tropical trees. Thus, the aims of this project are: i) Perform a non-destructive method for Dendrochemistry study by applying X-ray fluorescence (XRF) microanalysis to wood samples of long-live tropical trees; ii) determine the intra- and inter-annual elements distribution and investigate their functionality in tree growth process; iii) built annually long-term chronologies of chemical elements to complement ring-width and density data in climate sensitivity analysis. For this purpose, we will use a high resolution XRF multiscanner, Itrax, designed for the analysis and data processing of wood samples. This proposal is a collaboration with the Assistant Professor Dr. Raúl Sánchez-Salguero and the postdoctoral researcher Dra. Andrea Hevia Cabal in Department of Physical, Chemical and Natural Systems of Universidad Pablo de Olavide (Sevilla, Spain). (AU)