Título:	Burning of tropical brazilian rainforest of sandy soil: does it affect soil organic matter?
Autoria:	LIMA, M. O. DICK, D. P. COSTA, F. de S. COSTA, J. B. da LARA, L. Z. PERALBA, M. do C.
Afiliação:	Maurifran Oliveira Lima, Universidade Federal do Rio Grande do Sul; Deborah P. Dick, Universidade Federal do Rio Grande do Sul; FALBERNI DE SOUZA COSTA, CPAF-Acre; Janaína B. da Costa, Universidade Federal do Rio Grande do Sul; Larissa Zacher Lara, Universidade Federal do Rio Grande do Sul; Maria do Carmo Peralba, Universidade Federal do Rio Grande do Sul.
Ano de publicação:	2016
Referência:	In: INTERNATIONAL CONFERENCE OF INTERNATIONAL HUMIC SUBSTANCES SOCIETY, 18., 2016, Kanazawa. Keystone for future Earth: Natural Organic Matter (NOM) in diverse environments: proceedings... Kanazawa: IHSS, 2016.
Páginas:	2 p.
Conteúdo:	This study aimed to investigate the impact of vegetation burning on the content and chemical composition of soil organic matter (SOM) along a profile of a sandy Acrisol in Southwestern Amazon, Brazil, within 3 years after experiment beginning(YAB).The study was performed in Rio Branco, Acre State, and the forest burning was performed under controlled conditions. Samples from 6 depth(0-100cm depth)were collected under burned forest (BF) and primary forest (PF) at 1 YAB and 3 YAB. Besides Cand N contents, humic substances and biomarkers were determined. Under PF, the C content decreased with depth from 12 to 2 g kg-1.C/N ratio ranged from 7.6 at the surface to values around 3 at 1 m depth, indicating a predominance of microbial products. Humin fraction was not detected in the whole profile. Burning of vegetation promoted an increase of C and of humic acids only at 0-5 cm. The n-alkane distribution showed a shift towards smaller chains in the 0-5 cm of BF, indicating main contribution of microbial products. Also PAH?s of high molecular weight were detected in this site. Vegetation burning imparts alterations on the SOM composition, but these tend to disappear within 3 years.
Thesagro:	Composição Química Floresta Tropical Matéria Orgânica Solo Arenoso
Palavras-chave:	Queimada controlada Rio Branco (AC) Acre Amazônia Ocidental
Tipo do material:	Resumo em anais e proceedings
Acesso:	openAccess
Aparece nas coleções:	Resumo em anais de congresso (CPAF-AC)