Amazonian biomass burning‐derived acid and nutrient deposition in the north Andean montane forest of Ecuador

Global Biogeochemical Cycles - Tập 22 Số 4 - 2008
Jens Boy1, Rütger Rollenbeck2, Carlos Valarezo3, Wolfgang Wilcke1
1Geographic Institute, Johannes Gutenberg University, Mainz, Germany
2Geographic Institute, Philipps University, Marburg, Germany
3Dirección General de Investigaciones Universidad Nacional de Loja Loja Ecuador

Tóm tắt

We explored the influence of biomass burning in Amazonia and northeastern Latin America on N, C, P, S, K, Ca, Mg, Al, Mn, and Zn cycles of an Andean montane forest in south Ecuador exposed to the Amazon basin between May 1998 and April 2003. We assessed the response of the element budget of three microcatchments (8–13 ha) to the variations in atmospheric deposition between the intensive burning season and outside the burning season in Amazonia. There were significantly elevated H, N, and Mn depositions during biomass burning. Elevated H deposition during biomass burning caused elevated base metal loss from the canopy and the organic horizon and deteriorated already low base metal supply of the vegetation. N was only retained during biomass burning but not during nonfire conditions when deposition was much smaller. We conclude that biomass burning‐related aerosol emissions in Amazonia are large enough to substantially increase element deposition at the western rim of Amazonia. Particularly the related increase of acid deposition impoverishes already base metal scarce ecosystems. As biomass burning is most intense during El Niño situations, a shortened El Niño–Southern Oscillation cycle because of global warming likely enhances the acid deposition at our study forest.

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Global Biogeochemical Cycles

Tập 22 Số 4

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