Abstract
Background and aims
Seasonally flooded South American savannas harbor different kinds of mound-field landscapes of largely unknown origin. A recent study used soil carbon-isotope depth profiles and other proxies to infer vegetation history in murundu landscapes in Brazil. Results suggested that differential erosion, not building-up processes (e.g., termite mounds), produced mounds. We tested this approach to inferring mound origin in a mound-field landscape in French Guiana.
Methods
We examined carbon-isotope depth profiles of soil organic matter, phytolith profiles and contemporary vegetation composition in mounds and inter-mounds.
Results
Relative abundance of C3 and C4 plants across habitats was very different from that in murundu landscapes; C3 plants were better represented in inter-mounds than on mounds. Habitat differences in C3/C4 distribution were subtler than in murundu landscapes, limiting inference of vegetation history based on carbon isotopes. Still, carbon-isotope and phytolith depth profiles gave similar pictures of vegetation history, both favoring a building-up hypothesis, corroborating other evidence that these mounds are vestiges of ancient agricultural raised fields.
Conclusions
Carbon-isotope depth profiles are unlikely to be adequate for deciphering origin of mound-field landscapes from vegetation history in seasonally flooded savannas. Including data on current vegetation and phytoliths makes inferences more robust.
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Abbreviations
- NMDS:
-
Non-metric multidimensional distance scaling analysis
- MANOVA:
-
Non-parametric multivariate analysis of variance
- SD:
-
Standard deviation
- SOM:
-
Soil organic matter
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Acknowledgements
This study was funded by two interdisciplinary programs of the CNRS (INEE, Institut National Ecologie et Environnement) “Amazonie” and “Ingénièrie Ecologique”. Personnel of the laboratory EcoFog (UMR L3MA, CNRS) in Kourou provided logistical assistance. Marie-Françoise Prévost is thanked for her help with plant determinations at CAY. Bruno Roux (L’AvionJaune, Montpellier) taught DR how to use Pixy™. We thank Dr. J. Römbke (ECT Oekotoxikologie, Flörsheim, Germany) for permission to use the photo of earthworm towers (sartenejales) reproduced in Fig. 1e. Stable isotopes were measured at Bayreuth Center of Ecology and Environmental Research (BayCEER) in the Laboratory of Isotope Biogeochemistry. We thank Finn Kjellberg (CNRS, Montpellier), Marc-André Selosse (University of Montpellier), Leonel Sternberg (University of Miami) and two anonymous reviewers for their critical comments on drafts of the manuscript.
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Renard, D., Birk, J.J., Glaser, B. et al. Origin of mound-field landscapes: a multi-proxy approach combining contemporary vegetation, carbon stable isotopes and phytoliths. Plant Soil 351, 337–353 (2012). https://doi.org/10.1007/s11104-011-0967-8
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DOI: https://doi.org/10.1007/s11104-011-0967-8