Journal
REVISTA BRASILEIRA DE CIENCIA DO SOLO
Volume 39, Issue 1, Pages 222-231Publisher
SOC BRASILEIRA DE CIENCIA DO SOLO
DOI: 10.1590/01000683rbcs20150048
Keywords
hydromorphic soils; land use; particulate fraction; humic substances; organic carbon
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Funding
- Foundation for Research Support of the State of Goias (FAPEG)
- Laboratories of Soil Microbiological and Biochemical Analyses
- Laboratories of Soil and Foliar Analyses of Escola de Agronomia da Universidade Federal de Goias (LASF/EA/UFG)
- Laboratory of Studies of Soil Organic Matter of Faculdade de Agronomia e Medicina Veterinaria da Universidade de Brasilia (LAbMOS/FAV/UnB)
- Laboratory of Agri-Environmental Analyzes (LAA) of Embrapa Arroz e Feijao
- Foundation for Research Support (FUNAPE/UFG)
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Veredas are humid tropical ecosystems, generally associated to hydromorphic soils and a shallow water table. The soils of these ecosystems are affected by the use of the areas around these veredas. The objective of this study was to determine soil organic matter (SOM) fractions in veredas adjacent to preserved (native savanna) and disturbed environments (agricultural areas and pastures) in the Cerrado biome. Soil samples were collected from the 0-10 and 10-20 cm layers along reference lines drawn along the relief following the upper, middle and lower positions of one of the slopes, in the direction of the draining line of the vereda. The soil analysis determined: total soil OC, total nitrogen and C:N ratio; C and N contents and C:N ratio in particulate and mineral-associated fractions (of SOM); fulvic acids, humic acids and humin fractions and ratio between humic and fulvic acids. The agricultural use around the veredas induced changes in the SOM fractions, more pronounced in the lower part of the slope. In the soil surface of this part, the OC levels in the humic substances and the particulate fraction of SOM, as well as total soil OC were reduced in the vereda next to crop fields.
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