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Nonlinear responses of ecosystem carbon fluxes to nitrogen deposition in an old‐growth boreal forest.
- Source :
-
Ecology Letters . Jan2022, Vol. 25 Issue 1, p77-88. 12p. - Publication Year :
- 2022
-
Abstract
- Nitrogen (N) deposition is known to increase carbon (C) sequestration in N‐limited boreal forests. However, the long‐term effects of N deposition on ecosystem carbon fluxes have been rarely investigated in old‐growth boreal forests. Here we show that decade‐long experimental N additions significantly stimulated net primary production (NPP) but the effect decreased with increasing N loads. The effect on soil heterotrophic respiration (Rh) shifted from a stimulation at low‐level N additions to an inhibition at higher levels of N additions. Consequently, low‐level N additions resulted in a neutral effect on net ecosystem productivity (NEP), due to a comparable stimulating effect on NPP and Rh, while NEP was increased by high‐level N additions. Moreover, we found nonlinear temporal responses of NPP, Rh and NEP to low‐level N additions. Our findings imply that actual N deposition in boreal forests likely exerts a minor contribution to their soil C storage. [ABSTRACT FROM AUTHOR]
- Subjects :
- *TAIGAS
*SOIL respiration
*HETEROTROPHIC respiration
*ECOSYSTEMS
*NITROGEN
*CARBON
Subjects
Details
- Language :
- English
- ISSN :
- 1461023X
- Volume :
- 25
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Ecology Letters
- Publication Type :
- Academic Journal
- Accession number :
- 154045673
- Full Text :
- https://doi.org/10.1111/ele.13906