Data/hora: 12/06/2024 16:57:58

Provedor de dados: | 64
País: | Brazil
Título: | CHARACTERIZATION AND CLASSIFICATION OF FLOODPLAIN SOILS IN THE PORTO ALEGRE METROPOLITAN REGION, RS, BRAZIL
Autores: | Silva Neto,Luís de França da; Inda,Alberto Vasconcellos; Nascimento,Paulo César Do; Giasson,Elvio; Schmitt,Catiline; Curi,Nilton.
Data: | 2015-10-01
Ano: | 2015
Palavras-chave: | Hydromorphic soils; Quaternary sediments; Specific surface area.
Resumo: | ABSTRACTIn the Porto Alegre metropolitan region (PAMR) there are a significant proportion of floodplain soils, mainly Planosols and Gleysols, in relation to upland soils. This study aimed to evaluate the morphological, chemical and physical characteristics, and to classify floodplain soils in the PAMR. Six soil profiles were evaluated under different sedimentary lithologies and drainage classes, and samples were collected for chemical and physical analyzes. Two orders of mineral soils (Planosols and Gleysols) and one order of organic soil (Organosols) were identified. The soils were moderately deep to deep and stratified. In mineral soils hue ranged between 7.5YR and 2.5Y, with the occurrence of Bg, Btg or Cg gley horizons, while in organic soil the colors were neutral. Sand and silt were the predominant particle sizes according to the origin sedimentary deposits. The organic carbon content was negatively related to soil density and positively related to soil specific surface area and with soil cation exchange capacity. Soil chemical characterization showed expressive variation in bases, aluminum and sodium saturation. Ki index and Fe(CBD)/Fe(H2SO4) ratio indicated a low soil weathering degree. The different sedimentary lithologies and the soil hydromorphism degree were the main factors related to differences in morphological, physical and chemical characteristics of soils in the PAMR.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000500423
Editor: | Editora da Universidade Federal de Lavras
Relação: | 10.1590/S1413-70542015000500001
Formato: | text/html
Fonte: | Ciência e Agrotecnologia  v.39 n.5 2015
Fonte: | info:eu-repo/semantics/openAccess