Automated measurements of greenhouse gases fluxes from tree stems and soils: magnitudes, patterns and drivers.

ABSTRACT: Tree stems exchange CO₂, CH₄ and N₂O with the atmosphere but the magnitudes, patterns and drivers of these greenhouse gas (GHG) fluxes remain poorly understood. Our understanding mainly comes from static-manual measurements, which provide limited information on the temporal variability and magnitude of these fluxes. We measured hourly CO₂, CH₄ and N₂O fluxes at two stem heights and adjacent soils within an upland temperate forest. We analyzed diurnal and seasonal variability of fluxes and biophysical drivers (i.e., temperature, soil moisture, sap flux). Tree stems were a net source of CO₂ (3.80 ± 0.18 µmol m^-2 s^-1; mean ± 95% CI) and CH₄ (0.37 ± 0.18 nmol m^-2 s^-1

SUBMITTER: Barba J 

PROVIDER: S-EPMC6408546 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature