Nitrogen and phosphorus uptake dynamics in anthropized and conserved Caatinga dry forests.
2024
SILVA, E. C. A. | LEITE, J. | ALVES, M. C. J. L. | SANTOS, C. M. DOS | DAIBES, L. F. | FERNANDES JUNIOR, P. I. | MOURA, F. DE B. P. | SILVA, J. V. DA | ELIZABETE CRISTINA ARAÚJO SILVA, UNIVERSIDADE FEDERAL DE ALAGOAS | JAKSON LEITE, INSTITUTO FEDERAL DE EDUCAÇÃO, CIÊNCIA E TECNOLOGIA DO PARÁ | MARIA CLAUDJANE JERÔNIMO LEITE ALVES, UNIVERSIDADE FEDERAL DE ALAGOAS | CLAUDIANA MOURA DOS SANTOS, UNIVERSIDADE FEDERAL DE ALAGOAS | LUÍS FELIPE DAIBES, UNIVERSIDADE ESTADUAL PAULISTA | PAULO IVAN FERNANDES JUNIOR, CPATSA | FLÁVIA DE BARROS PRADO MOURA, UNIVERSIDADE FEDERAL DE ALAGOAS | JOSÉ VIEIRA DA SILVA, UNIVERSIDADE FEDERAL DE ALAGOAS.
Understanding human impacts on drylands is crucial in a global scenario of forest degradation and biodiversity loss. This study analyzed foliar concentrations of nitrogen (N) and phosphorous (P) in the Brazilian seasonally dry tropical forests (Caatinga). Foliar patterns of N, P, and the N/P ratio were assessed both within and among botanical families. To do this, 10 plots were established in an anthropized area and 10 in a conserved area. Within each plot, leaves from all tree species and soil samples from four random points were collected. Stoi-chiometric analyses were performed on the leaves of 136 trees from 14 botanical families. Significant differences were observed in soil P concentrations, organic matter content, and cation exchange capacity, with the highest values found in the conserved area. Foliar N and P concentrations and N/P were also higher in the conserved area for the F+ (nitrogen-fixing Fabaceae), F- (non-nitrogen-fixing Fabaceae), and NF (non-Fabaceae) groups, indicating greater efficiency in nutrient retention and cycling. When comparing species found in both areas, Aspidosperma pyrifolium (NF), Bauhinia forficata (F-), and Mimosa ophthalmocentra (F+) showed significant differences in foliar N concentrations and foliar P (for A. pyrifolium and B. forficata only). Degradation of the Caatinga directly impacts nutrient cycling.
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