Data/hora: 28/05/2024 16:05:08

Biblioteca(s): 	Embrapa Agrobiologia.	
Data corrente: 	29/04/2020	
Data da última atualização: 	08/01/2021	
Autoria: 	ALEIXO, S.; GAMA-RODRIGUES, A. C.; GAMA-RODRIGUES, E. F.; CAMPELLO, E. F. C.; SILVA, E. C.; SCHRIPSEMA, J.	
Afiliação: 	UENF; UENF; UENF; EDUARDO FRANCIA CARNEIRO CAMPELLO, CNPAB; UENF; UENF.	
Título: 	Can soil phosphorus availability in tropical forest systems be increased by nitrogen-fixing leguminous trees?	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Science of the Total Environment, v. 712, e136405, 2020.	
Idioma: 	Inglês	
Conteúdo: 	Understanding the role of N-fixing leguminous trees for phosphorus (P) cycling in highly weathered tropical soils is relevant for the conservation of natural forests as well as the sustainable management of agroforests and forest plantations with low P input in the Brazilian Atlantic Forest region. We hypothesized that N-fixing leguminous trees can increase the availability of soil P by exploiting different P sources without causing a depletion of soil organic P due to efficient biogeochemical cycling, but empirical evidence remains scarce. For this purpose, P-31 nuclear magnetic resonance spectroscopy (P-31 NMR) was used for quantifying soil P forms and the Hedley sequential extraction to determine soil P fractions. The studied sites were forestry systems with leguminous trees: mixed forest plantations with different proportions of fast-growing N-fixing leguminous trees; pure plantations, and agroforestry systems with leguminous trees The results show that all N-fixing leguminous trees and N mineral fertilization positively affected the concentrations of available soil P in relation to the control treatments. There were increases of all P fractions through cycling in all forest sites. P-31 NMR spectra clearly identified and quantified that a large amount of phosphomonoesters followed by phosphodiesters in the form of DNA, as well as high reserves of P, species (orthu-P and pyrophosphate) in the first eleven years of growth at pure plantations, mixed plantations or agroforests. The relations between both orthu-P and DNA with the resin-P-i, NaHCO3-P-i, and NaOH-P-i, fractions suggest that both analysis methods provide complementary information about the soil P transformations. Thus, the paper highlights the importance of the use of different N-fixing leguminous tree species under different environmental conditions, production systems and management practices for recovering heavily degraded areas, which may be a suitable strategy through efficient management of P in highly weathered tropical soils in the Brazilian Atlantic Forest biome. (C) 2020 Elsevier B.V. All rights reserved.	
Palavras-Chave: 	Atlantic Forest; N fixing leguminous trees; Sequential extraction method; Soil organic phosphorus.	
Categoria do assunto: 	K Ciência Florestal e Produtos de Origem Vegetal	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (41378-1) - UPC - AP - DD -  -  -  - DIS