Data/hora: 24/06/2024 05:32:05

Biblioteca(s): | Embrapa Acre.
Data corrente: | 07/11/2016
Data da última atualização: | 16/11/2023
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.
Título: | Burning of tropical brazilian rainforest of sandy soil: does it affect soil organic matter?
Ano de publicação: | 2016
Fonte/Imprenta: | 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.
Idioma: | Inglês
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.
Palavras-Chave: | Acre; Amazônia Ocidental; Queimada controlada; Rio Branco (AC).
Thesagro: | Composição Química; Floresta Tropical; Matéria Orgânica; Solo Arenoso.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/149628/1/26192.pdf
Registro original: | Embrapa Acre (CPAF-AC)
Exemplares: | CPAF-AC - (26192-1) - UPC - RA - DD -  -  -  - DIS