Biology 2483A Lecture 24: Bio 2483 Lecture 24
14 Jan 2019
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Document Summary
Flux: rate of movement of an element between pools: examples: terrestrial plants are a pool of carbon; photosynthesis represents a flux, the carbon cycle: C is critical for energy transfer and the construction of biomass. Marine biota has little c bc there is high turnover rate. Biggest c pools are in rocks highlight 1, 5 and 7. 99% of c is tied up in rocks forests are one of our largest pools of c. Ch4 and in rumens of ruminant animals: anthropogenic sources of methane ch4 include, burning fossil fuels, agricultural development (primarily rice grown in flooded fields, burning of forests and crops. Livestock production e. g. , cattle for beef: over geologic time, atmospheric c concentrations have changed with geological and climatic changes. Concentrations have ranged from >3,000 ppm 60 million years ago to <200 ppm 140,000 years ago. Since the mid-19th century, co2 the past 400,000 years.
