Models for predicting above-ground biomass of <i>Betula pubescens</i> spp. <i>czerepanóvii</i> in mountain areas of southern Norway

Bollandsås, Ole Martin; Rekstad, Ingvild; Næsset, Erik; Røsberg, Ingvald

doi:10.1080/02827580903117412

Cited by 10 publications

(7 citation statements)

References 22 publications

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“…Biomass kg qq q q q q q q q q q q q qq q q q q q qq q q q q q q q q q q q qq q qq q q q q q q q qq q Measured biomass Estimated biomass Figure A1. Biomass of birch stems directly measured (stem diameter < 50 mm) or estimated from published relationships (stem diameter > 50 mm) for mountain birch in alpine areas of southern Norway (Bollandsås et al, 2009). Figure A4.…”

Section: Discussionmentioning

confidence: 99%

“…A1). The biomass of birch with stem diameter over 50 mm was estimated using the published relationship between biomass and diameter at breast height of mountain birch in mountain areas within the same region (Bollandsås et al, 2009). To estimate the stand age, we used the 75 % quantile of the age (estimated from the relationship between stem diameter and age) of all birch in each plot.…”

Section: Birchmentioning

confidence: 99%

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Continuous and discontinuous variation in ecosystem carbon stocks with elevation across a treeline ecotone

et al. 2015

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Abstract. Treelines differentiate vastly contrasting ecosystems: open tundra from closed forest. Treeline advance has implications for the climate system due to the impact of the transition from tundra to forest ecosystem on carbon (C) storage and albedo. Treeline advance has been seen to increase above-ground C stocks as low vegetation is replaced with trees but decrease organic soil C stocks as old carbon is decomposed. However, studies comparing across the treeline typically do not account for elevational variation within the ecotone. Here we sample ecosystem C stocks along an elevational gradient (970 to 1300 m), incorporating a large-scale and long-term livestock grazing experiment, in the southern Norwegian mountains. We investigate whether there are continuous or discontinuous changes in C storage across the treeline ecotone, and whether these are modulated by grazing. We find that vegetation C stock decreases with elevation, with a clear breakpoint between the forest line and treeline above which the vegetation C stock is constant. C stocks in organic surface horizons of the soil were higher above the treeline than in the forest, whereas C stocks in mineral soil horizons are unrelated to elevation. Total ecosystem C stocks also showed a discontinuous elevational pattern, increasing with elevation above the treeline (8 g m −2 per metre increase in elevation), but decreasing with elevation below the forest line (−15 g m −2 per metre increase in elevation), such that ecosystem C storage reaches a minimum between the forest line and treeline. We did not find any effect of short-term (12 years) grazing on the elevational patterns. Our findings demonstrate that patterns of C storage across the treeline are complex, and should be taken account of when estimating ecosystem C storage with shifting treelines.

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Section: Discussionmentioning

confidence: 99%

Section: Birchmentioning

confidence: 99%

Continuous and discontinuous variation in ecosystem carbon stocks with elevation across a treeline ecotone

et al. 2015

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“…Biomass of birch stems directly measured (stem diameter < 50 mm) or estimated from published relationships (stem diameter > 50 mm) for mountain birch in alpine areas of southern Norway(Bollandsås et al, 2009). …”

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confidence: 99%

Continuous and discontinuous variation in ecosystem carbon stocks with elevation across a treeline ecotone

Speed¹,

Martinsen²,

Hester³

et al. 2014

Preprint

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Abstract. Treelines differentiate vastly contrasting ecosystems: open tundra from closed forest. Treeline advance has implications for the climate system due to the impact of the transition from tundra to forest ecosystem on carbon (C) storage and albedo. Treeline advance has been seen to increase above-ground C stocks as low vegetation is replaced with trees, but decrease organic soil C stocks as old carbon is decomposed. However, studies comparing across the treeline typically do not account for elevational variation within the ecotone. Here we sample ecosystem C stocks along an elevational gradient (970 to 1300 m), incorporating a large-scale and long-term livestock grazing experiment, in the Southern Norwegian mountains. We investigate whether there are continuous or discontinuous changes in C storage across the treeline ecotone, and whether these are modulated by grazing. We find that vegetation C stock decreases with elevation, with a clear breakpoint between the forest line and treeline above which the vegetation C stock is constant. In contrast, C stocks in organic surface horizons of the soil increase linearly with elevation within the study's elevational range, whereas C stocks in mineral soil horizons are unrelated to elevation. Total ecosystem C stocks also showed a discontinuous elevational pattern, increasing with elevation above the treeline (8 g m−2 m−1 increase in elevation), but decreasing with elevation below the forest line (−15 g m−2 m−1 increase in elevation), such that ecosystem C storage reaches a minimum between the forest line and treeline. We did not find any effect of short-term (12 years) grazing on the elevational patterns. Our findings demonstrate that patterns of C storage across the treeline are complex, and should be taken account of when estimating ecosystem C storage with shifting treelines.

