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Montane Meadows: A Soil Carbon Sink or Source?
- Source :
-
Ecosystems . Aug2021, Vol. 24 Issue 5, p1125-1141. 17p. - Publication Year :
- 2021
-
Abstract
- As the largest biogeochemically active terrestrial reserve of carbon (C), soils have the potential to either mitigate or amplify rates of climate change. Ecosystems with large C stocks and high rates of soil C sequestration, in particular, may have outsized impacts on regional and global C cycles. Montane meadows have large soil C stocks relative to surrounding ecosystems. However, anthropogenic disturbances in many meadows may have altered the balance of C inputs and outputs, potentially converting these soils from net C sinks to net sources of C to the atmosphere. Here, we quantified ecosystem-level C inputs and outputs to estimate the annual net soil C flux from 13 montane meadows spanning a range of conditions throughout the California Sierra Nevada. Our results suggest that meadow soils can be either large net C sinks (577.6 ± 250.5 g C m−2 y−1) or sources of C to the atmosphere (− 391.6 ± 154.2 g C m−2 y−1). Variation in the direction and magnitude of net soil C flux appears to be driven by belowground C inputs. Vegetation species and functional group composition were not associated with the direction of net C flux, but climate and watershed characteristics were. Our results demonstrate that, per unit area, montane meadows hold a greater potential for C sequestration than the surrounding forest. However, legacies of disturbance have converted some meadows to strong net C sources. Accurate quantification of ecosystem-level C fluxes is critical for the development of regional C budgets and achieving global emissions goals. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CARBON cycle
*MEADOWS
*CARBON in soils
*FUNCTIONAL groups
*CLIMATE change
Subjects
Details
- Language :
- English
- ISSN :
- 14329840
- Volume :
- 24
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Ecosystems
- Publication Type :
- Academic Journal
- Accession number :
- 151838884
- Full Text :
- https://doi.org/10.1007/s10021-020-00572-x