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Sequestration of carbon in the humus layer of Swedish forests - direct measurements
Department of Forest Ecology, University of Helsinki, Helsinki, Finlan; Dipartimento Biologia Strutturale e Funzionale, Complesso Universitario, Napoli, Italy.
Högskolan i Gävle.
Department of Forest Soils, Swedish University of Agriculture, Uppsala, Sweden.
Forest and Landscape Denmark, University of Copenhagen, HØrsholm, Denmark.
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2009 (Engelska)Ingår i: Canadian Journal of Forest Research, ISSN 0045-5067, E-ISSN 1208-6037, Vol. 39, nr 5, s. 962-975Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

To determine sequestration rates of carbon dioxide (CO2) we calculated the carbon (C) storage rate in humus layers of Swedish forests with Podsolic soils, which account for 14.2 x 106 ha of the 22.7 x 106 ha of forested land in Sweden. Our data set covered 41 years of humus inventories and mean humus layer thickness in 82513 plots. We analysed three forest types: (i) all combinations of tree species, (ii) forests dominated (>70%) by Norway spruce (Picea abies (L.) Karst.), and (Ui) forests dominated (>70%) by Scots pine (Pinus sylvestris L.). To relate changes in humus layer thickness to land area we used the intersections in 25 km x 25 km grids and used kriging interpolation, permitting calculations for each forest type. For each intersection mean humus thickness for each year was calculated and regressed against time to obtain the rate of change. This rate, humus bulk density, and humus C concentration were used, to calculate sequestration rates. The mean sequestration rate was 251 kg C-ha-1'year1, which is higher than theoretical values. The sequestration rate was positively related to temperature sum, albeit including effects of forest management. The pine-dominated forest type had a mean rate of 283 kgCha⁁year-1, and. the spruce-dominated had a mean rate of 239 kg Cha-1-year1. Under similar site conditions, pine sequestered more C than spruce (difference of 71 kg Cha-1'year-1; p < 0.0001), showing the importance of this type of ecosystem for C sequestration.

Ort, förlag, år, upplaga, sidor
2009. Vol. 39, nr 5, s. 962-975
Nyckelord [en]
Bulk density; C sequestration; Data sets; Direct measurement; Forest management; Forest type; Kriging interpolation; Land areas; Layer thickness; Norway spruce; Picea Abies (L.) Karst; Pinus sylvestris; Rate of change; Scots pine; Site conditions; Theoretical values; Tree species
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URN: urn:nbn:se:hig:diva-5774DOI: 10.1139/X09-022ISI: 000267810800008Scopus ID: 2-s2.0-66249134239OAI: oai:DiVA.org:hig-5774DiVA, id: diva2:274616
Tillgänglig från: 2009-10-30 Skapad: 2009-10-30 Senast uppdaterad: 2018-03-13Bibliografiskt granskad

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Johansson, Maj-Britt

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