Whole-crown 13C-pulse labelling in a sub-arctic woodland to target canopy-specific carbon fluxes



Friggens NL, Hartley IP, Grant HK, Parker TC, Subke J & Wookey PA (2022) Whole-crown 13C-pulse labelling in a sub-arctic woodland to target canopy-specific carbon fluxes. Trees, 36 (4), pp. 1497-1445.

Climate change-driven increases in plant productivity have been observed at high northern latitudes. These trends are driven, in part, by the increasing abundance of tall shrub and tree species in arctic ecosystems, and the advance of treelines. Higher plant productivity may alter carbon (C) allocation and, hence, ecosystem C cycling and soil C sequestration. It is important to understand the contributions that the newly established canopy forming overstorey species makes to C cycling in these ecosystems. However, the presence of a dense understorey cover makes this challenging, with established partitioning approaches causing disturbance and potentially introducing measurement artefacts. Here, we develop an in situ whole-crown 13C-pulse labelling technique to isolate canopy C fluxes in areas of dense understorey cover. The crowns of five mountain birch (Betula pubescens ssp. czerepanovii) trees were provided with a 13CO2 pulse using portable field equipment, and leaf samples were collected from neighbouring con-specific trees and hetero-specific understorey shrubs on days 1–10 and 377 post-crown labelling. We found effective and long-term enrichment of foliage in labelled trees, but no evidence of the 13C-signal in con- or hetero-specific neighbouring trees or woody shrubs. This method is promising and provides a valuable tool to isolate the role of canopy tree species in ecosystems with dense understorey cover.

13C labelling; Betula pubescens; Carbon flux; Treeline forest

Trees: Volume 36, Issue 4

FundersNERC Natural Environment Research Council and NERC Natural Environment Research Council
Publication date31/08/2022
Publication date online28/02/2022
Date accepted by journal13/01/2022

People (3)


Dr Tom Parker
Dr Tom Parker

Research Fellow, Biological and Environmental Sciences

Professor Jens-Arne Subke
Professor Jens-Arne Subke

Professor, Biological and Environmental Sciences

Professor Philip Wookey
Professor Philip Wookey

Professor, Biological and Environmental Sciences

Projects (2)