The dynamics of the soil seed bank after a fire event in a woody savanna in central Brazil

Andrade, Luciana Aparecida Zago de; Miranda, Heloísa S.

doi:10.1007/s11258-014-0378-z

Cited by 60 publications

(45 citation statements)

References 41 publications

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“…The native species that were able to establish were mostly wind‐dispersed herbs and shrubs. Even though we lack conclusive evidence, several studies suggest Cerrado species may not form persistent seed banks in the field (Andrade & Miranda, ; Machado et al, ; Pereira‐Diniz & Ranal, ; Zaidan & Carreira, ).…”

Section: Discussionmentioning

confidence: 61%

Synergistic impacts of co‐occurring invasive grasses cause persistent effects in the soil‐plant system after selective removal

et al. 2020

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1. Human influence on the environment is so extensive that virtually all ecosystems on the planet are now affected by biological invasions. And, often, ecosystems are invaded by multiple co-occurring non-native species. Hence, it is important to understand the impacts these invasions are producing on biodiversity and ecosystem processes.2. Here, we present results of a 2-year long field experiment where we tested the effects of co-occurring invasive C 4 African grasses in a Cerrado area in central Brazil. We compared plant and arthropod communities, plant biomass, and soil nitrogen dynamics and soil chemical characteristics across five experimental treatments: Urochloa decumbens removal; Melinis minutiflora removal; both U. decumbens and M. minutiflora removal; U. decumbens and M. minutiflora invaded plots; and uninvaded Cerrado. We hypothesized that selective removal of invasive grasses would have distinct effects on the native ecosystem structure and functioning. We expected that each invasive grass would produce a different type of impact on the native ecosystem and that their impacts would be synergistic when co-occurring.3. Removal of M. minutiflora doubled native plant diversity and biomass when compared to invaded plots, whereas removal of U. decumbens did not alter these parameters. Cerrado plots had four times more plant species than plots cleared of invasives. Removal of invasive grasses did not affect the species richness or community composition of soil epigeal fauna. Cerrado soils had lower fertility, organic matter content and pH than invaded soils. The effects were generally higher when both invasive grasses were removed, suggesting impacts were synergistic, but M. minutiflora had greater effects on plants and soils than U. decumbens.Both invasive species produced negative impacts, but a single species was the main driver. We also detected persistent effects of the invasive grass species on the ecosystem after 2 years of removal.4. We conclude that invasive species of the same functional group have similar types of effects in native ecosystems, but the magnitude of impact was largely dependent on | 1103Functional Ecology ZENNI Et al.

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Section: Discussionmentioning

confidence: 61%

Synergistic impacts of co‐occurring invasive grasses cause persistent effects in the soil‐plant system after selective removal

et al. 2020

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“…Decreased fire frequency might lead to the decrease of open vegetation, as closed woodland is less flammable than grassland, and grassland seed bank is supported by fire. de Andrade and Miranda () found that in the Brazilian cerrado, 1 year after the fire, the monocot seed density did not reach the prefire value, whereas the density of dicot seeds increased 3‐fold. After the fire, the viable seed density and species richness decreased with the onset of the rainy season coinciding with germination in the field.…”

Section: Resultsmentioning

confidence: 99%

Grassland seed bank and community resilience in a changing climate

Kiss

Deák

Török

et al. 2018

Restoration Ecology

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Plant dispersal and persistence strategies play an increasingly important role in the face of changing climate. Evaluating the restoration potential of soil seed banks as an important component of community resilience is crucial for developing effective grassland conservation and restoration strategies under climate change. Soil seed banks can act as a source for vegetation recovery by preserving species and supporting their establishment by assisting persistence and recolonization. In a systematic review of field and experimental seed bank studies, we evaluated the potential of seed banks in buffering climatic extremities and fluctuations. We found 42 papers testing the first‐order (temperature and precipitation changes) and second‐order effects of climate change (flooding and fire) on the seed bank in grasslands. We showed that persistent seed banks can support passive restoration especially in wetlands and habitats where unpredictable and frequent disturbance was typical in the historical timescale. We found that active restoration by seed addition will be most important in less disturbance‐adapted habitats characterized by species with transient seed banks. In such cases, the introduction of native matrix species that can tolerate the predicted climatic change should be prioritized at degraded sites.

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“…The information presented here can be used in studies on the restoration of invaded Cerrado areas, as the Cerrado soil seed bank is transient, with a maximum seed density of 63–144 seeds/m 2 , mostly from graminoids, subshrubs and shrubs (Andrade & Miranda, ; Salazar et al., ). These plants generally show lower germination rates (Aires, Sato, & Miranda, ; Le Stradic et al., ; Overbeck, Müller, Pillar, & Pfadenhauer, ) than the seedling emergence rate observed here for U. decumbens .…”

Section: Discussionmentioning

confidence: 99%

“…The seed bank can be transient or permanent, and is considered permanent when the seeds remain viable in the soil for more than one year (Simpson, Leck, & Parker, ). Recruitment of new individuals via a persistent seed bank would contribute to increased invasiveness of a species, especially in ecosystems where most species form a transient seed bank, as in the Cerrado (Andrade & Miranda, ; Salazar, Goldstein, Franco, & Miralles‐Wilhelm, ).…”

Section: Introductionmentioning

confidence: 99%

Seed longevity and seedling emergence rate of Urochloa decumbens as influenced by sowing depth in a Cerrado soil

Dantas-Junior

Musso

Miranda

2018

Grass and Forage Science

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Urochloa decumbens (Signal grass) is an African grass species that is widely used in Brazil for pasture formation, and it has a high potential for invading natural areas. This study evaluated the longevity of U. decumbens seeds in the soil seed bank and the emergence rates of seedlings from different depths. In the greenhouse (natural light; ~25°C), seeds were sown at depths of 0, 1, 2 or 3 cm, in trays filled with sterile soil, to assess seedling emergence. Seeds sowed on the soil surface began to germinate 3 days after sowing. Seeds sowed at depths of 2 and 3 cm germinated 5 days after sowing. No seedlings emerged after 15 days. The seedling emergence rate was 74 ± 7% with no significant difference between sowing depths. In the field, seed longevity was evaluated by burying 60 replicates of 100 seeds at a soil depth of 2–3 cm, in a Cerrado area in the IBGE Ecological Reserve, Brasília. From September 2016 to April 2017, five samples were retrieved monthly to assess seed viability. In September, the viability was 68%, declining to 3% in October; by February, viable seeds were no longer recorded. As U. decumbens flowers in several episodes throughout the year, a soil survey may result in a misleading interpretation of the formation of a permanent soil seed bank.

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The dynamics of the soil seed bank after a fire event in a woody savanna in central Brazil

Cited by 60 publications

References 41 publications

Synergistic impacts of co‐occurring invasive grasses cause persistent effects in the soil‐plant system after selective removal

Synergistic impacts of co‐occurring invasive grasses cause persistent effects in the soil‐plant system after selective removal

Grassland seed bank and community resilience in a changing climate

Seed longevity and seedling emergence rate of Urochloa decumbens as influenced by sowing depth in a Cerrado soil

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