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.