@Article{LealJGKCJCSD:2023:SoOrMa,
               author = "Leal, Ot{\'a}vio dos Anjos and Jim{\'e}nez-Morillo, Nicasio T. 
                         and Gonz{\'a}lez-P{\'e}rez, Jos{\'e} A. and Knicker, Heike and 
                         Costa, Falberni de Souza and Jim{\'e}nez-Morillo, Pedro N. and 
                         Carvalho J{\'u}nior, Jo{\~a}o Andrade de and Santos, Jos{\'e} 
                         Carlos dos and Dick, Deborah Pinheiro",
          affiliation = "{Institute of Bio- and Geosciences—Agrosphere (IBG-3)} and 
                         {Universidade de {\'E}vora} and {Instituto de Recursos Naturales 
                         y Agrobiolog{\'{\i}}a de Sevilla (IRNAS-CSIC)} and {Instituto de 
                         Recursos Naturales y Agrobiolog{\'{\i}}a de Sevilla 
                         (IRNAS-CSIC)} and {Embrapa Acre} and {Universidad Pablo de 
                         Olavide} and {Universidade Estadual Paulista (UNESP)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal do Rio Grande do Sul (UFRGS)}",
                title = "Soil organic matter molecular composition shifts driven by forest 
                         regrowth or pasture after slash-and-burn of Amazon forest",
              journal = "International Journal of Environmental Research and Public 
                         Health",
                 year = "2023",
               volume = "20",
               number = "4",
                pages = "e3485",
                month = "Feb.",
             keywords = "Acrisol, analytical pyrolysis, Brachiaria, Brazilian Amazon, 
                         experimental burning, n-alkanes, van Krevelen 3D diagrams.",
             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.",
                  doi = "10.3390/ijerph20043485",
                  url = "http://dx.doi.org/10.3390/ijerph20043485",
                 issn = "1661-7827 and 1660-4601",
             language = "en",
           targetfile = "ijerph-20-03485-v2.pdf",
        urlaccessdate = "04 jun. 2024"
}