Geoscience Reference
In-Depth Information
Table 2.2 Summary of the energy balances of the agrarian system in a Catalan area near Barcelona (Spain) towards 1860 and in 1999
-
2004, compared with
the contemporary agricultural landscapes
Towards 1860
In
1999
-
2004
Primary solar energy xed in the useful agrarian cover (UAC, 1,000GJ, GJ/ha/yr)
Cropland
146.3
187.3
Pastureland
34.4
-
Woodland
87.2
211.0
Final output by sector (FO, 1,000GJ, GJ/ha/yr)
Crops
38.6
135.9
Livestock
2.9
144.5
Forestry
129.5
69.1
Livestock weight units (LU of 500 kg, Kg/ha)
983 (41)
23.833 (1,021)
Cattle feed (1,000GJ, GJ/ha/yr)
68.7 (5.7)
1,095.7 (103)
Manure or fertilizers applied (1,000GJ, GJ/ha/yr)
23.9 (2)
55.5 (4.7)
Total inputs consumed (TIC, 1,000GJ, GJ/ha/yr)
102.4 (8.5)
1,625.8 (139.1)
External inputs consumed (EIC, 1,000GJ, GJ/ha/yr)
6.6 (0.2)
1,574.4 (134.9)
Total nal output (TFO, 1,000GJ, GJ/ha/yr)
171.0 (14.3)
349.5 (29.9)
Energy return on total inputs (EROTI = TFO/TIC, 1,000GJ, GJ/ha/yr)
1.67
0.21
Energy return on external inputs (EROEI = TFO/EIC, 1,000GJ, GJ/ha/yr)
66.6
0.22
TFO/primary solar energy xed in the AUC (%)
64
88
EIC/primary solar energy
xed in the AUC (%)
1
395
(continued)
