The Experts below are selected from a list of 11304 Experts worldwide ranked by ideXlab platform
Cornelia Krause - One of the best experts on this subject based on the ideXlab platform.
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Wood properties of black spruce (Picea mariana (Mill.) BSP) in relation to ring width and tree height in even- and Uneven-Aged boreal Stands
Annals of Forest Science, 2019Co-Authors: Émilie Pamerleau-couture, David Pothier, Sergio Rossi, Cornelia KrauseAbstract:Abstract•Key MessageWood properties were generally similar in unmanaged even-aged and Uneven-Aged black spruce Stands. In contrast, in managed forests, wood density was higher in even-aged than in Uneven-Aged Stands. As ring width is the discriminant factor, forest management should regulate the intensity of partial cutting to maintain a high wood density.•ContextNorth American boreal forests experience recurrent disturbances, such as fire and insect outbreaks, that shape the structure of even-aged and Uneven-Aged Stands. Ecosystem-based forest management practices, such as partial cutting, aim to increase timber yields, and these forest harvesting approaches are being applied more frequently. Although the influence of these practices on tree growth is well known, few studies have examined their impact on anatomy and density of the resulting wood.•AimThis research studied the relationships between wood properties and ring width and tree heights in even- and Uneven-Aged black spruce (Picea mariana (Mill.) BSP) Stands and how these relationships are modified following partial cutting.•MethodWood density (ring, earlywood, latewood, and maximum density) and anatomical traits (lumen area, cell-wall thickness, and tracheid length) were measured at breast height on the stem of black spruce trees. The measured wood properties were then correlated with ring width and stem height.•ResultsThe model demonstrated significant correlations between most measured wood parameters and ring width with only small differences between even- and Uneven-Aged unmanaged Stands. Five wood properties were influenced by tree height in even-aged and Uneven-Aged unmanaged plots. Partial cutting increased the number of significant relationships between wood properties (ring, latewood, maximum density, early- and latewood lumen area, tracheid length) and tree height. We detected differences in wood properties between even- and Uneven-Aged plots. Although we detected no change in average ring density, the variation of intra-annual density increased, due to changes in earlywood and latewood density that resulted in more heterogeneous rings.•ConclusionPartial cutting should take into consideration the age structure of the stand when the density of wood products matters.
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effect of three partial cutting practices on stand structure and growth of residual black spruce trees in north eastern quebec
Forestry, 2015Co-Authors: Emilie Pamerleaucouture, Cornelia Krause, David Pothier, Aaron R WeiskittelAbstract:Partial cutting practices are increasingly used in boreal forests for two major reasons: (1) maintaining age structure and tree diameter distribution according to the principles of ecosystem-based management and (2) increasing tree growth by decreasing competition. This study evaluated the effects of three different partial cutting treatments applied to evenand Uneven-Aged black spruce (Picea mariana (Mill.) B.S.P.) Stands in north-eastern Quebec, Canada. The effect of partial cutting was assessed by comparing treated and control plots in terms of age structure, diameter and spatial distribution, amount of deadwood and tree radial growth. Age structure and diameter distribution were not different from control plots after partial cuttings applied in both unevenaged and even-aged Stands, but lower deadwood basal area was observed. Tree radial growth generally increased in Uneven-Aged Stands but can be limited by tree age and inter-tree competition. In even-aged Stands, tree removal wasmore uniformly distributed and the overall reduction in inter-tree competition resulted in an increased tree radial growth. Overall, these results suggest that the studied partial cuttings were adequate for maintaining structural attributes and increasing tree growth, but adjustments should be made to treatments to increase the amount of deadwood to a level observed in natural forests and to lower inter-tree competition.
Michael G. Harrington - One of the best experts on this subject based on the ideXlab platform.
