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Plant and Soil

, Volume 403, Issue 1–2, pp 7–20 | Cite as

Diversity and plant trait-soil relationships among rock outcrops in the Brazilian Atlantic rainforest

  • Flávio Fonseca do Carmo
  • Claudia Maria Jacobi
Regular Article

Abstract

Aims

We investigated how outcrops of different geological origins enhance the plant megadiversity of the Atlantic rainforest hotspot.

Methods

We collected vegetation, topographic, and soil fertility data from 50 2 m2 plots in each of nine rock outcrops (three ironstones -or cangas, three quartzites and three granitoids) in the Iron Quadrangle, SE Brazil. We examined the response of community diversity and structure patterns to edaphic and topographic gradients by means of diversity profiles, clustering and ordination analyses. Species were organized into nine functional groups.

Results

We inventoried 17,690 individuals belonging to 352 species. Functional groups with largest cover were sclerophytic shrubs (in cangas), graminoid and poikilohydric herbs (in both granitoids and quartzites). Granitoid plant communities were the least diverse, on account of fewer substrate types leading to more xeric conditions. The multivariate analyses sorted the outcrops by geological origin, although within-lithotype similarity was low. There was stronger similarity between cangas and quartzites, separated from granitoids. Soil was nutrient-poor, and variables most influencing this pattern were number of substrates, topographic heterogeneity, soil depth, and aluminum saturation.

Conclusions

Saxicolous plant communities responded more strongly to microtopographic than soil fertility parameters. Each lithotype contributes differently to the high alpha- and especially beta-diversity within the Atlantic Rainforest matrix.

Keywords

Plant trait–environment relationship Rare plants Nutrient-impoverished soils Nurse objects Saxicolous communities Parent rock Microtopography 

Notes

Acknowledgments

This study is part of the first author’s dissertation. We thank the Brazilian National Council for Scientific and Technological Development (CNPq) for fellowships to both authors, the Minas Gerais State Research Council (FAPEMIG), CNPq and the US Fish and Wildlife Service for financial support; Minas Gerais Power Company (CEMIG S.A.) for allowing research within the Estação Ambiental PETI; and the Minas Gerais Forest Institute (IEF-MG) for the research licenses. We are grateful to all colleagues who helped during field work: Felipe do Carmo, Ericson Silva, Leonardo Cotta, Lucas Perillo, Gustavo Heringer, Iara Campos, Matheus Toshiba, and Bruno Falcão. The constructive comments of two anonymous reviewers greatly improved the final version of the manuscript.

Supplementary material

11104_2015_2735_MOESM1_ESM.pdf (504 kb)
ESM 1 (PDF 504 kb)

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Flávio Fonseca do Carmo
    • 1
    • 2
  • Claudia Maria Jacobi
    • 2
  1. 1.Instituto PrístinoBelo HorizonteBrazil
  2. 2.Instituto de Ciências BiológicasUniversidade Federal de Minas GeraisBelo HorizonteBrazil

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