A review of nitrogen enrichment effects on three biogenic GHGs: the CO2 sink may be largely offset by stimulated N2O and CH4 emission.

By Lingli Liu, T. Greaver. Ecology Letters, 2009

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Global change pressures on soils from land use and management (2016, background): “However, increased carbon sequestration (Reay et al., 2008) may be offset by increased emissions of the greenhouse gases N2O and CH4 (Liu & Greaver, 2009).”
Towards a trait‐based ecology of wetland vegetation (2017, background): “If incomplete, as e.g. under high levels of nitrate loading, low pH or incomplete anoxia, denitrification also results in the production of the potent GHG nitrous oxide (N2O) (Verhoeven et al. 2006; Liu & Greaver 2009).”
Global evidence on nitrogen saturation of terrestrial ecosystem net primary productivity (2016, methodology): “Furthermore, the data from different ecosystems, N-fertilizer forms and N addition levels in the same study were regarded as independent observations (Liu & Greaver 2009).”
A global analysis of soil acidification caused by nitrogen addition (2015, methodology): “Here, we considered data from different N addition rates and N-fertilizer forms in the same experiment as independent observations (Curtis and Wang 1998, Liu and Greaver 2009).”
Effects of straw carbon input on carbon dynamics in agricultural soils: a meta‐analysis (2014, methodology): “For example, N fertilizer application generally enhances soil C sequestration, but it also increases N2O emission (Liu & Greaver, 2009; Lu et al., 2011b).”