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physiological responses of ponderosa pine in western montana to thinning prescribed fire and burning season
Tree Physiology, 2005Co-Authors: Anna Sala, Lorna R Mcintyre, Gregory D Peters, Michael G. HarringtonAbstract:: Low-elevation ponderosa pine (Pinus ponderosa Dougl. ex. Laws.) forests of the northern Rocky Mountains historically experienced frequent low-intensity fires that maintained open Uneven-Aged Stands. A century of fire exclusion has contributed to denser ponderosa pine forests with greater competition for resources, higher tree stress and greater risk of insect attack and stand-destroying fire. Active management intended to restore a semblance of the more sustainable historic stand structure and composition includes selective thinning and prescribed fire. However, little is known about the relative effects of these management practices on the physiological performance of ponderosa pine. We measured soil water and nitrogen availability, physiological performance and wood radial increment of second growth ponderosa pine trees at the Lick Creek Experimental Site in the Bitterroot National Forest, Montana, 8 and 9 years after the application of four treatments: thinning only; thinning followed by prescribed fire in the spring; thinning followed by prescribed fire in the fall; and untreated controls. Volumetric soil water content and resin capsule ammonium did not differ among treatments. Resin capsule nitrate in the control treatment was similar to that in all other treatments, although burned treatments had lower nitrate relative to the thinned-only treatment. Trees of similar size and canopy condition in the three thinned treatments (with and without fire) displayed higher leaf-area-based photosynthetic rate, stomatal conductance and mid-morning leaf water potential in June and July, and higher wood radial increment relative to trees in control units. Specific leaf area, mass-based leaf nitrogen content and carbon isotope discrimination did not vary among treatments. Our results suggest that, despite minimal differences in soil resource availability, trees in managed units where basal area was reduced had improved gas exchange and growth compared with trees in unmanaged units. Prescribed fire (either in the spring or in the fall) in addition to thinning, had no measurable effect on the mid-term physiological performance and wood growth of second growth ponderosa pine.
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physiological responses of ponderosa pine in western montana to thinning prescribed fire and burning season
Tree Physiology, 2005Co-Authors: Anna Sala, Lorna R Mcintyre, Gregory D Peters, Michael G. HarringtonAbstract:: Low-elevation ponderosa pine (Pinus ponderosa Dougl. ex. Laws.) forests of the northern Rocky Mountains historically experienced frequent low-intensity fires that maintained open Uneven-Aged Stands. A century of fire exclusion has contributed to denser ponderosa pine forests with greater competition for resources, higher tree stress and greater risk of insect attack and stand-destroying fire. Active management intended to restore a semblance of the more sustainable historic stand structure and composition includes selective thinning and prescribed fire. However, little is known about the relative effects of these management practices on the physiological performance of ponderosa pine. We measured soil water and nitrogen availability, physiological performance and wood radial increment of second growth ponderosa pine trees at the Lick Creek Experimental Site in the Bitterroot National Forest, Montana, 8 and 9 years after the application of four treatments: thinning only; thinning followed by prescribed fire in the spring; thinning followed by prescribed fire in the fall; and untreated controls. Volumetric soil water content and resin capsule ammonium did not differ among treatments. Resin capsule nitrate in the control treatment was similar to that in all other treatments, although burned treatments had lower nitrate relative to the thinned-only treatment. Trees of similar size and canopy condition in the three thinned treatments (with and without fire) displayed higher leaf-area-based photosynthetic rate, stomatal conductance and mid-morning leaf water potential in June and July, and higher wood radial increment relative to trees in control units. Specific leaf area, mass-based leaf nitrogen content and carbon isotope discrimination did not vary among treatments. Our results suggest that, despite minimal differences in soil resource availability, trees in managed units where basal area was reduced had improved gas exchange and growth compared with trees in unmanaged units. Prescribed fire (either in the spring or in the fall) in addition to thinning, had no measurable effect on the mid-term physiological performance and wood growth of second growth ponderosa pine.
David Pothier - One of the best experts on this subject based on the ideXlab platform.
