A technique for estimating below-stump biomass of mature loblolly pine plantations

Kapeluck, P.R.; Lear, David H. Van

doi:10.1139/x95-039

Cited by 26 publications

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“…The regression method was consequently very often used to develop biomass tables and quantify root system biomass at the stand level [5,14,15,17,18,20,21]. Prediction at this level is reasonably accurate, depending of course on sample quality.…”

Section: Introductionmentioning

confidence: 99%

Belowground biomass and nutrient content in a 47-year-old Douglas-fir plantation

Ranger¹,

Gelhaye²

2001

Ann. For. Sci.

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-Biomass and nutrient content of the root system of a Douglas-fir stand were calculated using the regression technique. Nine trees, evenly distributed in the girth classes of the stand, were felled for measurements and sampling. Results were compared to published data. Statistically significant relationships between tree circumference at 1.30 m and root biomass or nutrient content were observed. The root biomass was 58 t of dry matter, which was 18% of the total stand biomass. A linear model characterized the relationships between aerial and belowground biomass of 38 Douglas-fir stands previously described in the literature. This simple relationship is very useful when using estimates of the aerial biomass of a stand to calculate the carbon storage in the belowground compartment. Nutrient concentration in the belowground compartment was lower than in the aerial biomass. However, very fine roots and mycorrhizae were not considered. Contrary to aerial biomass, very few published data were found for belowground biomass, hindering any generalization for the nutrient content of the belowground compartment. Douglas-fir / root system / C sequestration / nutrient content Résumé -Biomasse et minéralomasse de la partie souterraine d'un peuplement de Douglas de 47 ans. La biomasse et le contenu minéral du système racinaire d'un peuplement de Douglas ont été estimés au moyen de régressions, à partir d'un échantillonnage destructif portant sur 9 arbres répartis dans toutes les classes de diamètre à 1,30 m du peuplement. Le résultat a été comparé aux données de la littérature. Il existe des relations statistiquement significatives entre le diamètre à 1,30 m d'un arbre et sa biomasse racinaire ou son contenu en éléments nutritifs. Ces relations conduisent à un modèle prévisionnel. Les résultats indiquent que la biomasse racinaire atteint 58 t de matière sèche dans le peuplement étudié, soit 18 % de la biomasse totale du peuplement. La souche et les grosses racines repré-sentent 89 % de cette biomasse. Un simple modèle linéaire relie la biomasse aérienne et la biomasse souterraine pour 38 peuplements de Douglas décrits dans la littérature, ce qui permet de calculer assez facilement le stockage de carbone dans le compartiment souterrain, connaissant la biomasse aérienne d'un peuplement. Pour ce qui concerne les éléments nutritifs, le compartiment souterrain est globalement relativement plus pauvre que le compartiment aérien, mais les très fines racines voire les mycorhizes n'ont pas été prises en compte dans cette étude. Trop peu de données existent pour généraliser l'information. Douglas / système racinaire / contenu en carbone / minéralomasse Ann. For. Sci. 58 (2001) [423][424][425][426][427][428][429][430] 423

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Section: Introductionmentioning

confidence: 99%

Belowground biomass and nutrient content in a 47-year-old Douglas-fir plantation

Ranger¹,

Gelhaye²

2001

Ann. For. Sci.

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“…In brief, we determined root biomass using a combination of excavation, regression, and coring methods developed by Kapeluck and Van Lear (1995). Coarse-root biomass estimates were generated in four diameter classes (taproot, [5.0, 2.5-5.0, and 0.6-2.5 cm) by applying regressions to a 100% inventory of tree diameters in the mature stand.…”

Section: Methodsmentioning

confidence: 99%

“…Until recently (Petersson and Melin 2010), these estimates have not explicitly accounted for C stored in decaying root systems, although down dead wood has included stumps and roots of harvested trees in some studies (e.g., Woodbury et al 2007;Smith and Heath 2008). Because of the laborious nature of root sampling (e.g., Kapeluck and Van Lear 1995), the quantity and fate of C stored in decaying coarse roots are not well studied. Decaying roots of harvested trees, before they are fully decomposed and incorporated into the soil, are part of the belowground detritus carbon pool and should be explicitly accounted for.…”

