 |
| Titel |
Timing of fire relative to seed development may enable non-serotinous species to recolonize from the aerial seed banks of fire-killed trees |
| VerfasserIn |
S. T. Michaletz, E. A. Johnson, W. E. Mell, D. F. Greene |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 7 ; Nr. 10, no. 7 (2013-07-26), S.5061-5078 |
| Datensatznummer |
250018362
|
| Publikation (Nr.) |
 copernicus.org/bg-10-5061-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The existence of non-serotinous, non-sprouting species in fire regimes where
serotiny confers an adaptive advantage is puzzling, particularly when these
species recruit poorly from soil seed banks or from burn edges. In this
paper, white spruce (Picea glauca (Moench) Voss) was used to show
how the timing of fire relative to seed development may permit non-serotinous
species to recolonize burned areas from the aerial seed banks of fire-killed
trees. To estimate survival of seeds within closed cones during crown fires,
cone heating was simulated using a one-dimensional conduction model
implemented in a three-dimensional computational fluid dynamics fire behavior
model. To quantify the area burned when germinable seed would be contained
within closed cones during a mast year, empirical fire occurrence and seed
development (germinability and cone opening) data were compared for multiple
locations across the white spruce range. Approximately 12% of cones
contained viable seed following crown fire simulations (0.072 m s−1
mean spread rate; 9147 kW m−1 mean intensity), and roughly half of the
historical area burned resulted from fires that occurred when closed cones
would contain germinable seed. Together, these results suggest that
non-serotinous species may recolonize burned areas from in situ aerial seed
banks, and that this may be an important cause of their existence in fire
regimes to which they otherwise seem poorly suited. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|