Data/hora: 01/06/2024 02:47:25

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 10/05/2023
Data da última atualização: | 14/08/2023
Autoria: | DALMOLIN, R. S. D.; PEDRON, F. de A.; CURCIO, G. R.
Afiliação: | RICARDO S. D. DALMOLIN, UNIVERSIDADE FEDERAL DE SANTA MARIA; FABRÍCIO DE ARAÚJO PEDRON, UNIVERSIDADE FEDERAL DE SANTA MARIA; GUSTAVO RIBAS CURCIO, CNPF.
Título: | Soils of the Southern Araucaria Highlands.
Ano de publicação: | 2023
Fonte/Imprenta: | In: SCHAEFER, C. E. G. R. (ed.). The soils of Brazil. Cham: Springer, 2023. cap. 10.
Páginas: | p. 269-297.
Descrição Física: | Ebook
Série: | (World soils book series).
ISBN: | 978-3-031-19949-3
DOI: | https://doi.org/10.1007/978-3-031-19949-3_10
Idioma: | Inglês
Conteúdo: | The Araucaria Highland Plateaux is known as Mixed Subtropical Rainforest dominated by Araucaria trees, in the highlands plateaus of the southern states of Brazil, such as Paraná, Santa Catarina, and Rio Grande do Sul, with minor areas in isolated highlands in southern São Paulo, Minas Gerais, and Rio de Janeiro States. The climate of Araucaria Plateau is humid temperate mesothermal (subtropical to temperate). The vast majority of soils developed from weathered volcanic rocks of the Serra Geral Formation have a clayey or very clayey texture, resulting from long-term weathering and the intense alteration of riodacites, basalts, and andesitic-basalts. Under subtropical conditions, plagioclases, pyroxenes, amphiboles, biotites, and olivines undergo an almost complete dissolution, leaving little mineral reserves in the coarse fractions of soils, where resistant quartz, magnetite, and ilmenite dominate. The main soil classes are: Latossolos Vermelhos, Latossolos Brunos, Nitossolos Vermelhos or Brunos, Argissolos Bruno-acinzentados, Cambissolos Húmicos or Hísticos, on volcanic rocks, mainly. Argissolos Vermelhos or Vermelho Amarelos also occur on sedimentary or granitic/metamorphic rocks. The chemical weathering of Araucaria Plateau is moderately intense, leading to the formation of kaolinite mixed with hydroxy-Al vermiculite or smectite with little or no illite, due to the absence of muscovite in the parent material. The presence of gibbsite is occasional in some soils, but in low proportions. The predominance of Kaolinite in Araucaria soils is attributed to past colder and wetter climates, favoring organic matter accumulation and aluminum complexation, preventing the formation of gibbsite. Soils from the Araucaria Plateau have unusually high proportions of hydroxy-interlayered Al in 2:1 minerals, representing a marked difference with other deep-weathered tropical soils from elsewhere is Brazil. Most Latossolos (Ferralsols) of southern Brazil show an atypical development of blocky structures and less friable consistency (when wet) compared with Latosolos from elsewhere in the Brazilian tropical regions. This also applies to Nitossolo, with slightly higher clay activity values, as well as higher nutrient reserves. In the Araucaria Plateau, soils below 600 m and well-drained have more hematite than goethite, forming Latossolos Vermelhos or Nitossolos Vermelhos. In the highlands, cool and wetter climates result in greater organic matter contents, high goethite formation and brownification and xanthization process, by the selective dissolution of hematite and precipitation of goethite due to the current humid climate. The Araucaria Plateau possesses large areas with deep, well-developed soils, with high agricultural potential, leading to agribusiness development. This fact, associated with the economic importance of Araucaria as a raw material for the wood and cellulose industry, has contributed to the widespread degradation of the forest and the conversion of areas into annual crops and pastures. It is estimated that only approximately 15% of primitive Araucaria vegetation remains, with an urgent need for conservation measures.
Palavras-Chave: | Acid soil; Highland soil; Humic Latossolo; Neotropical soil; Subtropical landscape; Subtropical soil; Tropical pedology.
Thesagro: | Araucária.
Thesaurus Nal: | Climate change.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (58578-1) - UPC - PL - DD -  -  -  - DIS