. 2021 Nov 20;28(3):899–917. doi: 10.1111/gcb.15960

TABLE 6.

Anthropogenic N₂O emissions, N‐induced C sequestration in forest aboveground woody biomass (considering anthropogenic N deposition only) and net climate impact of both fluxes (expressed as 100‐year Global Warming Potential in Tg C‐equivalents per year)

	Anthropogenic N₂O emissions (Tg C‐eq. yr⁻¹) ^a	Increased C sequestration due to anthropogenic N deposition (Tg C yr⁻¹) ^b	Reduced C sequestration due to anthropogenic N deposition (Tg C yr⁻¹) ^c	Net climate impact of anthropogenic N₂O and net N‐induced C sink (Tg C‐eq. yr⁻¹)
	A	B	C	A + B + C
Boreal	45	−10 (−22%)	0 (+0%)	35
Temperate	404	−23 (−6%)	2 (+0%)	383
Tropical	432	−20 (−5%)	16 (+4%)	427
World	882	−53 (−6%)	17 (+2%)	846

Positive numbers represent a flux leading to an increase in atmospheric greenhouse gas concentrations, negative numbers represent a removal from the atmosphere. Percentages in columns (B) and (C) show ratio of N‐induced forest C sequestration to anthropogenic N₂O emissions in column (A) (analogue to percentages shown in Figure 3).

^{^a}

Obtained from an overlay of biomes with spatially explicit anthropogenic N₂O emissions for the years 2007–2016 estimated based on data presented in Tian et al. (2020), see Section 2.2.2.

^{^b}

Obtained by multiplying predicted C‐N responses with anthropogenic N deposition to forests only for grid cells where mean predicted C‐N response >0 (i.e. where N was estimated to increase C sequestration).

^{^c}

Obtained by multiplying predicted C‐N responses with anthropogenic N deposition to forests only for grid cells where mean predicted C‐N response <0 (i.e. where N was estimated to reduce C sequestration).