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Articles by Åke Nilsson
Category : Special section
article id 288,
category
Special section
Björn Berg,
Per Gundersen,
Cecilia Akselsson,
Maj-Britt Johansson,
Åke Nilsson,
Lars Vesterdal.
(2007).
Carbon sequestration rates in Swedish forest soils – a comparison of three approaches.
Silva Fennica
vol.
41
no.
3
article id 288.
https://doi.org/10.14214/sf.288
Abstract |
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Carbon sequestration rates in forest soil can be estimated using the concept of calculable stable remains in decomposing litter. In a case study of Swedish forest land we estimated C-sequestration rates for the two dominant tree species in the forest floor on top of the mineral soil. Carbon sequestration rates were upscaled to the forested land of Sweden with 23 x 106 ha with Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (Karst.) L.). Two different theoretical approaches, based on limit-value for litter decomposition and N-balance for vegetation and SOM gave rates of the same magnitude. For the upscaling, using these methods, 17 000 grids of 5 x 5 km were used.
The ‘limit-value approach’ gave a sequestration of 4.8 106 tons of C, annually sequestered in the forest floor, with an average of 180 kg C ha–1 yr–1 and a range from 40 to 410 kg C ha–1 yr–1. The ‘N-balance approach’ gave an average value of c. 96 kg ha–1 yr–1 and a range from –60 to 360 kg ha–1 yr–1. A method based on direct measurements of changes in humus depth over 40 years, combined with C analyses gave an average rate that was not very different from the calculated rates, viz. c. 180 kg ha–1 yr–1 and a range from –20 to 730 kg ha–1 yr–1. These values agree with forest floor C sequestration rate based on e.g. sampling of chronsequences but differ from CO2 balance measurements.
The three approaches showed different patterns over the country and regions with high and low carbon sequestration rates that were not always directly related to climate.
-
Berg,
Dept. of Forest Ecology, University of Helsinki, Finland (present address: Dipartimento Biologia Strutturale e Funzionale, Complesso Universitario, Monte S. Angelo, Napoli, Italy
E-mail:
bjorn.berg@helsinki.fi
- Gundersen, Forest & Landscape Denmark, University of Copenhagen, Denmark E-mail: pg@nn.dk
- Akselsson, Swedish Environmental Research Institute, IVL, Gothenburg, Sweden E-mail: ca@nn.se
- Johansson, Department of Forest Soils, SLU, Uppsala, Sweden E-mail: mbj@nn.se
- Nilsson, Department of Forest Soils, SLU, Uppsala, Sweden E-mail: an@nn.se
- Vesterdal, Forest & Landscape Denmark, University of Copenhagen, Denmark E-mail: lv@nn.dk
Category : Research article
article id 159,
category
Research article
Johan Stendahl,
Maj-Britt Johansson,
Erik Eriksson,
Åke Nilsson,
Ola Langvall.
(2010).
Soil organic carbon in Swedish spruce and pine forests – differences in stock levels and regional patterns.
Silva Fennica
vol.
44
no.
1
article id 159.
https://doi.org/10.14214/sf.159
Keywords:
forest management;
Norway spruce;
Scots pine;
soil carbon;
temperature sum;
tree species;
simulation
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The selection of tree species is one factor to consider if we want to mitigate carbon dioxide emissions to the atmosphere through forest management. The objectives of this study were to estimate the differences in soil organic carbon (SOC) stocks under Norway spruce (Picea abies (L.) Karst.) and Scots pine (Pinus sylvestris L.) forests and to examine causes of differences in the accumulation of carbon in the forest soil. Large-scale inventory data was used to quantify variations in SOC stock in relation to stand type and the accumulation of carbon for spruce and pine stands was analysed by simulation. Based on field data, the national mean SOC stock was 9.2 kg m–2 in spruce dominated stands and 5.7 kg m–2 in pine dominated stands. For both species, the SOC stock, measured in the field inventory, increased significantly with increasing temperature, although at different rates. The SOC stock was larger for spruce under all temperature conditions, but the difference between species diminished with increasing temperature. The simulations indicated that the build-up of SOC over several rotations was 22% higher in spruce stands than in pine stands under similar environmental conditions. The main difference was found to be the greater input of harvest residues for spruce. Further, the simulations showed that ground vegetation contributed considerably more to the litter production under pine than under spruce. On sites where both Scots pine and Norway spruce are considered suitable, the latter should be selected if the aim of the forest management policy is to maximize the accumulation of SOC in the forest. Further, spruce is more favourable for SOC accumulation in areas with cold temperatures and on sites with low productivity.
