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- Title
Identificação de mudanças florestais por <sup>13</sup>C e <sup>15</sup>N dos solos da Chapada do Araripe, Ceará.
- Authors
Mendonça, Luiz A. R.; Frischkorn, Horst; Santiago, Marlúcia F.; de Camargo, Plínio B.; de Lima, José O. G.; Mendes Filho, Josué
- Abstract
The organic matter (OM) of soils can be used as an auxiliary tool for the identification of past vegetation. In the Floresta Nacional do Araripe and its surroundings, on top of the Araripe Plateau, a study was made using measurements of δ13C and δ15N of soil OM in order to (i) assess present day values for these parameters; (ii) to analyse natural variations of δ13C in soils from different formations of forest; (iii) and to indicate forest decline. It was found that soils from (at present) protected areas, the OM of which exhibits C3 type δ13C of the present vegetation in surface samples but of the C3-C4 type in depth, correspond to ecosystems anthropized in the past through agriculture. Soils maintaining δ13C of the C3 type throughout the entire profile refer to ecosystems anthropized through non-agricultural exploitation. "Caatinga" samples exhibit a δ15N profile that indicates a soil more mineralized and with less OM, whereas reforested preserved areas show recovery of OM.
- Subjects
ARARIPE Plateau (Brazil); PHOTOSYNTHESIS; FOREST declines; HUMUS; ECOLOGY; BIOTIC communities; AGRICULTURE; CAATINGA plants; ANALYSIS of variance
- Publication
Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi, 2010, Vol 14, Issue 3, p314
- ISSN
1807-1929
- Publication type
Article
- DOI
10.1590/S1415-43662010000300012