Which has the Lowest mean Net Primary Productivity?

Which of the following has the lowest mean net primary productivity?

  1. Temperate forests
  2. Temperate grasslands
  3. Tropical forests
  4. Tropical savanna
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2 Answer(s)

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Option 1 ( Temperate Forests )

Primary production is the synthesis of organic compounds from atmospheric or aqueous carbon dioxide. It principally occurs through the process of photosynthesis, which uses light as its source of energy, but it also occurs through chemosynthesis, which uses the oxidation or reduction of chemical compounds as its source of energy.

RE: Which has the Lowest mean Net Primary Productivity?

Harsh Vardhan Professor Answered on 13th May 2015.
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Primary Production and Plant Biomass for the Earth[edit]

Ecosystem Type Area
(10^6 km^2)
Mean NPP
(g/m^2/yr)
World NPP
(10⁹tons/yr)
Mean Biomass
(kg/m^2)
World Biomass
(10⁹ tons)
Tropical Rain Forest 17.0 2,200 37.4 45 763
Tropical Seasonal Forest 7.5 1,600 12.0 35 260
Temperate Evergreen Forest 5.0 1,300 6.5 35 175
Temperate Deciduous Forest 7.0 1,200 8.4 30 210
Boreal Forest 12.0 800 9.6 20 240
Woodlands & Shrublands 8.5 700 6.0 6 50
Savanna 15.0 900 13.6 4 60
Temperate Grasslands 9.0 600 5.4 1.6 14
Tundra & Alpine 8.0 140 1.1 0.6 5
Desert & Semi-Desert 18.0 90 1.6 0.7 13
Extreme Desert & Ice 24.0 3 0.07 0.02 0.5
Cultivated Land 14.0 650 9.1 1.0 14
Swamp & Wetland 2.0 2,000 4.0 12.3 30
Lake & Stream 2.0 250 0.5 0.02 0.05
— Total Continental 149 773 115 12.3 1837
Open Ocean 332.0 125 41.5 0.003 1.0
Upwelling Zones 0.4 500 0.2 0.02 0.008
Continental Shelf 26.6 360 9.6 0.01 0.27
Algal Bed & Reef 0.6 2,500 1.6 2.0 1.2
Estuaries 1.4 1,500 2.1 1.0 1.4
— Total Marine 361 152 55.0 0.01 3.9
—- Grand Total 510 333 170 3.6 1841
piyushyadav12 Default Answered on 4th June 2015.
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