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		<doi>10.3390/ijerph20043485</doi>
		<issn>1661-7827</issn>
		<issn>1660-4601</issn>
		<citationkey>LealJGKCJCSD:2023:SoOrMa</citationkey>
		<title>Soil organic matter molecular composition shifts driven by forest regrowth or pasture after slash-and-burn of Amazon forest</title>
		<year>2023</year>
		<month>Feb.</month>
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		<author>Leal, Otávio dos Anjos,</author>
		<author>Jiménez-Morillo, Nicasio T.,</author>
		<author>González-Pérez, José A.,</author>
		<author>Knicker, Heike,</author>
		<author>Costa, Falberni de Souza,</author>
		<author>Jiménez-Morillo, Pedro N.,</author>
		<author>Carvalho Júnior, João Andrade de,</author>
		<author>Santos, José Carlos dos,</author>
		<author>Dick, Deborah Pinheiro,</author>
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		<orcid>0000-0003-2786-4119</orcid>
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		<orcid>0000-0002-0483-2109</orcid>
		<orcid>0000-0002-0896-7967</orcid>
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		<group>COPDT-CGIP-INPE-MCTI-GOV-BR</group>
		<affiliation>Institute of Bio- and Geosciences—Agrosphere (IBG-3)</affiliation>
		<affiliation>Universidade de Évora</affiliation>
		<affiliation>Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC)</affiliation>
		<affiliation>Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC)</affiliation>
		<affiliation>Embrapa Acre</affiliation>
		<affiliation>Universidad Pablo de Olavide</affiliation>
		<affiliation>Universidade Estadual Paulista (UNESP)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Universidade Federal do Rio Grande do Sul (UFRGS)</affiliation>
		<electronicmailaddress>o.dos.anjos.leal@fz-juelich.de</electronicmailaddress>
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		<electronicmailaddress>jose.santos@inpe.br</electronicmailaddress>
		<journal>International Journal of Environmental Research and Public Health</journal>
		<volume>20</volume>
		<number>4</number>
		<pages>e3485</pages>
		<secondarymark>A2_INTERDISCIPLINAR A2_CIÊNCIAS_AGRÁRIAS_I B1_SAÚDE_COLETIVA B1_ODONTOLOGIA B1_NUTRIÇÃO B1_MEDICINA_III B1_MEDICINA_II B1_GEOCIÊNCIAS B1_ENFERMAGEM B1_EDUCAÇÃO_FÍSICA B2_FARMÁCIA B2_CIÊNCIAS_BIOLÓGICAS_II B3_CIÊNCIAS_AMBIENTAIS</secondarymark>
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		<keywords>Acrisol, analytical pyrolysis, Brachiaria, Brazilian Amazon, experimental burning, n-alkanes, van Krevelen 3D diagrams.</keywords>
		<abstract>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 pyrolysisgas chromatographymass spectrometry to reveal molecular changes in SOM (010, 4050 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 (010 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 (05 cm). In BRA, SOM was dominated by Brachiaria contributions. At 4050 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.</abstract>
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		<language>en</language>
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