caa a22 4500 605517258 CHVBK 20210128100718.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s10533-014-0060-5 doi (NATIONALLICENCE)springer-10.1007/s10533-014-0060-5 A carbon balance of Norway: terrestrial and aquatic carbon fluxes [Elektronische Daten] [Heleen de Wit, Kari Austnes, Gro Hylen, Lise Dalsgaard] Northern landscapes accumulate carbon in vegetation and soils while rivers transport significant amounts of land-derived carbon to coastal areas. Here, we quantify carbon sources and sinks in main ecosystems (forests, peatlands, mountains, agricultural areas, lakes) in Norway for 1990-2008, and compare riverine carbon transport with terrestrial carbon accumulation in Norway's four major discharge areas. Mean annual carbon accumulation (6.0±0.9 Tg C; 19g C m−2) in terrestrial ecosystems balanced 40% of national greenhouse gas emissions. The area-normalized terrestrial sink strength declined in the following order (in g C m−2 year−1): tree biomass (40±3)>peatlands (19±15)>forest soils (9±1)≫lakes (2±1)>mountains (0.5±0.3), while agricultural soils were sources of carbon (−36±74). The most precise estimate in the carbon balance was for tree biomass, because of the underlying forest inventory data. Poor data on land management and soil type in agricultural soils, and on (former) drainage and peatland type resulted in high uncertainty in carbon loss and uptake estimates in agricultural soils and peatlands, which impacted the uncertainty in total terrestrial carbon accumulation. Also, carbon losses from disturbance in organic soil types were poorly constrained. Riverine coastal inputs of land-derived organic carbon (OC) were 1.0±0.1 Tg C year−1 (3.0g C m−2 year−1), with highest area-specific riverine export in western (4.5g C m−2 year−1) and lowest (1.7g C m−2 year−1) in subarctic Norway. In west and middle Norway, river OC export was approximately equal to carbon accumulation in soils and wetlands, while it was 50% of soil and wetland carbon accumulation in southeast and subarctic Norway. Lateral aquatic transport of carbon is not explicitly accounted for in forest soil carbon accumulation estimates, although aquatic fluxes represent a climate-dependent carbon loss from soil carbon pools. The lack of methods that adequately account for lateral fluxes in carbon balances adds considerable uncertainty to soil carbon sink estimates. Climate warming and associated changes in precipitation may result in substantial alterations of terrestrial and aquatic carbon fluxes, with uncertain implications for the terrestrial carbon sink of northern landscapes. Springer International Publishing Switzerland, 2015 Forest carbon sink nationallicence Riverine carbon transport nationallicence Boreal and subarctic ecosystems nationallicence Peatland management nationallicence Climate nationallicence Uncertainty nationallicence de Wit Heleen Norwegian Institute for Water Research, Gaustadalléen 21, 0349, Oslo, Norway aut Austnes Kari Norwegian Institute for Water Research, Gaustadalléen 21, 0349, Oslo, Norway aut Hylen Gro Norwegian Forest and Landscape Institute, Mailbox 115, 1431, Ås, Norway aut Dalsgaard Lise Norwegian Forest and Landscape Institute, Mailbox 115, 1431, Ås, Norway aut Biogeochemistry Springer International Publishing 123/1-2(2015-03-01), 147-173 0168-2563 123:1-2<147 2015 123 10533 https://doi.org/10.1007/s10533-014-0060-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-014-0060-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- de Wit Heleen Norwegian Institute for Water Research, Gaustadalléen 21, 0349, Oslo, Norway aut NATIONALLICENCE 700 1- Austnes Kari Norwegian Institute for Water Research, Gaustadalléen 21, 0349, Oslo, Norway aut NATIONALLICENCE 700 1- Hylen Gro Norwegian Forest and Landscape Institute, Mailbox 115, 1431, Ås, Norway aut NATIONALLICENCE 700 1- Dalsgaard Lise Norwegian Forest and Landscape Institute, Mailbox 115, 1431, Ås, Norway aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 123/1-2(2015-03-01), 147-173 0168-2563 123:1-2<147 2015 123 10533