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Fungal functional diversity in trace element contaminated soils from the Guadiamar Green Corridor

AuthorsGil Martínez, Marta ; López-García, A. ; Navarro-Fernández, Carmen M. ; Domínguez, María Teresa ; Marañón, Teodoro
Next Generation Sequencing
Fungal community
Fungal guild
Issue Date10-Sep-2019
AbstractFungi play a key role in terrestrial ecosystems as organic matter decomposers and by interacting with plants as symbionts or pathogens. In trace element (e.g. heavy metal) contaminated soils, the effect of restoration measures, such as tree afforestation, in enhancing ecosystem services is of interest. In this study, we hypothesised that vegetation, through soil biotic and abiotic changes, is key in the establishment of soil fungal communities in terms of structure, diversity and function. Twenty years after the accidental spill of the Aznalcóllar mine (April 1998), where acidic waters and pyrite sludge with high concentration of trace elements were released into the Guadiamar River basin, in SW Spain, we have evaluated the recovery of the soil fungal communities. Restoration measures included sludge removal followed by amendments addition and afforestation with native tree species. We selected restored soils within a plant cover gradient consisting of bare soil, grassland to tree (the latter with a comparison between three native species: white poplar, stone pine and wild olive). We also selected two sites, North and South, located at 15 and 30 km from the mine tailing, respectively. A total of 50 soil samples were analysed. We massive sequenced the fungal community in the above-mentioned soils (ITS1F-ITS2 region using the Illumina MiSeq platform). The fungal taxonomy was inferred and the taxa classified by their ecological guild. Interaction of site and plant cover fixed factors were found significant for soil abiotic C:N and P, but not to biotic variables (Table 1). Fungal diversity indices were lower in bare and stone pine soils. Species richness was significantly lower in bare soils. The composition and structure of fungal communities were significantly explained by the interaction of site and plant cover factors (R2 = 0.405). Fungal functionality was assessed by ecological guild ordination (Figure 1). Bare soils were dominated by plant pathogen fungi, while grassland and wild olive soils presented a diversity of fungi dominated by saprotrophs. White poplar and stone pine in the South soils were dominated by ectomycorrhizal fungi, while the North presented diverse guilds such as epiphytes, ericoid mycorrhizal and ectomycorrhizal.
DescriptionAsistencia y participación en la XXXII Reunión Nacional de Suelos en Sevilla (España)
Appears in Collections:(IRNAS) Comunicaciones congresos
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