Details

Autor(en) / Beteiligte

• Dodonov, Pavel
• Xavier, Rafael de Oliveira
• Tiberio, Fernanda Cristina dos Santos
• Lucena, Isabela Codolo de
• Zanelli, Carolina Brandão
• Silva Matos, Dalva Maria da

Titel

Driving factors of small-scale variability in a savanna plant population after a fire

Ist Teil von

• Acta oecologica (Montrouge), 2014-04, Vol.56 (56), p.47-55

Ort / Verlag

Amsterdam: Elsevier Masson SAS

Erscheinungsjahr

2014

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• The severity of fire impacts on fire-prone vegetation is often spatially heterogeneous, and may lead to small-scale patchiness in the structure of plant populations by affecting mortality, topkill, and reproduction. This patchiness, however, is not usually taken into account in fire ecology studies. We show that a dry-season fire may result in small-scale patchiness in the population structure of the common shrub Miconia albicans, mostly by differential topkill and resprouting. We related fire severity to population structure parameters of the study species and assessed the effects of fire on its soil seed bank. Basal area of non-woody live stems and of dead stems increased with fire severity, whereas that of woody live stems decreased, indicating topkill and resprouting. However, there was no relationship between fire severity and the total number of live or dead plants, showing that mortality in the fire was low. We found very few seedlings, indicating that resprouting, not germination from the soil seed bank, is the main recovery strategy of this species. The fire also affected the soil seed bank, as there were fewer seedlings emerging from soil collected in burned patches. Although this study was performed with a single species, it is likely that other species, especially those with basal resprouting, will show similar patterns of post-fire patchiness in population structure. This patchiness, in turn, may affect the spatial distribution of future fires, and should be taken into account in studies of fire ecology. •Fire severity in a given area is often spatially heterogeneous.•Spatial heterogeneity of fire may result in spatial heterogeneity in the population structure of woody plants.•The main changes in the population structure of a savanna shrub after a fire are due to topkill and resprouting.•Mortality and germination from seed bank play a small role in post-fire population structure in a Savanna shrub.