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Tree stem bases are sources of CH 4 and N 2 O in a tropical forest on upland soil during the dry to wet season transition
- Source :
- Global Change Biology. 25:361-372
- Publication Year :
- 2018
- Publisher :
- Wiley, 2018.
-
Abstract
- Tropical forests on upland soils are assumed to be a methane (CH4) sink and a weak source of nitrous oxide (N2O), but studies of wetland forests have demonstrated that tree stems can be a substantial source of CH4,and recent evidence from temperate woodlands suggests that tree stems can also emit N2O. Here, we measured CH4 and N2O fluxes from the soil and from tree stems in a semi-evergreen tropical forest on upland soil. To examine the influence of seasonality, soil abiotic conditions, and substrate availability (litter inputs) on trace greenhouse gas (GHG) fluxes, we conducted our study during the transition from the dry to the wet season in a long-term litter manipulation experiment in Panama, Central America. Trace GHG fluxes were measured from individual stem bases of two common tree species and from soils beneath the same trees. Soil CH4 fluxes varied from uptake in the dry season to minor emissions in the wet season. Soil N2O fluxes were negligible during the dry season but increased markedly after the start of the wet season. By contrast, tree stembases emitted CH4 and N2O throughout the study. Although we observed no clear effect of litter manipulation on trace GHG fluxes, tree species and litter treatments interacted to influence CH4 fluxes from stems and N2O fluxes from stems and soil, indicating complex relationships between tree species traits and decomposition processes that can influence trace GHG dynamics. Collectively, our results show that tropical trees can act as conduits for trace GHGs that most likely originate from deeper soil horizons, even when they are growing on upland soils. Coupled with the finding that the soils may be a weaker sink for CH4 than previously thought, our research highlights the need to reappraise trace gas budgets in tropical forests.
- Subjects :
- 0106 biological sciences
Wet season
Abiotic component
Global and Planetary Change
geography
geography.geographical_feature_category
010504 meteorology & atmospheric sciences
Ecology
Wetland
15. Life on land
Plant litter
Seasonality
medicine.disease
010603 evolutionary biology
01 natural sciences
Agronomy
13. Climate action
Soil water
Dry season
medicine
Environmental Chemistry
Environmental science
Soil horizon
0105 earth and related environmental sciences
General Environmental Science
Subjects
Details
- ISSN :
- 13652486 and 13541013
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Global Change Biology
- Accession number :
- edsair.doi.dedup.....461526569e16f720252f34dbc44ce879