-
Stendahl,
Department of Soil and Environment, P.O. Box 7001, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden
E-mail:
johan.stendahl@mark.slu.se
- Johansson, Department of Soil and Environment, P.O. Box 7001, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden E-mail: mbj@nn.se
- Eriksson, Department of Energy and Technology, P.O. Box 7061, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden E-mail: ee@nn.se
- Nilsson, Department of Soil and Environment, P.O. Box 7001, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden E-mail: an@nn.se
- Langvall, Unit for Field-based Forest Research, Asa Experimental Forest and Research Station, Swedish University of Agricultural Sciences, SE-36030 Lammhult, Sweden E-mail: ol@nn.se
article id 207,
category
Research article
Mats T. Olsson,
Maria Erlandsson,
Lars Lundin,
Torbjörn Nilsson,
Åke Nilsson,
Johan Stendahl.
(2009).
Organic carbon stocks in Swedish Podzol soils in relation to soil hydrology and other site characteristics.
Silva Fennica
vol.
43
no.
2
article id 207.
https://doi.org/10.14214/sf.207
Keywords:
temperature sum;
soil organic carbon;
forest land;
soil hydrological class;
N deposition;
latitude;
site capacity;
mean annual precipitation;
altitude
Abstract |
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Site characteristics influence soil organic carbon (SOC) stocks. In Podzols under Swedish forest land, SOC stocks were related to latitude, altitude, soil hydrological class categorized by mean groundwater level, mean annual precipitation, temperature sum during the growing season, total annual nitrogen (N) deposition and site capacity. SOC stocks were determined for the O-horizon and for total soil (O-horizon + mineral soil to a depth of 50 cm). Data from the Swedish National Forest Soil Inventory 1993–2001 were used (1477 field plots). The O-horizon was sampled with a core sampler and carbon (C) stocks were determined. For the mineral soil layers the SOC stock was calculated based on the SOC concentrations, bulk density and content of rock fragments. The results showed that the overall mean SOC stock was 2.8 and 8.2 kg C m–2 for O-horizon and total soil, respectively. Soil hydrological class strongly affected SOC stocks, which increased from on average 6.7 kg C m–2 at dry sites to 9.7 kg C m–2 at slightly moist sites. Corresponding values for the O-horizon were 2.0 to 4.4 kg C m–2. The correlation coefficients for the linear relationship between SOC stock and site characteristics were highest for N deposition, which explained up to 25% of variation, and latitude, which explained up to 20% of variation. Altitude had the lowest degree of explanation.
- Olsson, Swedish University of Agricultural Sciences, Dept of Soil and Environment, Uppsala, Sweden E-mail: mto@nn.se
- Erlandsson, Swedish University of Agricultural Sciences, Dept of Soil and Environment, Uppsala, Sweden E-mail: me@nn.se
- Lundin, Swedish University of Agricultural Sciences, Dept of Soil and Environment, Uppsala, Sweden E-mail: ll@nn.se
-
Nilsson,
Swedish University of Agricultural Sciences, Dept of Soil and Environment, Uppsala, Sweden
E-mail:
torbjorn.nilsson@mark.slu.se
- Nilsson, Swedish University of Agricultural Sciences, Dept of Soil and Environment, Uppsala, Sweden E-mail: an@nn.se
- Stendahl, Swedish University of Agricultural Sciences, Dept of Soil and Environment, Uppsala, Sweden E-mail: js@nn.se
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