Consequences of removal of exotic species (eucalyptus) on carbon and nitrogen cycles in the soil-plant system in a secondary tropical Atlantic forest in Brazil with a dual-isotope approach

PeerJ
Milena Carvalho TeixeiraGabriela B Nardoto

Abstract

The impact of exotic species on heterogeneous native tropical forest requires the understanding on which temporal and spatial scales these processes take place. Functional tracers such as carbon (δ13C) and nitrogen (δ15N) isotopic composition in the soil-plant system might help track the alterations induced by the exotic species. Thus, we assess the effects from the removal of the exotic species eucalyptus (Corymbia cytriodora) in an Atlantic forest Reserve, and eucalyptus removal on the alteration of the nutrient dynamics (carbon and nitrogen). The hypotheses were: (1) the eucalyptus permanence time altered δ13C and δ15N in leaves, soils and litter fractions (leaves, wood, flowers + fruits, and rest); and (2) eucalyptus removal furthered decomposition process of the soil organic matter. Hence, we determined the soil granulometry, the δ13C and δ15N in leaves, in the superficial soil layer, and litter in three sites: a secondary forest in the Atlantic forest, and other two sites where eucalyptus had been removed in different times: 12 and 3 months ago (M12 and M3, respectively). Litter samples presented intermediate δ13C and δ15N values in comparison with leaves and soil. In the M3, the greater δ13C values in both litter rest fr...Continue Reading

References

Jan 1, 2003·Journal of Experimental Botany·Matthew J Paul, Till K Pellny
Mar 16, 2005·Annals of Botany·Achim Walter, Ulrich Schurr
May 10, 2005·Rapid Communications in Mass Spectrometry : RCM·Franz-W BadeckJaleh Ghashghaie
May 16, 2007·Proceedings of the National Academy of Sciences of the United States of America·Benjamin Z HoultonLars O Hedin
Feb 1, 1998·Oecologia·Amy T Austin, P M Vitousek

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Statistical Package for the Social Sciences ( SPSS )
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