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Folia Geobotanica

, Volume 50, Issue 3, pp 185–205 | Cite as

Effects of the hydroedaphic gradient on tree species composition and aboveground wood biomass of oligotrophic forest ecosystems in the central Amazon basin

  • Natália Targhetta
  • Jürgen Kesselmeier
  • Florian Wittmann
Article

Abstract

Amazonian forests in black-water floodplains (igapó) and upon hydromorphic white-sand soils (campinarana) cover at least 500,000 km2 of the area of the Amazon basin, but are poorly investigated ecosystems. We compared variation in tree species richness and composition (≥ 10 cm diameter at breast height), as well as forest structure and aboveground wood biomass (AGB) along hydroedaphic gradients in an igapó and a campinarana in the central Brazilian Amazon, in an area totalling 6 ha. Inundation height (igapó) and groundwater level oscillations (campinarana) were monitored during a one year period. Soil grain sizes and chemical variables were analysed. Variation in tree species composition was assessed using non-metric multidimensional scaling, and soil parameters using principal component analysis. The influence of hydroedaphic gradients on tree species richness, composition and AGB was investigated using partial and multiple regression analyses. Significant differences in soil texture, soil chemical variables, and tree species richness and composition were detected between both forest types, while AGB amounted to similar values, ranging from 141 ± 62 Mg·ha−1 in the igapó to 164 ± 121 Mg·ha−1 in the campinarana. Although both forest types were floristically distinct, inundations in the igapó and groundwater table oscillations in the campinarana influenced patterns of species richness and forest structure in similar ways, indicating decreasing species richness, forest stature and AGB in plots subjected to higher inundations and/or groundwater levels. Given the comparatively low AGB in the ecosystems studied, we call attention to the need for more studies in oligotrophic ecosystems of the Amazon basin with emphasis on their contribution to global carbon cycles.

Keywords

Amazon flood-pulse groundwater level soil texture white sand forest 

Notes

Acknowledgements

This work was performed within the frame of the German-Brazilian ATTO project and supported by the federal governments (grant No. MCTI-FINEP 1759/10; grant No. BMBF 01LB1001A). We acknowledge the fundamental support by the Max Planck Society, INPA and UEA. We thank the Amazonas State SDS/CEUC-RDS Uatumã, MAUA Group (Monitoring of Amazonian Wetlands, INPA/Max Planck, Manaus, Brazil) and CAPES.

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Copyright information

© Institute of Botany, Academy of Sciences of the Czech Republic 2015

Authors and Affiliations

  • Natália Targhetta
    • 1
  • Jürgen Kesselmeier
    • 2
  • Florian Wittmann
    • 2
  1. 1.Instituto Nacional de Pesquisas da Amazônia, Programa de Pós-Graduação em EcologiaManausBrazil
  2. 2.Biogeochemistry DepartmentMax Planck Institute for ChemistryMainzGermany

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