Work Package 3
The relationships between fixed N and forest floor CO2, CH4, and N2O fluxes following fire-disturbance and across N gradients
WP3 explores the links between soil and understorey greenhouse gas fluxes (CO2, CH4, and N2O) and N fertility conditions.
WP3 explores the links between soil and understorey greenhouse gas fluxes (CO2, CH4, and N2O) and N fertility conditions.
N cycling and greenhouse gases
Fig 1. measuring florest floor CO2 net ecosystem exchange (NEE)
Soil and understorey CO2, CH4, and N2O greenhouse gas (GHG) fluxes are directly influenced by stand age and associated N fertility conditions in boreal forests (Ball et al. 2007). As yet, there is no direct evidence of the influence of N fixation on green house gas emissions in boreal forests, but soil NO3- accumulation and increased net nitrification after fire has been observed for up to 30 years (DeLuca et al. 2002, DeLuca et al. 2006).
This WP will assess the direct link between N fixation and photosynthesis rates in feathermosses, and determine the relationship between N fixation (data from WP1, 2) soil N accumulation and nitrification rates (data from WP1, 2) on understorey ecosystem, plant and soil GHG emissions from fire chronosequences and N gradients in boreal forest systems.
This WP will assess the direct link between N fixation and photosynthesis rates in feathermosses, and determine the relationship between N fixation (data from WP1, 2) soil N accumulation and nitrification rates (data from WP1, 2) on understorey ecosystem, plant and soil GHG emissions from fire chronosequences and N gradients in boreal forest systems.
