G.2.2 Calculate values for gross production and net production using the equation: gross production – respiration = net production
Gross production: The total energy or nutrients assimilated by organism, population, or community.
Net Production: The assimilation rate - the amount of matter lost through respiration
Gross production is harder to measure than net because respiration is a continuous process that takes in the products of primary production before measured.
Both gross and net primary production are in units of mass / area / time.
Net Primary Production= Gross primary production- respiration (by plants)
Ex) Given that:
Gross production = 809 kJ m^-2 yr^-1
Respiration = 729 kJ m^-2 yr^-1
Then:
809-729= 80
Net production= 80 kJ m^-2 yr^-1
Human appropriation of net production
Distribution of net production
Information :http://en.wikipedia.org/wiki/Primary_production
Picture: http://www.civilizationsfuture.com/ecosystem.html
Comments (1)
Jay said
at 1:15 pm on Aug 24, 2010
Terry; you defined the terms but have not explained, with examples, what gross production is. Graphics have potential but it is not clear what they represent; titles are inadequate.