Table 2 Carbon footprint per unit area and carbon footprint per unit yield from different studies of grain crop production in China.
Sample size | Yield | Carbon footprint per unit area | Carbon footprint per unit yield | Calculation method | Data source | Reference | |
|---|---|---|---|---|---|---|---|
kg | kg ce/ha | kg ce/kg | |||||
Maize | — | 6791 | 781 | 0.12 | A | National statistics | Cheng et al.18 |
58 | 7000 ± 200 | 2300 ± 100 | 0.33 ± 0.02 | A | Household survey | Yan et al.19 | |
1249 | 8480 | 4052 | 0.48 | B | Household survey | This study | |
Wheat | — | 5550 | 794 | 0.14 | A | National statistics | Cheng et al.18 |
48 | 4800 ± 200 | 3000 ± 200 | 0.66 ± 0.03 | A | Household survey | Yan et al.19 | |
1089 | 7548 | 5455 | 0.75 | B | Household survey | This study | |
Rice | — | 6716 | 2472 | 0.37 | A | National statistics | Cheng et al.18 |
17 | 7600 ± 100 | 6000 ± 100 | 0.80 ± 0.02 | A | Household survey | Yan et al.19 | |
902 | 14123 | 11881 | 1.60 | B | Household survey | This study |
