Variabiliteit in ruimte en tijd ontrafeld. Broeikasgasemissies uit Nederlandse landschappen

Greenhouse gas emissions are highly variable in spaceand time. This variability hampers measurements ofgreenhouse gas emissions and hinders the use of landuse and management as mitigation options. We give anoverview of explaining factors of temporal and spatialvariability of greenhouse gas emissions from Dutchlandscapes.CO2 fluxes have a regular annual temporal variability.Temporal variability of N2O emission is characterizedby low background emissions and high peaks that arerelated to precipitation and manure application, whiletemporal variability of CH4 fluxes is very irregular. Spatialvariability of CO2 can be explained using the croptype in agricultural land or the tree species in forests.Spatial variability of N2O and CH4 is strongly influencedby groundwater and management intensity. Additionally,at the landscape scale there is a significant greenhousegas emission from ditches and open water. Thetemporal variability has to be considered in the designof measurement campaigns, while the insight in factorsexplaining the spatial variability of greenhouse gasemissions can help to improve landscape scale estimatesof greenhouse gas emissions and guide managementdecisions for mitigation.