Title:	Soil organic matter molecular composition shifts driven by forest regrowth or pasture after slash-and-burn of Amazon Forest.
Authors:	LEAL, O. dos A. JIMÉNEZ-MORILLO, N. T. GONZÁLEZ-PÉREZ, J. A. KNICKER, H. COSTA, F. de S. JIMÉNEZ-MORILLO, P. N. CARVALHO JUNIOR, J. A. de SANTOS, J. C. dos DICK, D. P.
Affiliation:	OTÁVIO DOS ANJOS LEAL, INSTITUTE OF BIO AND GESOCIENCE AGROSPHERE; NICASIO T. JIMÉNEZ-MORILLO, UNIVERSIDADE DE ÉVORA /I NSTITUTO DE RECURSOS NATURALES Y AGROBIOLOGÍA DE SEVILLA; JOSÉ A. GONZÁLEZ-PÉREZ, INSTITUTO DE RECURSOS NATURALES Y AGROBIOLOGÍA DE SEVILLA; HEIKE KNICKER, INSTITUTO DE RECURSOS NATURALES Y AGROBIOLOGÍA DE SEVILLA; FALBERNI DE SOUZA COSTA, CPAF-AC; PEDRO N. JIMÉNEZ-MORILLO, UNIVERSIDAD PABLO DE OLAVIDE; JOÃO ANDRADE DE CARVALHO JÚNIOR, UNIVERSIDADE ESTADUAL PAULISTA; JOSÉ CARLOS DOS SANTOS, INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS; DEBORAH PINHEIRO DICK, UNIVESIDADE FEDERAL DO RIO GRANDE DO SUL.
Date Issued:	2023
Citation:	International Journal of Environmental Research and Public Health, v. 20, n. 4, 3485, Feb. 2023.
Description:	Slash-and-burn of Amazon Forest (AF) for pasture establishment has increased the occurrence of AF wildfires. Recent studies emphasize soil organic matter (SOM) molecular composition as a principal driver of post-fire forest regrowth and restoration of AF anti-wildfire ambience. Nevertheless, SOM chemical shifts caused by AF fires and post-fire vegetation are rarely investigated at a molecular level. We employed pyrolysis-gas chromatography-mass spectrometry to reveal molecular changes in SOM (0?10, 40?50 cm depth) of a slash-burn-and-20-month-regrowth AF (BAF) and a 23-year Brachiaria pasture post-AF fire (BRA) site compared to native AF (NAF). In BAF (0-10 cm), increased abundance of unspecific aromatic compounds (UACs), polycyclic aromatic hydrocarbons (PAHs) and lipids (Lip) coupled with a depletion of polysaccharides (Pol) revealed strong lingering effects of fire on SOM. This occurs despite fresh litter deposition on soil, suggesting SOM minimal recovery and toxicity to microorganisms. Accumulation of recalcitrant compounds and slow decomposition of fresh forest material may explain the higher carbon content in BAF (0?5 cm). In BRA, SOM was dominated by Brachiaria contributions. At 40?50 cm, alkyl and hydroaromatic compounds accumulated in BRA, whereas UACs accumulated in BAF. UACs and PAH compounds were abundant in NAF, possibly air-transported from BAF.
Thesagro:	Sistema de Cultivo Cultivo Migratório Regeneração Natural Pastagem Brachiaria Química do Solo Solo Matéria Orgânica
NAL Thesaurus:	Human settlements Shifting cultivation Acrisols Natural regeneration Soil organic matter Pastures Soil chemistry
Keywords:	Derruba-e-queima Slash-and-burn agriculture Asentamiento humano Acrisoles Regeneración natural Materia orgánica del suelo Pastizales Química del suelo Molecular composition Composição molecular Composición molecular Nitroalkanes Nitroalcanos Van Krevelen 3D diagram Analytical pyrolysis Assentamento Santa Luzia (AC) Cruzeiro do Sul (AC) Acre Amazônia Ocidental Western Amazon Amazonia Occidental
ISSN:	1661-7827 (impresso) / 1660-4601 (online)
DOI:	https://doi.org/10.3390/ijerph20043485
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAF-AC)