Tree biomass does not correlate with soil carbon stocks in forest-tundra ecotones along a 1100 km latitudinal gradient in Norway

• Main Authors: Devos, Claire Céline, Ohlson, Mikael, Næsset, Erik, Klanderud, Kari, Bollandsås, Ole Martin
• Format: Dataset
• Language: unknown
• Published: 2023
• Subjects: boreal forest; Tundra; treeline; Soil carbon; Norway; Forest-tundra ecotone
• Online Access: https://zenodo.org/record/8132492; https://doi.org/10.5061/dryad.wm37pvmt3

Due to climate warming, forests are expanding to higher elevations and latitudes at the expense of tundra vegetation. While the subsequent increase in aboveground biomass is well-documented, there is much speculation regarding the effects on soil organic carbon (SOC) stocks. To provide insight into the consequences of tree encroachment into treeless tundra, we sampled SOC stocks across 36 forest-tundra ecotones along a 1100 km latitudinal gradient in Norway. Our results show that SOC stocks vary greatly within, as well as among treeline ecotones, and that SOC stocks do not correlate with tree biomass and tree species. SOC stocks do increase with temperature, and vary with slope steepness, slope aspect, and soil parent material. Applying a 'space-for-time substitution' perspective, our findings suggest that tree encroachment into tundra is unlikely to have immediate consequences for SOC stocks. Funding provided by: Norges ForskningsrådCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100005416Award Number: 281066Funding provided by: Norges Miljø- og Biovitenskapelige UniversitetCrossref Funder Registry ID: http://dx.doi.org/10.13039/501100008119Award Number: