Use or appropriation of photosynthate (pt 2)
... estimates based on land use as well as consumption

NPP co-opted

Cultivated land

15.0 Pg

Grazing land
  • Converted pastures
  • Consumed on natural lands
  • Burned on natural lands
    .......... Subtotal


9.8 Pg
0.8 Pg
1.0 Pg
11.6 Pg

Forest land
  • Killed at harvest, not used
  • Shifting cultivation
  • Land clearing
  • Forest plantation activities
  • Forest harvests
    .......... Subtotal


1.3 Pg
6.1 Pg
2.4 Pg
1.6 Pg
2.2 Pg
13.6 Pg

Human occupied areas

0.4 Pg

Subtotal terrestrial

40.6 Pg

Aquatic ecosystems

2.0 Pg

Total

42.6 Pg

from Vitousek et al. 1986. Human appropriation of the products of photosynthesis. BioScience 36: 368-373

Note: This is 31% of all terrestrial NPP and 2.2% of all aquatic NPP co-opted by humans for our direct or indirect use.