Post‐fire seedling establishment in Florida sand pine scrub

Carrington, Mary E.

doi:10.2307/3237069

Cited by 37 publications

(25 citation statements)

References 22 publications

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“…Probably, advantages of this mechanism on these habitats could be determined by the spreading germination over time. Rupture of dormancy several weeks or months after fire could be an advantage avoiding unsuitable conditions in the immediate postfire period, which could limit the success of seedling establishment or survival (Frazer and Davis 1988;Carrington 1999;De Luis et al 2005). Hodgkinson (1991) found in semiarid woodland with no seasonal rainfall pattern in inner south-eastern Australia higher germination and survival rates for leguminous species regenerated after spring and summer fires than in winter fires.…”

Section: Discussionmentioning

confidence: 99%

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

et al. 2010

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M. (2010). Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species. Australian Journal of Botany, 58 (7), 539-545.Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species AbstractIn addition to direct fire cues such as heat, smoke and charred wood, the passage of fire leads indirectly to changes in environmental conditions which may be able to break physical dormancy in hard-coated seeds. After a fire, the open canopy and the burnt material lying on the surface alter the thermal properties of the soil, resulting in elevated soil temperatures for long periods of time. We simulated daily temperature regimes experienced at different depths of soil profile after a summer fire. Our aim was to determine whether these temperature regimes and the duration of exposure (5, 15 and 30 days) play an important role breaking physical seed dormancy in six legumes from south-eastern Australia. Our results showed that simulated temperature regimes break seed dormancy. This effect is specially pronounced at temperatures that are expected to occur near the soil surface (0-2 cm depth). The duration of exposure interacts with temperature to break dormancy, with the highest germination rates reached after the longest duration and highest temperatures. However, the germination response varied among species. Therefore, this indirect post-fire cue could play a role in the regeneration of plant communities, and could stimulate seedling emergence independent of direct fire cues as well as in interaction with direct cues. © 2010 CSIRO. Abstract. In addition to direct fire cues such as heat, smoke and charred wood, the passage of fire leads indirectly to changes in environmental conditions which may be able to break physical dormancy in hard-coated seeds. After a fire, the open canopy and the burnt material lying on the surface alter the thermal properties of the soil, resulting in elevated soil temperatures for long periods of time. We simulated daily temperature regimes experienced at different depths of soil profile after a summer fire. Our aim was to determine whether these temperature regimes and the duration of exposure (5, 15 and 30 days) play an important role breaking physical seed dormancy in six legumes from south-eastern Australia. Our results showed that simulated temperature regimes break seed dormancy. This effect is specially pronounced at temperatures that are expected to occur near the soil surface (0-2 cm depth). The duration of exposure interacts with temperature to break dormancy, with the highest germination rates reached after the longest duration and highest temperatures. However, the germination response varied among species. Therefore, this indirect post-fire cue could play a role in the regeneration of plant communities, and could stimulate seedling emergence independent of direct fire cues as well as in interaction with direct cues.

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Section: Discussionmentioning

confidence: 99%

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

et al. 2010

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“…These higher resource conditions likely decreased environmental stress experienced by seedlings relative to the prior year. Establishment in post-fire environments can be positively influenced by decreased competition and increased nutrient availability (Carrington 1999;Rau et al 2008), but it can also be negatively affected by increased temperature and exposure (Bullock 2009). Our results indicate that rapid resprouting of L. argenteus post-fire provides important environmental modifications by further increasing soil N and moisture and decreasing light and temperature under its canopy.…”

Section: Discussionmentioning

confidence: 98%

Facilitation and interference of seedling establishment by a native legume before and after wildfire

Goergen

Chambers

2011

Oecologia

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In semi-arid ecosystems, heterogeneous resources can lead to variable seedling recruitment. Existing vegetation can influence seedling establishment by modifying the resource and physical environment. We asked how a native legume, Lupinus argenteus, modifies microenvironments in unburned and burned sagebrush steppe, and if L. argenteus presence facilitates seedling establishment of native species and the non-native annual grass, Bromus tectorum. Field treatments examined mechanisms by which L. argenteus likely influences establishment: (1) live L. argenteus; (2) dead L. argenteus; (3) no L. argenteus; (4) no L. argenteus with L. argenteus litter; (5) no L. argenteus with inert litter; and (6) mock L. argenteus. Response variables included soil nitrogen, moisture, temperature, solar radiation, and seedling establishment of the natives Elymus multisetus and Eriogonum umbellatum, and non-native B. tectorum. In both unburned and burned communities, there was higher spring soil moisture, increased shade and reduced maximum temperatures under L. argenteus canopies. Adult L. argenteus resulted in greater amounts of soil nitrogen (N) only in burned sagebrush steppe, but L. argenteus litter increased soil N under both unburned and burned conditions. Although L. argenteus negatively affected emergence and survival of B. tectorum overall, its presence increased B. tectorum biomass and reproduction in unburned plots. However, L. argenteus had positive facilitative effects on size and survival of E. multisetus in both unburned and burned plots. Our study indicates that L. argenteus can facilitate seedling establishment in semi-arid systems, but net effects depend on the species examined, traits measured, and level of abiotic stress.

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“…Where broad scale disturbances, such as fire, trigger recruitment in most or all species, the potential impacts of delayed recruitment are likely to be exacerbated due to increased occupation of space and consumption of available resources. However, these impacts may be offset if the immediate post-fire habitat is hostile to seeds or seedlings due to more severe environmental stress or increased risk of other extreme events such as severe soil erosion (Carrington 1999;De Luis et al 2008;Pratt et al 2008). In some fire-prone habitats such as longleaf pine savannas, opportunities for recruitment are less frequent than fire events (Brewer and Platt 1994).…”

Section: The Influence Of Litter On Seedling Recruitmentmentioning

confidence: 99%

The coupling of recruitment and disturbance by fire in two resprouting Proteaceae species

Denham

Whelan

Auld³

et al. 2010

Plant Ecol

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Recruitment in plant populations is often tightly coupled to major disturbances such as fires. For species with persistent seed banks, fire-related cues may allow or enhance germination. The litter layer influences germination and may modify the impact of seed predators on seeds and seedlings. The litter layer is obviously affected by fire, providing one mechanism by which disturbance can determine recruitment. We tested the role of litter in the disturbance-recruitment coupling of two species with contrasting seed release timing after fire-Banksia serrata (canopy seed bank) and Telopea speciosissima (transient seed bank) by planting their seeds both early and late in the post-fire recruitment period (PRP) and manipulating litter density in orthogonal treatments. Vertebrate seed predators were excluded. Both species established more seedlings late in the PRP, although results were strongly influenced by very poor establishment at one site. Invertebrate seed predators consumed more T. speciosissima seeds in sites early (69.5%) than late in the PRP (51.2%), while consumption of B. serrata seeds was lower overall and comparable across sites (average 47.3%). Surprisingly, litter had very little effect on establishment and none on invertebrate seed predation, suggesting that other factors are more important. Recruitment was only loosely coupled to disturbance for the canopy seed bank species; for the transient seed bank species, the coupling was tighter but separated in time from the disturbance. Understanding both the strength and temporal aspects of the disturbance-recruitment coupling is necessary for appropriate management of plant functional diversity in fire-prone habitats.

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Post‐fire seedling establishment in Florida sand pine scrub

Cited by 37 publications

References 22 publications

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

Effects of soil temperature regimes after fire on seed dormancy and germination in six Australian Fabaceae species

Facilitation and interference of seedling establishment by a native legume before and after wildfire

The coupling of recruitment and disturbance by fire in two resprouting Proteaceae species

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