Energy Produced by Different Organisms
16000
14000
Energy (kJ/m2/year)
12000
10000
8000
6000
4000
2000
0
Producers (Plants
Consumers (Animals and Their Products)
2:
Average kJ/m2/year for producers:
Avg = 840 + 3400 + 3400 + 3800 + 3850 + 4200 + 5200 + 6300 + 6700 + 6700 + 8300 + 14650
12
Avg = 5611.66.... kJ/m2/year for producers
Average kJ/m2/year for onsumers:
Avg = 8 + 550 + 800 + 800 + 840 + 1800
6
Avg = 799.66... kJ/m2/year for producers
3:
Fish = 800 kJ / 8 kJ/m2/year = 100 m2/year
Beef (feedlot) = 800 kJ / 550 kJ/m2/year = 1.4545... m2/year
Pork = 800 kJ / 800 kJ/m2/year = 1 m2/year
Chicken = 800 kJ / 800 kJ/m2/year = 1 m2/year
Eggs = 800 kJ / 840 kJ/m2/year = 0.9524 m2/year
Other vegetables = 800 kJ / 840 kJ/m2/year = 0.9524 m2/year
Milk = 800 kJ / 1800 kJ/m2/year = 0.4444... m2/year
Carrots = 800 kJ / 3400 kJ/m2/year = 0.2353 m2/year
Wheat Cereal = 800 kJ / 3400 kJ/m2/year = 0.2353 m2/year
Peaches and Pears = 800 kJ / 3800 kJ/m2/year = 0.2105 m2/year
Peanut Butter = 800 kJ / 3850 kJ/m2/year = 0.2078 m2/year
Oranges and Grapefruit (fresh) = 800 kJ / 4200 kJ/m2/year = 0.1905 m2/year
Rice or Rice Cereal = 800 kJ / 5200 kJ/m2/year = 0.1538 m2/year
Apples = 800 kJ / 6300 kJ/m2/year = 0.1270 m2/year
Corn Cereal = 800 kJ / 6700 kJ/m2/year = 0.1194 m2/year
Potatoes = 800 kJ / 6700 kJ/m2/year = 0.1194 m2/year
Beet Sugar = 800 kJ / 8300 kJ/m2/year = 0.09639 m2/year
Cane Sugar = 800 kJ / 14650 kJ/m2/year = 0.05461 m2/year
What Did You Discover?
1:
Ratio of Producers / Consumers = 5611.66... kJ/m2/year / 799.66... kJ/m2/year = 7.0175 to 1
2:
Vary a lot.
3:
Plant products
Where they are grown
Length of growing season
Get more energy out of 1 m2 of land than you do for consumers
Extension
4:
Rice = 5200 kJ/m2/year
Chicken = 800 kJ/m2/year
1 person = 2400 kJ/day/person * 365 days/year = 876000 kJ/year/person
Total land required for each:
Rice = 876000 kJ/year/person / 5200 kJ/m2/year = 168.46 m2 / person
Chicken = 876000 kJ/year /person / 800 kJ/m2/year = 1095 m2 / person
Assuming a population of 800 students:
Rice = 800 persons / school * 168.46 m2 / person = 134768 m2 / school
Chicken = 800 persons / school * 1095 m2 / person = 876000 m2 / school