Primary Productivity

 

 Type of Land
 

 A

Net Primary Productivity in metric tons per trillion square meters

B

 

How many trillion square meters

A*B     % of Earth's Land Surface Area
 Barren   tundra, deserts, sand, ice  0.018  50 .90      33
 Temperate Forests  deciduous and evergreen  0.6  32.5 19.50      22
 Tropical Rain Forests    1.0  17 17      11
 Cultivated Land    .33 14  4,62      9
 Marshland  swamps, lakes, streams  1.24  4.5 5,58      3
 Grassland  prairie and savanna  .25  32 8      21

 Totals

   3.44  150 516      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.