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Mean residence time of O horizon carbon along a climatic gradient in Scandinavia estimated by 14C measurements of archived soils

Fröberg, Mats and Tipping, Edward and Stendahl, Johan and Clarke, Nicholas and Bryant, Charlotte (2011). Mean residence time of O horizon carbon along a climatic gradient in Scandinavia estimated by 14C measurements of archived soils. Biogeochemistry. 104:1-3, 227-236
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Official URL: http://dx.doi.org/10.1007/s10533-010-9497-3

Abstract

We used two datasets of 14C analyses of archived soil samples to study carbon turnover in O horizons from spruce dominated old-growth stands on well-drained podsols in Scandinavia. The main data set was obtained from archived samples from the National Forest Soil Inventory in Sweden and represents a climatic gradient in temperature. Composite samples from 1966, 1972, 1983 and 2000 from four different regions in a latitude gradient ranging from 57 to 67oN were analysed for 14C content. Along this gradient the C stock in the O horizon ranges from 2.1 kg m-2 in the north to 3.7 kg m-2 in the southwest. The other data set contains 14C analyses from 1986, 1987, 1991, 1996 and 2004 from the O horizons in Birkenes, Norway. Mean residence times (MRT) were calculated using a two compartment model, with a litter decomposition compartment using mass loss data from the literature for the three first years of decomposition and a humus decomposition compartment with a fitted constant turnover rate. We hypothesized that the climatic gradient would result in different C turnover in different parts of the country between northern and southern Sweden. The use of archived soil samples was very valuable for constraining the MRT calculations, which showed that there were differences between the regions. Longest MRT was found in the northernmost region (41 years), with decreasing residence times through the middle (36 years) and central Sweden (28 years), then again increasing in the southwestern region (40 years). The size of the soil organic carbon (SOC) pool in the O horizon was mainly related to differences in litter input and to a lesser degree to MRT. Because N deposition leads both to larger litter input and to longer MRT, we suggest that N deposition contributes significantly to the latitudinal SOC gradient in Scandinavia, with approximately twice as much SOC in the O horizon in the south compared to the north. The data from Birkenes was in good agreement with the Swedish dataset with MRT estimated to 34 years.

Authors/Creators:Fröberg, Mats and Tipping, Edward and Stendahl, Johan and Clarke, Nicholas and Bryant, Charlotte
Title:Mean residence time of O horizon carbon along a climatic gradient in Scandinavia estimated by 14C measurements of archived soils
Series/Journal:Biogeochemistry (0168-2563)
Year of publishing :July 2011
Volume:104
Number:1-3
Page range:227-236
Publisher:Springer
ISSN:0168-2563
Language:English
Additional Information:Published by Springer in Biogeochemistry. The original publication is available at www.springerlink.com
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:P Natural resources > P30 Soil science and management
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:Forest ecology, Soil organisms, Carbonation
Keywords:forest soils, mean residence time, radiocarbon , soil organic carbon
URN:NBN:urn:nbn:se:slu:epsilon-e-124
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-124
Additional ID:
Type of IDID
DOI10.1007/s10533-010-9497-3
ID Code:8178
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: Fröberg Mats
Deposited On:17 Jun 2011 13:06
Metadata Last Modified:02 Dec 2014 10:46

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