Extended Data Table 3 Summary of current terrestrial BNF rates (kg N ha−1 yr−1) by niche by biome and global totals

From: Global terrestrial nitrogen fixation and its modification by agriculture

  1. Central estimates are 2.5% trimmed means for natural biomes (Fig. 2a) and arithmetic means for agricultural sources (Fig. 2b) weighted by land area. Lower and upper bounds in parentheses are 68% confidence intervals (analogous to ± 1 standard error) (Extended Data Figs. 1 and 2). The “n =” value in each cell indicates the number of BNF activity values upon which the rates in the cell are based. “*” indicates that data was absent or limited, and we substituted data from other biomes to account for niche spatial coverage; see details in Methods and Supplementary Methods. “ND” stands for “Not determined”. The biome abbreviations are as in Extended Data Table 1. †IGBP land cover area in 2019 from ref. 51 - the land area of biomes weighted mean BNF rates across natural biomes. ‡Cultivated land area of N-fixing crops in 2019 from ref. 37. §Data from ref. 53.
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