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“…5 for the approximation of the relationship between tree dimensions and tree biomass, which is the equation which has been repeatedly found suitable for tree biomass estimation (cienciala et al 2008;Hochbichler et al 2006;Bollandsås et al 2009): where Y is biomass of a tree compartment; a, b 1 -b n are estimated parameters, X 1 -X n are predictors (tree height and diameter in the current study), and ε is the error term.…”

Section: Statistical Analysesmentioning

confidence: 99%

Functions for the aboveground woody biomass in Small-leaved lime (Tilia cordata Mill.) / Funkce pro hodnocení biomasy nadzemních částí lípy malolisté (Tilia cordata Mill.)

Čihák¹,

Hlásny²,

Stolariková³

et al. 2014

Forestry Journal

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The Small-leaved lime (Tilia cordata Mill.) is currently not commercially important species, therefore the knowledge of biomass partitioning in a tree is rather incomplete. Moreover, lime biomass is estimated mostly using biomass functions designated for other species, without the knowledge of limits of such a use. For these reasons, we developed functions for the estimation of lime biomass in the aboveground woody parts. The functions were parameterized using 81 tree samples collected in two plots in the czech republic. in addition, we compared the biomass estimates produced by our functions with estimates produced by a function for beech, which have been obviously used as a surrogate for missing lime models in the czech republic and Slovakia.on average, 78% of lime aboveground biomass was found to account for tree stem, 20% for branches and 2% for stump. average biomass density was 374 kg m −3 and no significant differences between tree compartments were found. accuracy of all models in terms of the root Mean Square error (rMSe) significantly differed between tree diameter classes; in case of total aboveground biomass, the rMSe was ca. 20% of the average biomass weight in a given class up to a diameter of 45 cm, and then it rose sharply. The rMSe was higher in case of compartments with variable dimensions, such as branches and stump. rMSe was slightly higher in case of estimates produced using a beech-specific function than using that developed in the current study (average rMSe 27.95 and 29.42%, respectively); at the same time, beech-specific function overestimated lime stem biomass by ca 12%. The almost equal rMSe implies the usability of both parameterisations for lime biomass estimation, though the correction of the mentioned overestimation should be applied. Key words: biomass weight and volume; wood density; temperate forests; tree compartments Abstrakt lípa malolistá (Tilia cordata Mill.) v současnosti nepředstavuje hospodářsky významnou dřevinu, což je jeden z důvodů proč jsou poznatky o distribuci její biomasy v rámci stromu značně nekompletní. Kromě toho, biomasa lípy je většinou hodnocená pomocí rovnic navrhnutých pro jiné dřeviny, přičemž možné nedostatky tohoto postupu jsou ve značné míře neznámé. Z těchto důvodů jsme na základě údajů zís-kaných z 81 stromů na dvou plochách v České republice vytvořili parametrizace rovnic pro odhad dřevnatých částí nadzemní biomasy lípy. následně jsme porovnali odhady objemu biomasy lípy získané pomocí námi navrhnutých modelů s odhadem získaným modelem parametrizovaným pro buk, který je v České republice a na Slovensku pro hodnocení biomasy lípy obvykle používaný.v průměru připadalo 78% nadzemní biomasy na kmen stromu, 20% na korunu a 2% na pařez. Průměrná hustota biomasy činila 374 kg na m −3 a nebyl zjištěn signifikantní rozdíl mezi hustotou jednotlivých kompartmentů. Přesnost všech modelů v intencích procentuální rMSe (root Mean Square error) byla vyšší do tloušťkové třídy 45 cm, následně se zhoršila. v případě celkové nadzemní biomasy se pohybovala kol...

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Models for predicting above-ground biomass of Betula pubescens spp. czerepanóvii in mountain areas of southern Norway

Cited by 10 publications

References 22 publications

Continuous and discontinuous variation in ecosystem carbon stocks with elevation across a treeline ecotone

Continuous and discontinuous variation in ecosystem carbon stocks with elevation across a treeline ecotone

Continuous and discontinuous variation in ecosystem carbon stocks with elevation across a treeline ecotone

Functions for the aboveground woody biomass in Small-leaved lime (Tilia cordata Mill.) / Funkce pro hodnocení biomasy nadzemních částí lípy malolisté (Tilia cordata Mill.)

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