Microfibril angle and density patterns of fertilized and irrigated Norway spruce

Lundgren, Christina

doi:10.14214/sf.439

Cited by 31 publications

(30 citation statements)

References 19 publications

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“…This is because of the fact that agricultural land usually contains a greater quantity (usually artificially supplied) of nutrients that result in a faster growth, which is reflected in the larger annual ring width, and thus for conifers, it is accompanied by a decrease in the density of such wood. This fact is confirmed by studies evaluating the effect of artificial fertilization of forest growth (analogy of nutrient delivery to agricultural crops) on wood properties, where it is clearly demonstrated that higher nutrient intake corresponds to a decrease in density and strength of the spruce, pine or the Douglas fir [34][35][36]. However, this may not be the norm, as proven by Bartoš [20] for spruce wood in the Czech Republic, and wood from such sites need not be regarded as less valuable.…”

Section: Discussionmentioning

confidence: 70%

Comparison of Wood Quality of Douglas Fir and Spruce from Afforested Agricultural Land and Permanent Forest Land in the Czech Republic

Zeidler¹,

Borůvka²,

Schönfelder³

2017

Forests

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This study compares the quality of wood from two distinct sites in the Czech Republic-from former afforested agricultural land and forest land. We compared the properties of Norway spruce wood (Picea abies Karst.) and Scots pine wood (Pinus sylvestris L.), the most important domestic tree species, to Douglas fir (Pseudotsuga menziesii (Mirbel) Franco), a North American tree species and a potential substitute for the domestic spruce. Wood density, modulus of elasticity (MOE), modulus of rupture (MOR) and impact bending strength were the properties tested that were used for comparing tree species. Without taking into consideration the site, the highest density values from the tested tree species were obtained for Douglas fir (0.568 g·cm −3 ), followed by the pine (0.508 g·cm −3 ) and the spruce (0.463 g·cm −3 ). The Douglas fir also dominated in the remaining assessed properties, whilst the influence of site was not confirmed, with the exception of MOE and MOR, and only for the Douglas fir wood, wherein higher values were obtained for forest land. In terms assessed Douglas fir properties, it exceeds the domestic softwoods and represents a possible suitable replacement for them. The site only plays a role in terms of the Douglas fir, and only for certain properties.

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Section: Discussionmentioning

confidence: 70%

Comparison of Wood Quality of Douglas Fir and Spruce from Afforested Agricultural Land and Permanent Forest Land in the Czech Republic

Zeidler¹,

Borůvka²,

Schönfelder³

2017

Forests

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“…At an interannual scale, wood density variations can be substantial. There were several reports that (annual) ring density decreases with increasing ring width, for instance in Norway spruce (Bergqvist, 1998;Dutilleul et al, 1998;Lundgren, 2004;Bouriaud et al, 2005;Franceschini et al, 2010Franceschini et al, , 2013. Wood density was also proved to vary between trees (Wilhelmsson et al, 2002;Guilley et al, 2004), a fact which is never accounted for in studies using diameter surveys to produce biomass increment estimations.…”

Section: O Bouriaud Et Al: Influence Of Wood Density On Productivitymentioning

confidence: 99%

Influence of wood density in tree-ring-based annual productivity assessments and its errors in Norway spruce

et al. 2015

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Abstract. Estimations of tree annual biomass increments are used by a variety of studies related to forest productivity or carbon fluxes. Biomass increment estimations can be easily obtained from diameter surveys or historical diameter reconstructions based on tree rings' records. However, the biomass models rely on the assumption that wood density is constant. Converting volume increment into biomass also requires assumptions about the wood density. Wood density has been largely reported to vary both in time and between trees. In Norway spruce, wood density is known to increase with decreasing ring width. This could lead to underestimating the biomass or carbon deposition in bad years. The variations between trees of wood density have never been discussed but could also contribute to deviations. A modelling approach could attenuate these effects but will also generate errors.Here a model of wood density variations in Norway spruce, and an allometric model of volume growth were developed. We accounted for variations in wood density both between years and between trees, based on specific measurements. We compared the effects of neglecting each variation source on the estimations of annual biomass increment. We also assessed the errors of the biomass increment predictions at tree level, and of the annual productivity at plot level.Our results showed a partial compensation of the decrease in ring width in bad years by the increase in wood density. The underestimation of the biomass increment in those years reached 15 %. The errors related to the use of an allometric model of volume growth were modest, around ±15 %. The errors related to variations in wood density were much larger, the biggest component being the inter-tree variability. The errors in plot-level annual biomass productivity reached up to 40 %, with a full account of all the error sources.

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“…(Yang and Evans 2003), Picea abies (L.) Karst. (Lundgren 2004, Piispanen et al 2014, Pinus taeda L. (Jordan et al 2005), Pseudotsuga menziesii (Mirb.) Franco (Vikram et al 2011), Pinus sylvestris L. (Auty et al 2013) and Pinus radiata D.Don (Ivković et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Radial variation in selected wood properties of three cypress taxa

Todoroki

Low

McKenzie³

et al. 2015

N.Z. j. of For. Sci.

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Background: New Zealand-grown cypresses are typically harvested at 35-40 years of age; however, shorter rotations have been proposed. The objective of this study was to evaluate the feasibility of producing structural products from shorter rotations through examination of wood properties of younger cypress trees. A detailed examination of radial wood property trends was necessary, and the first ring-level models for three cypress taxa were developed because there were no predictive wood property models available.

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Microfibril angle and density patterns of fertilized and irrigated Norway spruce

Cited by 31 publications

References 19 publications

Comparison of Wood Quality of Douglas Fir and Spruce from Afforested Agricultural Land and Permanent Forest Land in the Czech Republic

Comparison of Wood Quality of Douglas Fir and Spruce from Afforested Agricultural Land and Permanent Forest Land in the Czech Republic

Influence of wood density in tree-ring-based annual productivity assessments and its errors in Norway spruce

Radial variation in selected wood properties of three cypress taxa

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