Table 1 Emergy input of main ecosystems in Guyuan County of Hebei Province, China
From: The creation of “Ecosystem Core” hypothesis to explain ecosystem evolution
Ecosystem types | Ecosystems | Natural emergy input (× 1014 sej/ha/year) | Purchased emergy input (× 1014 sej/ha/year) | Sum of emergy input (× 1014 sej/ha/year) |
|---|---|---|---|---|
Commercial crop | Potatoes | 5.31 | 147.67 | 152.98 |
Chinese cabbage greenhouse | 5.31 | 146.36 | 151.67 | |
Spinach greenhouse | 5.31 | 146.35 | 151.66 | |
Cabbage | 5.31 | 101.04 | 106.35 | |
Artificial forage | Oats | 5.31 | 15.63 | 20.94 |
Corn silage | 5.31 | 12.09 | 17.40 | |
Field crop | Naked oats | 5.31 | 6.94 | 12.25 |
Flax | 5.31 | 6.90 | 12.21 | |
Wheat | 5.31 | 6.89 | 12.20 | |
Grassland | Free grazing | 5.31 | 4.21 | 9.52 |
Chinese leymus grassland | 5.31 | 3.54 | 8.85 | |
Natural mowed grassland | 5.31 | 3.53 | 8.84 |