In a salt marsh in Georgia, the quantity of solar radiation reaching the ground during the summer is 7,000,000 cal/m2/day. The gross productivity of the producers in the salt marsh (mostly microscopic algae) is 0.0040 g/cm2/day. The average rate of respiration (the respiration requirement) is 35% of the gross primary productivity. Ecologists have found that 1 g of salt marsh producers (the algae) is equivalent to 2,920 calories. Calculate the net primary productivity of the system, in g/m2/day.

NPP = 26 g/m²/day

Explanation:

Important data:

•1 m² = 10,000 cm²

•NPP = GPP - Respiration

•NPP= Net primary productivity of a system

•GPP= Gross productivity of the producers

Available Data:

•GPP = 0.0040 g/cm²/day

•Respiration rate = 35% of the gross primary productivity

We need to calculate the NPP, which equals GPP - Respiration rate.

The respiration rate is 35% of the GPP. This is:

100% GPP 0.004 g/cm²/day

35% GPP X = (35 x 0.004)/100 = 0.0014 g/cm²/day

Now that we know the values of GPP and respiration rate, we can calculate the NPP.

NPP = GPP - Respiration

NPP = 0.004 g/cm²/day - 0.0014 g/cm²/day

NPP = 0.0026 g/cm²/day

Now we also know the NPP, but this value is calculated in g/cm²/day, and we need to calculate it in g/m²/day, so if 1 m² = 10,000 cm², then:

1 cm² 0.0026 g/cm²/day

10,000cm²X = (10,000 x 0.0026)/1 = 26 g/m²/day

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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