Title:	Seasonal dynamics of chemical soil properties under native Brazil-nut (Bertholletia Excelsa) groves in the Tapajós National Forest, brazilian Amazon.
Authors:	OLIVEIRA JUNIOR, R. C. de MOURA, Q. L. de COSTA, P. da MELEM JUNIOR, N. J. GUEDES, M. C. SANTOS, D. B. dos MORAES, B. L. T. de MOTA, A. F. L.
Affiliation:	RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; QUÊZIA LEANDRO DE MOURA, UNIVERSIDADE FEDERAL RURAL DA AMAZÔNIA; PATRICIA DA COSTA, CNPMA; NAGIB JORGE MELEM JUNIOR, CPAF-AP; MARCELINO CARNEIRO GUEDES, CPAF-AP; DARLISSON BENTES DOS SANTOS; BRENDA LOHANA TEIXEIRA DE MORAES, SELO VERDE AMBIENTAL; AMANDA FABRÍCIA LEÃO MOTA, SECRETARIA DE ESTADO DE MEIO AMBIENTE E SUSTENTABILIDADE DO PARÁ.
Date Issued:	2026
Citation:	Caderno Pedagógico, v. 23, n. 1, e22983, 2026.
Description:	Seasonal fluctuations in soil chemical properties play a central role in regulating biogeochemical processes and fertility in Amazonian forests. This study evaluated how rainy and dry seasons influence soil organic carbon (C), total nitrogen (N), and pH under native Bertholletia excelsa groves in the Tapajós National Forest, Pará, Brazil. Thirty soil samples (0–20 cm) were collected during each season and analyzed individually using standardized laboratory procedures and appropriate statistical tests. Significant seasonal differences were detected for C (p = 0.0001) and N (p = 0.013), whereas pH remained stable across periods (p > 0.05). Organic carbon increased markedly during the dry season, reflecting the accumulation of partially decomposed litter and humic substances under reduced moisture and slower decomposition. In contrast, total nitrogen decreased slightly but significantly, suggesting enhanced microbial immobilization during drought. Together, these patterns indicate that hydrological seasonality modulates the balance between nutrient release in the wet season and organic matter preservation in the dry season. From a management perspective, maintaining litter cover and minimizing soil disturbance during the dry season are essential to sustaining nutrient retention, soil structure, and ecosystem resilience. By integrating seasonal contrasts in C, N, and pH, this study provides empirical evidence of the mechanisms governing nutrient dynamics in soils beneath native Brazil-nut trees, advancing the understanding of biogeochemical functioning and offering a basis for sustainable management of Amazonian extractive systems.
Thesagro:	Solo Química do Solo Nitrogênio Carbono Bertholletia Excelsa Floresta Tropical
Keywords:	Sazonalidade Floresta Amazonia Carbono organico Nitrogênio total Ciclagem biogeoquímica
DOI:	https://doi.org/10.54033/cadpedv23n1-216
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATU)