Mineral nutrition of campos rupestres plant species on contrasting nutrient‐impoverished soil types

2014/11/26 by Rafael S. Oliveira, Hugo C. Galvão, Mariana Campos +3 · 1 citation
Agricultural and Biological Sciences · Chemistry · #Plant nutrient uptake and metabolism #Mycorrhizal Fungi and Plant Interactions #Soil Carbon and Nitrogen Dynamics #Nutrient #Soil water #Biology #Biodiversity #Ecosystem #Colonization #Phosphorus #Agronomy #Botany #Ecology #Chemistry

paper · doi:10.1111/nph.13175

openalex publication_date 2014/11/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/02

Abstract

In Brazil, the campos rupestres occur over the Brazilian shield, and are characterized by acidic nutrient-impoverished soils, which are particularly low in phosphorus (P). Despite recognition of the campos rupestres as a global biodiversity hotspot, little is known about the diversity of P-acquisition strategies and other aspects of plant mineral nutrition in this region. To explore nutrient-acquisition strategies and assess aspects of plant P nutrition, we measured leaf P and nitrogen (N) concentrations, characterized root morphology and determined the percentage arbuscular mycorrhizal (AM) colonization of 50 dominant species in six communities, representing a gradient of soil P availability. Leaf manganese (Mn) concentration was measured as a proxy for carboxylate-releasing strategies. Communities on the most P-impoverished soils had the highest proportion of nonmycorrhizal (NM) species, the lowest percentage of mycorrhizal colonization, and the greatest diversity of root specializations. The large spectrum of leaf P concentration and variation in root morphologies show high functional diversity for nutritional strategies. Higher leaf Mn concentrations were observed in NM compared with AM species, indicating that carboxylate-releasing P-mobilizing strategies are likely to be present in NM species. The soils of the campos rupestres are similar to the most P-impoverished soils in the world. The prevalence of NM strategies indicates a strong global functional convergence in plant mineral nutrition strategies among severely P-impoverished ecosystems.

Citations

• Soil phosphorus: its measurement, and its uptake by plants
• Extraction of phosphorus, potassium, calcium, and magnesium from soils by an ion‐exchange resin procedure
• Underground leaves of Philcoxia trap and digest nematodes
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Cited by

• Campos rupestres [wikipedia]