Climatic variability and episodic Pinus ponderosa establishment along the forest-grassland ecotones of Colorado

League, Kevin; Veblen, Thomas T.

doi:10.1016/j.foreco.2006.02.030

Cited by 113 publications

(95 citation statements)

References 18 publications

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“…While the conditions created by high-severity fire can lead to dispersal and recruitment limitations [23,25,29], the residual forest structure following mixed-severity fire contained fire-resistant, seed-bearing conifer trees [68], whose location within the landscape, thick bark, and high crown base heights facilitated their survival and post-fire forest recovery. The residual forest following mixed-severity fire was sufficient to support natural regeneration within 12 years following the fire, in a region where seed masting events are episodic [26,69,70] and occur on average every 3-12 years for dominant conifers (ponderosa pine and Douglas-fir), with limited seed availability in intervening years [71].…”

Section: Post-fire Regenerationmentioning

confidence: 99%

Mixed-Severity Fire Fosters Heterogeneous Spatial Patterns of Conifer Regeneration in a Dry Conifer Forest

Malone

Fornwalt

Battaglia

et al. 2018

Forests

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Abstract:We examined spatial patterns of post-fire regenerating conifers in a Colorado, USA, dry conifer forest 11-12 years following the reintroduction of mixed-severity fire. We mapped and measured all post-fire regenerating conifers, as well as all other post-fire regenerating trees and all residual (i.e., surviving) trees, in three 4-ha plots following the 2002 Hayman Fire. Residual tree density ranged from 167 to 197 trees ha −1 (TPH), and these trees were clustered at distances up to 30 m. Post-fire regenerating conifers, which ranged in density from 241 to 1036 TPH, were also clustered at distances up to at least 30 m. Moreover, residual tree locations drove post-fire regenerating conifer locations, with the two showing a pattern of repulsion. Topography and post-fire sprouting tree species locations further drove post-fire conifer regeneration locations. These results provide a foundation for anticipating how the reintroduction of mixed-severity fire may affect long-term forest structure, and also yield insights into how historical mixed-severity fire may have regulated the spatially heterogeneous conditions commonly described for pre-settlement dry conifer forests of Colorado and elsewhere.

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Section: Post-fire Regenerationmentioning

confidence: 99%

Mixed-Severity Fire Fosters Heterogeneous Spatial Patterns of Conifer Regeneration in a Dry Conifer Forest

Malone

Fornwalt

Battaglia

et al. 2018

Forests

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“…Species respond to post-treatment conditions independently [54,55], and regeneration has been linked to stand density, light levels, soil moisture and disturbance, variation in seed production (masting), and site productivity [6,17,54,56]. Interannual climate variation has also been shown to significantly influence recruitment [57,58].…”

Section: Tree Regenerationmentioning

confidence: 99%

Development of Vegetation and Surface Fuels Following Fire Hazard Reduction Treatment

Chiono

O’Hara

Lasaux³

et al. 2012

Forests

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Abstract:In dry western Unites States forests where past resource management has altered the ecological role of fire and stand characteristics alike, mechanical thinning and prescribed burning are commonly applied in wildfire hazard abatement. The reduced surface fuel loads and stand structures resulting from fuels modifications are temporary, yet few studies have assessed the lifespan of treatment effects. We sampled forest fuels and vegetation following fuels reduction in a chronosequence of time since treatment in the northern Sierra Nevada and southern Cascade regions of California. Treatments altered overstory characteristics including stand density, basal area, and species composition. These effects were still present on the oldest treatment sites (8-15 years post-treatment). Other stand characteristics, particularly timelag fuel loads, seedling density, and shrub cover, exhibited substantial variability, and differences between treatment age classes and between treatment and control groups were not statistically significant. OPEN ACCESSForests 2012, 3 701

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“…Episodic recruitment occurs when abundant seed release coincides with favourable habitat and climatic conditions (League & Veblen 2006). Based on the even-aged stands regenerating on benches, concluded that establishment of Casuarina cunninghamiana within the channel of Widden Brook is episodic.…”

Section: Discussionmentioning

confidence: 99%

Survival of Casuarina cunninghamiana on a recovering sand-bed stream in the Wollombi Valley of coastal New South Wales.

Erskine¹,

Chalmers²,

Erskine³

2013

Cunninghamia

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Abstract:The successful management and restoration of riparian corridors in Australia is currently hindered by our poor understanding of the links between hydrology, fluvial geomorphology and plant population dynamics. The aim of the current study was to determine the survival rates of Casuarina cunninghamiana subsp. cunninghamiana Miq. (family Casuarinaceae) on a sand-bed stream in the Wollombi Valley, a tributary of the Hunter River system, in coastal New South Wales (lat 33°02'S; long 151°10'E). A population planted on the banks of Dairy Arm in 1987, as part of river training works, was used to determine the long-term (24-year) survival rate. A bankfull flood in June 2011 provided an opportunity to examine the survival response of seedlings regenerating naturally within the channel. We found that 24% of the seedlings planted on the banks in 1987 had survived to adulthood. The bankfull flood significantly decreased (d.f. = 14; W= -30; p = 0.0024) median seedling density within the channel from 12 to 2 individuals per 100 m 2 . Seedling survival varied with height, with seedlings > 15 cm more likely to survive the bankfull flood. The percentage of seedlings partially buried by sediment was significantly higher (d.f. = 14; W = 13; p = 0.016) after flood compared to before flood. Seedling density was positively correlated with the amount of bare ground prior to the flood (r = 0.61; p = 0.02), but this relationship was no longer significant after flood (r = 0.18; p = 0.53). 37% of the seedlings surveyed showed evidence of grazing. Our results confirm that hydrogeomorphic processes associated with a bankfull flood affect the survival of Casuarina cunninghamiana seedlings. The management implications of our findings are discussed in terms of riparian revegetation techniques and the geomorphic recovery of over-widened sand-bed streams.

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Climatic variability and episodic Pinus ponderosa establishment along the forest-grassland ecotones of Colorado

Cited by 113 publications

References 18 publications

Mixed-Severity Fire Fosters Heterogeneous Spatial Patterns of Conifer Regeneration in a Dry Conifer Forest

Mixed-Severity Fire Fosters Heterogeneous Spatial Patterns of Conifer Regeneration in a Dry Conifer Forest

Development of Vegetation and Surface Fuels Following Fire Hazard Reduction Treatment

Survival of Casuarina cunninghamiana on a recovering sand-bed stream in the Wollombi Valley of coastal New South Wales.

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