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Wood properties of black spruce (Picea mariana (Mill.) BSP) in relation to ring width and tree height in even- and Uneven-Aged boreal Stands
Annals of Forest Science, 2019Co-Authors: Émilie Pamerleau-couture, David Pothier, Sergio Rossi, Cornelia KrauseAbstract:Abstract•Key MessageWood properties were generally similar in unmanaged even-aged and Uneven-Aged black spruce Stands. In contrast, in managed forests, wood density was higher in even-aged than in Uneven-Aged Stands. As ring width is the discriminant factor, forest management should regulate the intensity of partial cutting to maintain a high wood density.•ContextNorth American boreal forests experience recurrent disturbances, such as fire and insect outbreaks, that shape the structure of even-aged and Uneven-Aged Stands. Ecosystem-based forest management practices, such as partial cutting, aim to increase timber yields, and these forest harvesting approaches are being applied more frequently. Although the influence of these practices on tree growth is well known, few studies have examined their impact on anatomy and density of the resulting wood.•AimThis research studied the relationships between wood properties and ring width and tree heights in even- and Uneven-Aged black spruce (Picea mariana (Mill.) BSP) Stands and how these relationships are modified following partial cutting.•MethodWood density (ring, earlywood, latewood, and maximum density) and anatomical traits (lumen area, cell-wall thickness, and tracheid length) were measured at breast height on the stem of black spruce trees. The measured wood properties were then correlated with ring width and stem height.•ResultsThe model demonstrated significant correlations between most measured wood parameters and ring width with only small differences between even- and Uneven-Aged unmanaged Stands. Five wood properties were influenced by tree height in even-aged and Uneven-Aged unmanaged plots. Partial cutting increased the number of significant relationships between wood properties (ring, latewood, maximum density, early- and latewood lumen area, tracheid length) and tree height. We detected differences in wood properties between even- and Uneven-Aged plots. Although we detected no change in average ring density, the variation of intra-annual density increased, due to changes in earlywood and latewood density that resulted in more heterogeneous rings.•ConclusionPartial cutting should take into consideration the age structure of the stand when the density of wood products matters.
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effect of three partial cutting practices on stand structure and growth of residual black spruce trees in north eastern quebec
Forestry, 2015Co-Authors: Emilie Pamerleaucouture, Cornelia Krause, David Pothier, Aaron R WeiskittelAbstract:Partial cutting practices are increasingly used in boreal forests for two major reasons: (1) maintaining age structure and tree diameter distribution according to the principles of ecosystem-based management and (2) increasing tree growth by decreasing competition. This study evaluated the effects of three different partial cutting treatments applied to evenand Uneven-Aged black spruce (Picea mariana (Mill.) B.S.P.) Stands in north-eastern Quebec, Canada. The effect of partial cutting was assessed by comparing treated and control plots in terms of age structure, diameter and spatial distribution, amount of deadwood and tree radial growth. Age structure and diameter distribution were not different from control plots after partial cuttings applied in both unevenaged and even-aged Stands, but lower deadwood basal area was observed. Tree radial growth generally increased in Uneven-Aged Stands but can be limited by tree age and inter-tree competition. In even-aged Stands, tree removal wasmore uniformly distributed and the overall reduction in inter-tree competition resulted in an increased tree radial growth. Overall, these results suggest that the studied partial cuttings were adequate for maintaining structural attributes and increasing tree growth, but adjustments should be made to treatments to increase the amount of deadwood to a level observed in natural forests and to lower inter-tree competition.
Anna Sala - One of the best experts on this subject based on the ideXlab platform.
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physiological responses of ponderosa pine in western montana to thinning prescribed fire and burning season
Tree Physiology, 2005Co-Authors: Anna Sala, Lorna R Mcintyre, Gregory D Peters, Michael G. HarringtonAbstract:: Low-elevation ponderosa pine (Pinus ponderosa Dougl. ex. Laws.) forests of the northern Rocky Mountains historically experienced frequent low-intensity fires that maintained open Uneven-Aged Stands. A century of fire exclusion has contributed to denser ponderosa pine forests with greater competition for resources, higher tree stress and greater risk of insect attack and stand-destroying fire. Active management intended to restore a semblance of the more sustainable historic stand structure and composition includes selective thinning and prescribed fire. However, little is known about the relative effects of these management practices on the physiological performance of ponderosa pine. We measured soil water and nitrogen availability, physiological performance and wood radial increment of second growth ponderosa pine trees at the Lick Creek Experimental Site in the Bitterroot National Forest, Montana, 8 and 9 years after the application of four treatments: thinning only; thinning followed by prescribed fire in the spring; thinning followed by prescribed fire in the fall; and untreated controls. Volumetric soil water content and resin capsule ammonium did not differ among treatments. Resin capsule nitrate in the control treatment was similar to that in all other treatments, although burned treatments had lower nitrate relative to the thinned-only treatment. Trees of similar size and canopy condition in the three thinned treatments (with and without fire) displayed higher leaf-area-based photosynthetic rate, stomatal conductance and mid-morning leaf water potential in June and July, and higher wood radial increment relative to trees in control units. Specific leaf area, mass-based leaf nitrogen content and carbon isotope discrimination did not vary among treatments. Our results suggest that, despite minimal differences in soil resource availability, trees in managed units where basal area was reduced had improved gas exchange and growth compared with trees in unmanaged units. Prescribed fire (either in the spring or in the fall) in addition to thinning, had no measurable effect on the mid-term physiological performance and wood growth of second growth ponderosa pine.
