Produção Nacional
Frações da matéria orgânica em áreas de Latossolo sob diferentes sistemas de manejo no Cerrado do estado de Goiás
2013; UNIVERSIDADE ESTADUAL DE LONDRINA; Volume: 34; Issue: 6 Linguagem: Inglês
10.5433/1679-0359.2013v34n6p2615
ISSN1679-0359
AutoresRoni Fernandes Guareschi, Marcos Gervásio Pereira, Adriano Perín,
Tópico(s)Environmental and biological studies
ResumoThe objective of this study was to evaluate the physical and chemical fractions of soil organic matter (SOM), as well as perform the spectroscopic analysis in ultraviolet-visible humic acid in a Oxisol under no-tillage system (NTS) with different years of implementation, and compare them to areas of native cerrado and pasture. Was evaluated five areas namely: native cerrado (CE), planted pasture (PA) with Brachiaria decumbens; NTS with 3 (NTS 3) years of implementation; NTS with 15 years (NTS 15) of implementation and NTS with more than 20 (NTS 20) years of implementation. The levels and total carbon stocks and humic fractions of SOM, increased with deployment time the NTS at all depths analyzed, with the humic fractions presented the following order: fraction fulvic acid > fraction humic acid > humin fraction. The results showed that depending on the time of implementation of the NTS was observed an increase of more stable fractions of humic substances and physical fractions of SOM, providing greater stability of this system. There is increasing the E4/E6 ratio of humic acids according on the time of implementation of the NTS, demonstrating an increase of aliphatic structures. The area evaluated PA had the lowest concentrations and inventories of humic fractions, carbon associated with minerals (CAM) and E4/E6 ratio, demonstrating to be in an advanced stage of degradation relative to the other areas assessed.
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