Nutrient concentrations of 17-year-old Pinus taeda annual tree-rings analyzed by X-ray fluorescence microanalysis

Autor(es)

Ortega Rodriguez, Daigard Ricardo ^[1] ; Pereira de Carvalho, Hudson Wallace ^[2] ; Tomazello-Filho, Mario ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Forest Resource, Av Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo, Ctr Nucl Energy Agr, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: DENDROCHRONOLOGIA; v. 52, p. 67-79, DEC 2018.
• Citações Web of Science: 2

Resumo

Tree-rings are sensitive indicators of soil chemical changes. X-ray fluorescence microanalysis (mu-XRF) can reveal the elemental distribution pattern along these rings. However, reports on quantitative mu-XRF methods targeted to wood analysis are scarce. This study aimed to analyze iron (Fe), manganese (Mn), calcium (Ca), potassium (K), sulfur (S) and phosphorus (P) in annual tree-rings of wood cores cut from 24 trees of 17 year-old Pinus taeda planted in soil amended with six doses of composted pulp-mill sludge (CPMS). The nutrient concentrations were accessed using calibration curves built with spiked P. taeda wood pellets. Calcium and Mn content decreased from the pith to bark direction; K and S decreased from the pith up to 3rd tree-ring and, then, increased to the bark. Iron and P slight decreased from the pith up to the 13-14th tree-ring. Calcium, K and S presented strong and positive correlation with the rainier and hotter season (r > 0.4, p < 0.05). The CPMS increased the Ca, K, Fe and S and decreased Mn and P concentration in P. taeda wood in the 2nd-5th years. Furthermore, the P. taeda annual tree-ring molar ratios of Ca/Mn and K/Ca were good indicators of soil-pH and wood cambium activity. The mu-XRF methodology, as non-destructive method of nutrient concentration analysis in tree-rings, revealed potential uses in monitoring soil fertilizer treatments. (AU)

• Processo FAPESP: 15/19121-8 - EMU concedido no processo 2015/05942-0: sistema de microfluorescência de Raios X
• Beneficiário: Hudson Wallace Pereira de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 15/05942-0 - Investigação do metabolismo de nanomateriais absorvidos por plantas empregando-se espectroscopias vibracional e de Raios X
• Beneficiário: Hudson Wallace Pereira de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores