Identification of representative sampling heights for specific gravity and moisture content in plantation-grown loblolly pine (<i>Pinus taeda</i>)

AntonyFinto,; SchimleckLaurence, R; DanielsRichard, F

doi:10.1139/x2012-009

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…The stem wood and stem bark densities of each stem disk sample were calculated with dry weight and fresh volume. Based on the relationships between the wood and bark density of stem disks and the locations of the stem disk samples (i.e., the distances of the stem disk from tree top), stem wood and stem bark densities at 1.3 m were identified with tree‐level average density (Antony, Schimleck, & Daniels, ).…”

Section: Methodsmentioning

confidence: 99%

Biomass increases attributed to both faster tree growth and altered allometric relationships under long‐term carbon dioxide enrichment at a temperate forest

Kim

Medvigy

Maier

et al. 2020

Global Change Biology

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Increases in atmospheric carbon dioxide (CO2) concentrations are expected to lead to increases in the rate of tree biomass accumulation, at least temporarily. On the one hand, trees may simply grow faster under higher CO2 concentrations, preserving the allometric relations that prevailed under lower CO2 concentrations. Alternatively, the allometric relations themselves may change. In this study, the effects of elevated CO2 (eCO2) on tree biomass and allometric relations were jointly assessed. Over 100 trees, grown at Duke Forest, NC, USA, were harvested from eight plots. Half of the plots had been subjected to CO2 enrichment from 1996 to 2010. Several subplots had also been subjected to nitrogen fertilization from 2005 to 2010. Allometric equations were developed to predict tree height, stem volume, and aboveground biomass components for loblolly pine (Pinus taeda L.), the dominant tree species, and broad‐leaved species. Using the same diameter‐based allometric equations for biomass, it was estimated that plots with eCO2 contained 21% more aboveground biomass, consistent with previous studies. However, eCO2 significantly affected allometry, and these changes had an additional effect on biomass. In particular, P. taeda trees at a given diameter were observed to be taller under eCO2 than under ambient CO2 due to changes in both the allometric scaling exponent and intercept. Accounting for allometric change increased the treatment effect of eCO2 on aboveground biomass from a 21% to a 27% increase. No allometric changes for the nondominant broad‐leaved species were identified, nor were allometric changes associated with nitrogen fertilization. For P. taeda, it is concluded that eCO2 affects allometries, and that knowledge of allometry changes is necessary to accurately compute biomass under eCO2. Further observations are needed to determine whether this assessment holds for other taxa.

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Section: Methodsmentioning

confidence: 99%

Biomass increases attributed to both faster tree growth and altered allometric relationships under long‐term carbon dioxide enrichment at a temperate forest

Kim

Medvigy

Maier

et al. 2020

Global Change Biology

View full text Add to dashboard Cite

show abstract

“…Wet biomass, which includes a variable amount of moisture, can only be determined by field measurements. Some studies found variation in basic density and moisture content from the stump to the top in conifers (Antony et al 2012). Such information is crucial to accurately calculate dry weight biomass and carbon stocks.…”

Section: Introductionmentioning

confidence: 99%

Aboveground tree biomass of Araucaria araucana in southern Chile: measurements and multi-objective optimization of biomass models

Kutchartt¹,

Gayoso²,

Pirotti³

et al. 2021

iForest

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Estimating carbon stocks in wooded systems is crucial to quantify national greenhouse gas balance estimates. However, inaccurate estimates are likely due to the divergent architecture of many species. The monkey puzzle tree Araucaria araucana, with its umbrella-like architecture is a vivid example. This species, often found in monodominant stands at high elevations, is the greatest carbon reservoir in the landscape, hence estimating its carbon storage is crucial. To provide the necessary basis for these estimations, we documented the variation in basic density and moisture content along the stem profile, identified the most suitable biomass estimation models, and quantified biomass allocation for three age ranges. We measured, felled, weighed, and separated trees into three categories: stem wood, stem bark, and foliage (branches + scaly leaves). The log-linear form of the simple allometric equation Y = aX b , based on diameter at breast height as the explanatory variable, covered a large part of the variation and showed good cross-validation performance (>0.96). Models using more covariates achieved lower absolute errors, but the estimation of the additional model parameters was associated with greater uncertainty. A multi-objective model comparison revealed that the best additional covariate to further improve biomass estimation was total tree height. The mean absolute percentage error was 9.8% for the total aboveground biomass, 8% for stem wood, 12% for stem bark and 24% for foliage. Changes in biomass distribution among tree components were related to age. For older trees, there was a relative increase in stem wood, a decreased proportion of foliage, but no change in stem bark. The proportion of stem bark biomass is similar to that of Araucaria angustifolia, but higher than in other conifers and most trees in general. Our results provide key properties for A. araucana and general guidance for the selection of easily-measurable variables allowing for excellent predictive power for local biomass estimation.

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Exploration of seasonal moisture variation in standing loblolly and slash pine using time domain reflectometry

et al. 2019

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Identification of representative sampling heights for specific gravity and moisture content in plantation-grown loblolly pine (Pinus taeda)

Cited by 7 publications

References 6 publications

Biomass increases attributed to both faster tree growth and altered allometric relationships under long‐term carbon dioxide enrichment at a temperate forest

Biomass increases attributed to both faster tree growth and altered allometric relationships under long‐term carbon dioxide enrichment at a temperate forest

Aboveground tree biomass of Araucaria araucana in southern Chile: measurements and multi-objective optimization of biomass models

Exploration of seasonal moisture variation in standing loblolly and slash pine using time domain reflectometry

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