Primary Productivity

 

If ocean

 Type of Land
   Net Primary Productivity in metric tons per trillion square meters How many trillion square meters % of Earth's Land Surface Area
 Barren   tundra, deserts, sand, ice  0.018  50  33
 Temperate Forests  deciduous and evergreen  0.6  32.5  22
 Tropical Rain Forests    1.0  17  11
 Cultivated Land    .33 14   9
 Marshland  swamps, lakes, streams  1.24  4.5  3
 Grassland  prairie and savanna  .25  32  21

 Totals

   3.44  150  99

If ocean yields 8 times land then ocean yieilds 3.44 * 8 = 27.52 / 70% = 3.93

http://www.sph,edu/ies/land.htm Land Use and Net Primary Productivity

5/20 *100= 25%

 Ecosystem Type

 Net Primary Productivity
(Kilocalories / square meter / year)
 KiloCalories / square meter / day  Guess if
1,000 =3
 Tropical Rain Forest

 9000
 25  27
 Estuary (the place where a river meets the sea)

 9000
 25  27
 Swamps and Marshes

 9000
 25 27
 Savanna (grass, scattered trees, no winter snow)

 3000
 8  9
 Deciduous Temperate Forest

 6000
 16 18
 Boreal Forest (Evergreen Coniferous Forest)

 3500
 9.54  10
 Temperate Grassland

 2000
 5.48  6
 Polar Tundra

 600
 1.64  2
 Desert

 <200
 .5  .6


This table is from http://www.geog.ouc.bc.ca/physgeog/contents/9l.html an online Geology course created by Dr, Michael Pidwirny at Okanagan College, British Columbia, Canada.