The Relative Importance of Biotic and Abiotic Controls on Young Conifer Growth After Fire in the Klamath-Siskiyou Region

Irvine, Daniel R.; Hibbs, David E.; Shatford, Jeffrey P.A.

doi:10.3955/046.083.0405

Cited by 13 publications

(16 citation statements)

References 65 publications

(29 reference statements)

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“…, Irvine et al. ), and rapidly growing shrubs compete with conifer seedlings for these resources in the years following a fire (Gordon and Rice , Knapp et al. ).…”

Section: Discussionmentioning

confidence: 99%

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Predicting conifer establishment post wildfire in mixed conifer forests of the North American Mediterranean‐climate zone

2016

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Abstract. Due to fire suppression policies, timber harvest, and other management practices over the last century, many low-to mid-elevation forests in semiarid parts of the western United States have accumulated high fuel loads and dense, multi-layered canopies that are dominated by shade-tolerant and firesensitive conifers. To a great extent, the future status of western US forests will depend on tree species' responses to patterns and trends in fire activity and fire behavior and postfire management decisions. This is especially the case in the North American Mediterranean-climate zone (NAMCZ), which supports the highest precipitation variability in North America and a 4-to 6-month annual drought, and has seen greater-than-average increases in air temperature and fire activity over the last three decades. We established 1490 survey plots in 14 burned areas on 10 National Forests across a range of elevations, forest types, and fire severities in the central and northern NAMCZ to provide insight into factors that promote natural tree regeneration after wildfires and the differences in postfire responses of the most common conifer species. We measured site characteristics, seedling densities, woody shrub, and tree growth. We specified a zero-inflated negative binomial mixed model with random effects to understand the importance of each measured variable in predicting conifer regeneration. Across all fires, 43% of all plots had no conifer regeneration. Ten of the 14 fires had median conifer seedling densities that did not meet Forest Service stocking density thresholds for mixed conifer forests. When regeneration did occur, it was dominated by shadetolerant but fire-sensitive firs (Abies spp.), Douglas-fir (Pseudotsuga menziesii) and incense cedar (Calocedrus decurrens). Seedling densities of conifer species were lowest in sites that burned at high severity, principally due to the biotic consequences of high severity fire, for example, increased distances to live seed trees and competition with fire-following shrubs. We developed a second model specifically for forest managers and restoration practitioners who work in yellow pine and mixed conifer forests in the central NAMCZ to assess potential natural regeneration in the years immediately following a fire, allowing them to prioritize which areas may need active postfire forest restoration and supplemental planting.

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“…, Irvine et al. ), and rapidly growing shrubs compete with conifer seedlings for these resources in the years following a fire (Gordon and Rice , Knapp et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…, Irvine et al. , Pierce and Taylor ). Although a number of studies have examined the effects of a single fire on specific species (Harvey et al.…”

Section: Introductionmentioning

confidence: 99%

Predicting conifer establishment post wildfire in mixed conifer forests of the North American Mediterranean‐climate zone

2016

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“…replenish soil nitrogen. In the Klamaths, both the density and relative growth rate of conifer regeneration correlate positively with density of broadleaves in recovering burns within the Douglas-fir and Douglas fir/ tanoak vegetation series (Shatford et al, 2007;Irvine et al, 2009). These associations are negative in the white fir series; however, Shatford et al (2007) found abundant conifer regeneration within shrub fields in that zone.…”

Section: Biodiversity Threats Associated With Contemporary Conditionsmentioning

confidence: 90%

The ecology of mixed severity fire regimes in Washington, Oregon, and Northern California

Perry

Hessburg

Skinner

et al. 2011

Forest Ecology and Management

272

276

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“…Using this model selection method, we do not assess the statistical power of single models, but rank their relative importance (Irvine et al 2009). In general, models with a high number of parameters involved are penalized more heavily to avoid overfitting of models (law of simplicity and parsimony) and, therefore, disadvantaged in favour of competing models with less parameters.…”

Section: Discussionmentioning

confidence: 99%

Solar radiation stress in climbing snails: behavioural and intrinsic features define the Hsp70 level in natural populations of Xeropicta derbentina (Pulmonata)

Lellis

Seifan

Troschinski

et al. 2012

Cell Stress and Chaperones

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Ectotherms from sunny and hot environments need to cope with solar radiation. Mediterranean land snails of the superfamily Helicoidea feature a behavioural strategy to escape from solar radiation-induced excessive soil heating by climbing up vertical objects. The height of climbing, and also other parameters like shell colouration pattern, shell orientation, shell size, body mass, actual internal and shell surface temperature, and the interactions between those factors may be expected to modulate proteotoxic effects in snails exposed to solar radiation and, thus, their stress response. Focussing on natural populations of Xeropicta derbentina, we conducted a 'snapshot' field study using the individual Hsp70 level as a proxy for proteotoxic stress. In addition to correlation analyses, an IT-model selection approach based on Akaike's Information Criterion was applied to evaluate a set of models with respect to their explanatory power and to assess the relevance of each of the abovementioned parameters for individual stress, by model averaging and parameter estimation. The analysis revealed particular importance of the individuals' shell size, height above ground, the shell colouration pattern and the interaction height×orientation. Our study showed that a distinct set of behavioural traits and intrinsic characters define the Hsp70 level and that environmental factors and individual features strongly interact.

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The Relative Importance of Biotic and Abiotic Controls on Young Conifer Growth After Fire in the Klamath-Siskiyou Region

Cited by 13 publications

References 65 publications

Predicting conifer establishment post wildfire in mixed conifer forests of the North American Mediterranean‐climate zone

Predicting conifer establishment post wildfire in mixed conifer forests of the North American Mediterranean‐climate zone

The ecology of mixed severity fire regimes in Washington, Oregon, and Northern California

Solar radiation stress in climbing snails: behavioural and intrinsic features define the Hsp70 level in natural populations of Xeropicta derbentina (Pulmonata)

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