Section: Introductionmentioning

confidence: 99%

Accounting Carbon Storage in Decaying Root Systems of Harvested Forests

Wang

Lear

Kapeluck

2011

AMBIO

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Decaying root systems of harvested trees can be a significant component of belowground carbon storage, especially in intensively managed forests where harvest occurs repeatedly in relatively short rotations. Based on destructive sampling of root systems of harvested loblolly pine trees, we estimated that root systems contained about 32% (17.2 Mg ha -1 ) at the time of harvest, and about 13% (6.1 Mg ha -1 ) of the soil organic carbon 10 years later. Based on the published roundwood output data, we estimated belowground biomass at the time of harvest for loblolly-shortleaf pine forests harvested between 1995 and 2005 in South Carolina. We then calculated C that remained in the decomposing root systems in 2005 using the decay function developed for loblolly pine. Our calculations indicate that the amount of C stored in decaying roots of loblolly-shortleaf pine forests harvested between 1995 and 2005 in South Carolina was 7.1 Tg. Using a simple extrapolation method, we estimated 331.8 Tg C stored in the decomposing roots due to timber harvest from 1995 to 2005 in the conterminous USA. To fully account for the C stored in the decomposing roots of the US forests, future studies need (1) to quantify decay rates of coarse roots for major tree species in different regions, and (2) to develop a methodology that can determine C stock in decomposing roots resulting from natural mortality.

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“…We used the methods of Kapeluck and Van Lear (1995) to predict the biomass of coarse roots ([5 mm diameter). Essentially, this is a two-step process in which a regression relationship is developed first between individual root diameter and root mass and then between stump D and predicted root mass.…”

Section: Stump and Coarse Root Biomassmentioning

confidence: 99%

“…Roots were excavated using hand tools and a bulldozer with an excavator bucket to lift the stump. Coarse roots were excavated down to a diameter of 5 mm (Kapeluck and Van Lear 1995). After excavation, the roots and stump were washed with water and a stiff brush to remove soil.…”

Section: Stump and Coarse Root Biomassmentioning

confidence: 99%

Allometric models for predicting above- and belowground biomass of Leucaena-KX2 in a shaded coffee agroecosystem in Hawaii

Youkhana

Idol

2011

Agroforest Syst

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We developed site-specific allometric models for Leucaena leucocephala 9 pallida var. KX2 trees in a shaded coffee agroecosystem in Hawaii to predict above-and belowground biomass and the regrowth potential of pollarded trees. Models were used to compare tree growth rates in an experimental agroforestry system with different pollarding frequencies and additions of tree pruning residues as mulch. For all allometric equations, a simple power model (Y = aX b ) provided the optimal prediction of biomass or regrowth after pollarding. For aboveground biomass components (stem, branches, leaves, and seed and pods), stem diameter alone was the best predictor variable. Stump diameter provided the best prediction of coarse root biomass and aboveground regrowth after pollarding. Predictions of biomass from generalized allometric models often fell outside the 95% confidence intervals of our site-specific models, especially as biomass increased. The combination of pollarding trees once per year plus the addition of tree mulch resulted in the greatest aboveground regrowth rates as well as accumulation of biomass and C in the stump plus coarse roots. Although optimal prediction required the development of site-specific allometric relationships, a simple power model using stem or stump diameter alone can provide an accurate assessment of above-and belowground tree biomass, as well as regrowth potential under specific management scenarios.

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A technique for estimating below-stump biomass of mature loblolly pine plantations

Cited by 26 publications

References 0 publications

Belowground biomass and nutrient content in a 47-year-old Douglas-fir plantation

Belowground biomass and nutrient content in a 47-year-old Douglas-fir plantation

Accounting Carbon Storage in Decaying Root Systems of Harvested Forests

Allometric models for predicting above- and belowground biomass of Leucaena-KX2 in a shaded coffee agroecosystem in Hawaii

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