Tropical peatlands release significant quantities of greenhouse gases to the atmosphere, yet the relative contributions of heterotrophic and autotrophic respiration to net CO2 fluxes remains sparsely quantified. We used a combination of in situ trenching and vegetation removal in ex situ pots to quantify root-derived CO2 under two plant functional types within a mixed species forest. Trenching significantly reduced surface CO2 flux, indicating that approximately two-thirds of the released CO2 was derived from roots. In contrast, ex situ vegetation removal in pots indicated that root-derived CO2 accounted for 27% of the total CO2 flux for Campnosperma panamensis, a broadleaved evergreen tree, and 49% for Raphia taedigera, a canopy palm. The results show that root-derived CO2 is a major contribution to net CO2 emissions in tropical peatlands, and that the magnitude of the emissions is affected by plant species composition. This is important in the context of land use change driving alterations in vegetation cover. © 2018, The Author(s).
- Authors: Girkin, N.T., Turner, B.L., Ostle, N., Sjögersten, S.
- Author Affiliation: University of Nottingham, Smithsonian Tropical Research Institute, Lancaster University
- Subjects: peatlands, tropics, greenhouse gases, carbon cycle, soil respiration, emissions, land use change
- Publication type: Journal Article
- Source: Wetlands Ecology and Management 26(5): 985-991
- Year: 2018
- DOI: https://doi.org/10.1007/s11273-018-9617-8