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physiological responses of ponderosa pine in western montana to thinning prescribed fire and burning season
Tree Physiology, 2005Co-Authors: Anna Sala, Lorna R Mcintyre, Gregory D Peters, Michael G. HarringtonAbstract:: Low-elevation ponderosa pine (Pinus ponderosa Dougl. ex. Laws.) forests of the northern Rocky Mountains historically experienced frequent low-intensity fires that maintained open Uneven-Aged Stands. A century of fire exclusion has contributed to denser ponderosa pine forests with greater competition for resources, higher tree stress and greater risk of insect attack and stand-destroying fire. Active management intended to restore a semblance of the more sustainable historic stand structure and composition includes selective thinning and prescribed fire. However, little is known about the relative effects of these management practices on the physiological performance of ponderosa pine. We measured soil water and nitrogen availability, physiological performance and wood radial increment of second growth ponderosa pine trees at the Lick Creek Experimental Site in the Bitterroot National Forest, Montana, 8 and 9 years after the application of four treatments: thinning only; thinning followed by prescribed fire in the spring; thinning followed by prescribed fire in the fall; and untreated controls. Volumetric soil water content and resin capsule ammonium did not differ among treatments. Resin capsule nitrate in the control treatment was similar to that in all other treatments, although burned treatments had lower nitrate relative to the thinned-only treatment. Trees of similar size and canopy condition in the three thinned treatments (with and without fire) displayed higher leaf-area-based photosynthetic rate, stomatal conductance and mid-morning leaf water potential in June and July, and higher wood radial increment relative to trees in control units. Specific leaf area, mass-based leaf nitrogen content and carbon isotope discrimination did not vary among treatments. Our results suggest that, despite minimal differences in soil resource availability, trees in managed units where basal area was reduced had improved gas exchange and growth compared with trees in unmanaged units. Prescribed fire (either in the spring or in the fall) in addition to thinning, had no measurable effect on the mid-term physiological performance and wood growth of second growth ponderosa pine.
Émilie Pamerleau-couture - One of the best experts on this subject based on the ideXlab platform.
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Wood properties of black spruce (Picea mariana (Mill.) BSP) in relation to ring width and tree height in even- and Uneven-Aged boreal Stands
Annals of Forest Science, 2019Co-Authors: Émilie Pamerleau-couture, David Pothier, Sergio Rossi, Cornelia KrauseAbstract:Abstract•Key MessageWood properties were generally similar in unmanaged even-aged and Uneven-Aged black spruce Stands. In contrast, in managed forests, wood density was higher in even-aged than in Uneven-Aged Stands. As ring width is the discriminant factor, forest management should regulate the intensity of partial cutting to maintain a high wood density.•ContextNorth American boreal forests experience recurrent disturbances, such as fire and insect outbreaks, that shape the structure of even-aged and Uneven-Aged Stands. Ecosystem-based forest management practices, such as partial cutting, aim to increase timber yields, and these forest harvesting approaches are being applied more frequently. Although the influence of these practices on tree growth is well known, few studies have examined their impact on anatomy and density of the resulting wood.•AimThis research studied the relationships between wood properties and ring width and tree heights in even- and Uneven-Aged black spruce (Picea mariana (Mill.) BSP) Stands and how these relationships are modified following partial cutting.•MethodWood density (ring, earlywood, latewood, and maximum density) and anatomical traits (lumen area, cell-wall thickness, and tracheid length) were measured at breast height on the stem of black spruce trees. The measured wood properties were then correlated with ring width and stem height.•ResultsThe model demonstrated significant correlations between most measured wood parameters and ring width with only small differences between even- and Uneven-Aged unmanaged Stands. Five wood properties were influenced by tree height in even-aged and Uneven-Aged unmanaged plots. Partial cutting increased the number of significant relationships between wood properties (ring, latewood, maximum density, early- and latewood lumen area, tracheid length) and tree height. We detected differences in wood properties between even- and Uneven-Aged plots. Although we detected no change in average ring density, the variation of intra-annual density increased, due to changes in earlywood and latewood density that resulted in more heterogeneous rings.•ConclusionPartial cutting should take into consideration the age structure of the stand when the density of wood products matters.
