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. 2014 Dec 10;4:7406. doi: 10.1038/srep07406

Table 3. Areas of cropland, forest, grassland and desert/semi-desert in China and soil NO emissions from the four land cover types.

  Area Percentage of total land area Soil NO emissions Percentage of anthropogenic NOx emission
  106 ha % Gg N yr−1 %
Cropland 163.42a 17.02 442.83 (296.67–699.15) 6.51 (4.36–10.28)
Forest 258.26b 22.64 371.96 (153.37–747.95) 5.47 (2.26–11.00)
Grassland 191.65b 26.15 328.98 (130.33–527.63) 4.84 (1.92–7.76)
Deserts and semi-deserts 262.20c 27.31 82.59 (7.87–157.32) 1.21 (0.12–2.31)
Total 875.53 93.12 1226.33 (588.24–2132.05) 18.03 (8.65–31.35)

Note: a, from China Statistical Yearbook 2013 (133.28 × 106 ha for upland fields and 30.14 × 106 ha for rice fields in 2012); b, from Wu et al.60; c, from Zhao et al.,61.