Influence of thinning and burning restoration treatments on presettlement ponderosa pines at the Gus Pearson Natural Area

Feeney, Shelly R.; Kolb, Thomas E.; Covington, W. Wallace; Wagner, Michael R.

doi:10.1139/cjfr-28-9-1295

Cited by 71 publications

(136 citation statements)

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“…In the medium term, from 1 to 4 years after prescribed burning, we found no variation in needle flavonol contents. Similar results on primary metabolism have been reported for pine forests from 1 to 16 years after prescribed burnings (Feeney et al 1998;Wallin et al 2004;Sala et al 2005;Zausen et al 2005). …”

Section: Total Flavonols (Mg G-1)supporting

confidence: 85%

“…Prescribed burning of pine stands is used widely in the United States and South Africa (Carter andFoster 2004, De Ronde 1983) and to a lesser extent in the Mediterranean regions of Portugal (Fernandes and Botelho 2004) and France (Rigolot 2000). Several studies have investigated the effects of prescribed burning on pine physiology (Feeney et al 1998;Alonso et al 2002;Wallin et al 2004;Cannac et al 2007). These previous studies have reached disparate conclusions, largely due to differences in study variables such as stand density and age; fire intensity, severity, and recurrence; season; geographic location; and climate.…”

Section: Introductionmentioning

confidence: 99%

“…These previous studies have reached disparate conclusions, largely due to differences in study variables such as stand density and age; fire intensity, severity, and recurrence; season; geographic location; and climate. Several research groups have detected increases in foliar nitrogen, carbon isotope discrimination (d 13 C) or photosynthesis after prescribed burning or other types of fires (Fleck et al 1996;Feeney et al 1998;Alonso et al 2002;Wallin et al 2004), while others have found decreases (Fleck et al 1996;Wallin et al 2004) or no change (Sala et al 2005;Zausen et al 2005). The effect of fire recurrence is a matter of major interest to forest managers seeking to optimise the time interval between consecutive burning operations, in order to cause minimal stress to the trees.…”

Section: Introductionmentioning

confidence: 99%

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Identification of flavonoids in Pinus Laricio needles and changes occurring after prescribed burning

et al. 2010

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Prescribed burning is increasingly being used as a fire prevention tool in forest management; however, it can cause thermal stress to trees. Its effects on pine physiology have been poorly understood. Flavonoids are highly indicative of plants' responses to environmental stress, and in this study, we used flavonoid concentrations in pine needles to assess fire impact on a Corsican Pinus laricio Poir. forest up to 4 years after prescribed burning. This is the first study that highlighted the presence of flavonols in P. laricio and indicated kaempferol to be the major compound. The total flavonol content increased by 60% 3 months after 1 or 2 prescribed low-intensity burnings and returned to the pre-burning level after 1 year. This suggests that thermal stress events caused defensive production of flavonoids. Prescribed burnings performed at 3-year intervals did not appear to alter flavonoid levels. In the light of these findings, forest managers may consider the use of prescribed burning at 3-year intervals as a means to reduce fuel loads, while minimizing the impact on P. laricio.

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Section: Total Flavonols (Mg G-1)supporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of flavonoids in Pinus Laricio needles and changes occurring after prescribed burning

et al. 2010

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“…1a, 2a). Increases in W pre in both studies were consistent with increases in thinned and thinned and burned ponderosa pine stands compared with unthinned stands on other study sites in northern Arizona (Feeney et al 1998;Kolb et al 1998;Skov et al 2004). Differences in W pre between thinned and unthinned stands were more pronounced in Study II than Study I (Figs.…”

Section: Discussionsupporting

confidence: 75%

“…and Weins) by measuring host tree physiological status in thinned and unthinned stands coupled with measurements of mistletoe shoot growth. Much research has shown that forest thinning increases water and carbon uptake of ponderosa pine (Feeney et al 1998;Kolb et al 1998;Latham and Tappeiner 2002;McDowell et al 2003;Skov et al 2004). We hypothesized that forest thinning would increase resource uptake by host trees, which in turn would increase resources to the dwarf mistletoes and stimulate mistletoe shoot growth.…”

