Data/hora: 09/06/2024 01:42:40

Provedor de dados: | Acta Botanica Brasilica
País: | Brazil
Título: | Functional antagonism between nitrogen-fixing leguminous trees and calcicole-drought-tolerant trees in the Cerrado
Autores: | Meira-Neto,João Augusto Alves; Tolentino,Gláucia Soares; Silva,Maria Carolina Nunes Alves da; Neri,Andreza Viana; Gastauer,Markus; Magnago,Luiz Fernando Silva; Yuste,Jorge Curiel; Valladares,Fernando.
Data: | 2017-03-01
Ano: | 2017
Palavras-chave: | Aluminum toxicity; Calcicole species; Dry forests; Ecosystem function; Nitrogen fixing; Tropical savanna; Woodlands.
Resumo: | ABSTRACT The Cerrado is the largest savanna of South America and its physiognomy varies from savanna to woodlands. There are two main types of woodlands in the Cerrado: dystrophic woodlands, dominated by N-fixing leguminous trees (LEG), and mesotrophic woodlands dominated by non-leguminous drought-tolerant trees (DRY), which are calcicoles and sensitive to Al3+. The working hypothesis is that LEG and DRY are functional antagonists in terms of the acidification/alkalization processes involving different forms of inorganic nitrogen and pH, Ca2+ and Al3+ in soil. Tree species basal area and soil properties were used to investigate the antagonism between LEG and DRY using generalized linear models. The results suggest that LEG and DRY are antagonists. The LEG were positively associated with Al3+, NO3- and NH4+ content and negatively related to increasing Ca2+ content, whereas the DRY were negatively associated with Al3+, NO3- and NH4+ and positively associated with increasing Ca2+ content. The upper soil layer in plots dominated by LEG species became more acidic and the upper soil layer in plots dominated by DRY species became more alkaline. The results suggest that LEG and DRY are functional antagonists and their preferences for NH4+ or NO3- might influence the way the Cerrado woodland changes.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000100011
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062016abb0380
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.31 n.1 2017
Fonte: | info:eu-repo/semantics/openAccess