ENVI 101 Lecture Notes - Lecture 6: Natural Filtration, Transpiration, Nitrogen Fixation
13 Sep 2016
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Document Summary
If all of the grain currently fed to livestock in the united states were consumed directly by people, the number of people who could be fed would be nearly 900 million. Greener areas (hotter spots) have more productivity. The rate at which producers use photosynthesis to produce and store chemical energy minus the rate at which they use some of this stored chemical energy through aerobic respiration. Ultimately limits the number of consumers (including humans) that can survive on the earth. Humans use, waste, or destroy about 38% of the earth"s potential npp (the human pop. makes up less than 1% of the total biomass) 3 major processes: evaporation, precipitation & transpiration. Primary sculptor of earth"s landscape ii. 1. glaciation forming lakes iii. Water running through soil and washing away impurities: carbon cycle. How do humans alter the carbon cycle i. ii. Long term carbon storage in limestone or dolomite sediment turn into fossil fuels: nitrogen cycle.
