ORGANIC MATTER IN AREAS UNDER SECONDARY FORESTS AND PASTURE

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Carlos Eduardo Gabriel Menezes Roni Fernandes Guareschi Marcos Gervasio Pereira http://orcid.org/0000-0002-1402-3612 Lúcia Helena Cunha Anjos Maria Elizabeth Fernandes Correia Fabiano Carvalho Balieiro Marisa de Cássia Piccolo

Abstract

The objective of this work was to evaluate the soil carbon density and stock (EstC), the chemical and granulometric fractions of the organic matter and the isotopic signal of the soil δ13C in forest fragments and a mixed pasture area (MMP). The study was carried out in the municipality of Pinheiral, State of Rio de Janeiro. The evaluated areas were: fragment of secondary forest in initial stage (SFIS) with 20 years of regeneration; Fragment of secondary forest in intermediate stage (SFINS), with 25 years of regeneration; Advanced secondary forest fragment (SFAS) with 60 years of regeneration and mixed pasture (MMP). The attributes related to soil carbon showed significant responses to the effects of land degradation / recovery processes, especially for the following indicators: total organic carbon, organic matter stock and particulate organic matter. No significant alterations for humic substances, and prevalence of the humin fraction was found. The most significant changes in d13C values occurred up to the depth of 60 cm. In the grassland area, at 0-10 cm, 67% of the carbon stock comes from C4 plants, reducing in the subsequent layers. In SFINS and SFAS areas, at 0-10 cm, the contribution of C3 plants was significant, with minor changes in depth.

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How to Cite
MENEZES, Carlos Eduardo Gabriel et al. ORGANIC MATTER IN AREAS UNDER SECONDARY FORESTS AND PASTURE. CERNE, [S.l.], v. 23, n. 3, p. 283-290, sep. 2017. ISSN 2317-6342. Available at: <http://cerne.ufla.br/site/index.php/CERNE/article/view/1503>. Date accessed: 16 oct. 2018.
Keywords
Organic carbon; Soil carbon fractions; Isotopic composition; Atlantic forest
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