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Table 3 Natural and purchased emergy input in major wheat planting areas of China

From: The creation of “Ecosystem Core” hypothesis to explain ecosystem evolution

Ecological zones

Natural emergy input (× 1014 sej/ha/year)

Purchased emergy input (× 1014 sej/ha/year)

Natural emergy input ratio (%)

Purchased emergy input ratio (%)

Huang-Huai-Hai Plain

5.91

36.95

14

86

Northwest of China

7.20

41.98

15

85

Loess Plateau

8.80

39.55

18

82

Southwest of China

9.13

25.24

27

73

Northeast of China

9.55

13.80

41

59