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Título : Litterfall dynamics in a iron-rich rock outcrop complex in the southeastern portion of the Iron Quadrangle of Brazil.
Autor : Valim, Eduardo André Ribeiro
Nalini Júnior, Hermínio Arias
Kozovits, Alessandra Rodrigues
Palabras clave : Canga
Iron duricrust
Ferruginous fields
Litter production
Ecosystem productivity
Fecha de publicación : 2013
Citación : VALIM, E. A. R.; NALINI JÚNIOR, A. R.; KOZOVITS, A. R. Litterfall dynamics in a iron-rich rock outcrop complex in the southeastern portion of the Iron Quadrangle of Brazil. Acta Botanica Brasílica, v. 27, p. 289-296, 2013. Disponível em: <http://www.scielo.br/scielo.php?pid=S0102-33062013000200005&script=sci_arttext>. Acesso em: 15 out. 2014.
Resumen : Ecosystems on cangas (duricrust) present considerable heterogeneity of habitats due to microtopographic variations, soil accumulation and a variety of plant functional groups. Therefore, spatial and temporal ecosystem processes such as litterfall are to be expected to be large, and the absence of a level of productivity represents all the facets of iron-rich landscapes. We investigated litterfall in a iron-rich rock complex in the Iron Quadrangle of Brazil, with habitats formed on different evolutionary stages of the soil, resulting in a gradient of biomass, canopy cover and community structure. The measurements were made in open field areas, dominated by herb-shrub vegetation and interspersed with islands of dense vegetation in which there were individual trees, as well as in areas of semideciduous forest. The litterfall, especially that of leaf litter, followed the gradient of woody cover and was approximately two times greater in the forest formation. However, the spatial and temporal variations in deposition were greatest in the herb-shrub areas and least in the semideciduous forest area, intermediate values being obtained for the tree island areas. The peaks in litterfall also varied among habitats, occurring in some periods of the rainy season and during the transition from rainy to dry in the herb-shrub and tree island areas, whereas they occurred at the end of the dry season in the semideciduous forest area. The results show significant differences in the patterns of litterfall among different physiognomies within the same iron-rich rock complex, indicating the need for expanded studies, focusing on the flowof matter and energy in such environments.
URI : http://www.repositorio.ufop.br/handle/123456789/4766
metadata.dc.identifier.doi: http://dx.doi.org/10.1590/S0102-33062013000200005
ISSN : 167-7941
metadata.dc.rights.license: Todo o conteúdo do periódico Acta Botanica Brasilica, exceto onde identificado, está sob uma licença Creative Commons 4.0 que permite copiar, distribuir e transmitir o trabalho em qualquer suporte ou formato desde que sejam citados o autor e o licenciante. Fonte: Acta Botanica Brasilica <http://www.scielo.br/scielo.php?script=sci_serial&pid=0102-3306&lng=pt&nrm=iso>. Acesso em: 14 out. 2016.
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