Section: Introductionmentioning

confidence: 99%

Host physiological condition regulates parasitic plant performance: Arceuthobium vaginatum subsp. cryptopodum on Pinus ponderosa

2005

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Much research has focused on effects of plant parasites on host-plant physiology and growth, but little is known about effects of host physiological condition on parasite growth. Using the parasitic dwarf mistletoe Arceuthobium vaginatum subsp. cryptopodum (Viscaceae) and its host Pinus ponderosa, we investigated whether changes in host physiological condition influenced mistletoe shoot development in northern Arizona forests. We conducted two studies in two consecutive years and used forest thinning (i.e., competitive release) to manipulate host physiological condition. We removed dwarf mistletoe shoots in April, before the onset of the growing season, and measured the amount of regrowth in the first season after forest thinning (Study I: n=38 trees; Study II: n=35 trees). Thinning increased tree uptake of water and carbon in both studies, but had no effect on leaf N concentration or delta13C. Mistletoe shoot growth was greater on trees with high uptake of water and carbon in thinned stands than trees with low uptake in unthinned stands. These findings show that increased resource uptake by host trees increases resources to these heterotrophic dwarf mistletoes, and links mistletoe performance to changes in host physiological condition.

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Forest restoration treatments have subtle long‐term effects on soil C and N cycling in mixed conifer forests

Ganzlin

Gundale

Becknell

et al. 2016

Ecological Applications

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Decades of fire suppression following extensive timber harvesting have left much of the forest in the intermountain western United States exceedingly dense, and forest restoration techniques (i.e., thinning and prescribed fire) are increasingly being used in an attempt to mitigate the effects of severe wildfire, to enhance tree growth and regeneration, and to stimulate soil nutrient cycling. While many of the short-term effects of forest restoration have been established, the long-term effects on soil biogeochemical and ecosystem processes are largely unknown. We assessed the effects of commonly used forest restoration treatments (thinning, burning, and thinning + burning) on nutrient cycling and other ecosystem processes 11 yr after restoration treatments were implemented in a ponderosa pine (Pinus ponderosa var. scopulorum)/Douglas fir (Pseudotsuga menziesii var. glauca) forest at the Lubrecht Fire and Fire Surrogates Study (FFS) site in western Montana, USA. Despite short-term (<3 yr) increases in soil inorganic nitrogen (N) pools and N cycling rates following prescribed fire, long-term soil N pools and N mineralization rates showed only subtle differences from untreated control plots. Similarly, despite a persistent positive correlation between fuels consumed in prescribed burns and several metrics of N cycling, variability in inorganic N pools decreased significantly since treatments were implemented, indicating a decline in N spatial heterogeneity through time. However, rates of net nitrification remain significantly higher in a thin + burn treatment relative to other treatments. Short-term declines in forest floor carbon (C) pools have persisted in the thin + burn treatment, but there were no significant long-term differences among treatments in extractable soil phosphorus (P). Finally, despite some short-term differences, long-term foliar nutrient concentrations, litter decomposition rates, and rates of free-living N fixation in the experimental plots were not different from control plots, suggesting nutrient cycles and ecosystem processes in temperate coniferous forests are resilient to disturbance following long periods of fire suppression. Overall, this study provides forest managers and policymakers valuable information showing that the effects of these commonly used restoration prescriptions on soil nutrient cycling are ephemeral and that use of repeated treatments (i.e., frequent fire) will be necessary to ensure continued restoration success.

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Influence of thinning and burning restoration treatments on presettlement ponderosa pines at the Gus Pearson Natural Area

Cited by 71 publications

References 0 publications

Identification of flavonoids in Pinus Laricio needles and changes occurring after prescribed burning

Identification of flavonoids in Pinus Laricio needles and changes occurring after prescribed burning

Host physiological condition regulates parasitic plant performance: Arceuthobium vaginatum subsp. cryptopodum on Pinus ponderosa

Forest restoration treatments have subtle long‐term effects on soil C and N cycling in mixed conifer forests

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